MEASUREMENT DEVICE FOR EYEGLASSES-WEARING PARAMETER, MEASUREMENT PROGRAM FOR EYEGLASSES-WEARING PARAMETER, AND POSITION DESIGNATION METHOD |
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| 申请号 | EP16761828.9 | 申请日 | 2016-03-10 | 公开(公告)号 | EP3270099A1 | 公开(公告)日 | 2018-01-17 |
| 申请人 | Hoya Lens Thailand Ltd.; | 发明人 | TADOKORO Nobuyuki; HIRONO Naoya; MATSUSHIMA Masaaki; | ||||
| 摘要 | A spectacle wearing parameter measurement device 1 used in measurement of a spectacle wearing parameter of a subject who is to wear a spectacle frame, the spectacle wearing parameter measurement device includes: an information processing unit 15 that acquires each of a first image as a face image of the subject in a spectacle-frame wearing state and a second image as a face image in a spectacle-frame non-wearing state and prepares a third image obtained by associating the first image and the second image; a display screen unit 12 that displays the third image prepared by the information processing unit 15; an operation unit 12a that specifies a measurement reference point of the spectacle wearing parameter on the third image displayed on the display screen unit 12; and a measurement computation section 15e that calculates the spectacle wearing parameter by using data of the specified measurement reference point. | ||||||
| 权利要求 | |||||||
| 说明书全文 | The present invention relates to a spectacle wearing parameter measurement device, a spectacle wearing parameter measurement program, and a position specifying method used when spectacle wearing parameters are to be measured. Generally, for preparing spectacle lenses, spectacle wearing parameters measured in a state in which a spectacle wearer is wearing a spectacle frame are required. As the spectacle wearing parameters, a corneal vertex distance, a frame forward-tilt angle, a fitting-point position, an interpupillary distance, a frame warp angle, etc. are known. Measurement of the spectacle wearing parameters is performed by using a dedicated measuring device. Examples of the dedicated measuring device include a device configured to image the face of a subject in a spectacle-frame wearing state and compute and obtain various spectacle wearing parameters based on the face images, which are imaging results thereof (for example, see Patent Literature 1). Specifically, in the measuring device disclosed in Patent Literature 1, the imaging result of the face of the subject is displayed on a screen, a point serving as a reference for measurement (for example, a corneal vertex of the subject, a spectacle-frame front frame, or the like) is specified while a cursor mark or the like is utilized on the screen, and, then, the spectacle wearing parameters such as the corneal vertex distance and the frame forward-tilt angle are computed and obtained based on the position of the measurement reference point on the screen (for example, see the description of paragraphs "0033" to "0035" of Patent Literature 1). Meanwhile, in order to change the relative positions between the eye position of a spectacle wearer and a spectacle lens, a deformation mechanism is sometimes provided for temples of the spectacle frame. In that case, the temple width is widened with respect to the spectacle frame (for example, see
As described above, the measurement of the spectacle wearing parameters is performed based on the position of the measurement reference point on the screen. In other words, the specifying of the position of the measurement reference point on the screen displaying the face image of the subject is essential processing for measuring the spectacle wearing parameters. Therefore, the specifying of the position of the measurement reference point is desired to be easily performed. In addition, since the position of the measurement reference point directly affects the measurement results of the spectacle wearing parameters, the specifying thereof is required to be performed with high accuracy. For example, in a case in which the corneal vertex distance is to be measured, the position of the measurement reference point is required to properly match, for example, the corneal vertex of the subject. However, with the conventional technique, it is not always possible to specify the position of the measurement reference point simply and highly accurately for the reasons described below. The position of the measurement reference point is specified on the screen displaying the face image of the subject. For example, in a case in which the corneal vertex distance is to be measured as the spectacle wearing parameter, the position of the corneal vertex of the subject is specified as one of the measurement reference point on the face image obtained by imaging a lateral side of the face of the subject. However, the image used for measurement of the spectacle wearing parameter and for specifying the position of the spectacle wearing parameter therefor is obtained by imaging the face of the subject wearing the spectacle frame. Therefore, depending on the shape of the spectacle frame worn by the subject, a part that is difficult to see with respect to the face of the subject is generated, and the position of the measurement reference point to be specified may become unclear. Specifically, for example, spectacle frames of a plastic-based material include those having a large temple width, and a situation that the corneal vertex of the subject is hidden by the temple of the spectacle frame on the face image may occur. In such a case, there are possibilities that the position of the measurement reference point cannot be easily specified and that necessary and sufficient positional accuracy with respect to the position of the measurement reference point after the specifying cannot be ensured. As described in Patent Literature 2, if a spectacle frame having a large temple width is used, the cornea may be hidden by the spectacle frame so that it is unable to be seen. In such a case, there are possibilities that the position of the measurement reference point cannot be easily specified and that necessary and sufficient positional accuracy with respect to the position of the measurement reference point after the specifying cannot be ensured. Therefore, it may be difficult to measure the distance of the wearing parameters including the corneal vertex. Therefore, in the measurement of the spectacle wearing parameters, it is an object of the present invention to provide, in a case in which the position of a measurement reference point is to be specified on a face image of a subject, a spectacle wearing parameter measurement device, a spectacle wearing parameter measurement program, and a position specifying method which enable to specify the position of the measurement reference point thereof. The present invention has been devised to achieve the above object. A first aspect of the present invention is a spectacle wearing parameter measurement device used in measurement of a spectacle wearing parameter of a subject who is to wear a spectacle frame, the spectacle wearing parameter measurement device having: an information processing unit that acquires each of a first image as a face image of the subject in a spectacle-frame wearing state and a second image as a face image in a spectacle-frame non-wearing state and prepares a third image obtained by associating the first image and the second image; a display screen unit that displays the image prepared by the information processing unit; an operation unit that specifies a measurement reference point of the spectacle wearing parameter on the image displayed on the display screen unit; and a computation unit that calculates the spectacle wearing parameter by using data of the specified measurement reference point. A second aspect of the present invention is the spectacle wearing parameter measurement device according to the first aspect, wherein the third image is a synthetic image obtained by synthesizing the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state and includes at least a measurement position. A third aspect of the present invention is the spectacle wearing parameter measurement device according to the second aspect, wherein the synthetic image is a synthetic image of a partial region of the first image in the spectacle-frame wearing state and a corresponding region of the second image in the spectacle-frame non-wearing state. A fourth aspect of the present invention is the spectacle wearing parameter measurement device according to the third aspect, wherein the partial region is a region including a rim part of the spectacle frame worn by the subject on the first image obtained by imaging a lateral side of the face of the subject; and the corresponding region is a region not including an eyeball corneal part of the subject on the second image obtained by imaging a lateral side of the face of the subject. A fifth aspect of the present invention is a non-transitory computer-readable recording medium storing a spectacle wearing parameter measurement program that causes a computer provided with a display screen unit and an operation unit and used in measurement of a spectacle wearing parameter of a subject who is to wear a spectacle frame to function as:
A sixth aspect of the present invention is a position specifying method for specifying, when a spectacle wearing parameter about a subj ect is to be measured by using a face image of the subject in a wearing state of a spectacle frame, a measurement reference point on the face image required for the measurement; the position specifying method including: acquiring each of a first image as the face image of the subject in a spectacle-frame wearing state and a second image as the face image in a spectacle-frame non-wearing state; when the measurement reference point is to be specified, preparing and displaying a third image obtained by associating the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state; and specifying the measurement reference point of the spectacle wearing parameter on the third image. According to the present invention, in a case in which the position of the measurement reference point is to be specified on the face image of the subject for measurement of the spectacle wearing parameters, the position of the measurement reference point can be specified.
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, description will be given with the following item classification.
First, the outlines of the present invention will be described. The present invention is used for measuring spectacle wearing parameters. More specifically, the face of a subject wearing a spectacle frame is imaged, a face image which is as an imaging result thereof is displayed on a screen, a point (for example, a corneal vertex of the subject, a spectacle-frame front frame, etc.) which is a reference of measurement on the face image is specified, and, then, various spectacle wearing parameters are computed and obtained based on the positions of the measurement reference points, thereby measuring the spectacle wearing parameters. In the present invention, such measurement of the spectacle wearing parameters is performed by using a spectacle wearing parameter measurement device, wherein a device body (housing) is configured to be portable. This is for a reason that, if it is portable, installation space like that of a non-portable large-scale measuring device is not required, and introduction to eyewear shops can be facilitated. The configuration of the portable spectacle wearing parameter measurement device is not particularly limited as long as the device can be carried by hand by a measurer (that is, the examiner for the subject) of the spectacle wearing parameters. For example, it is conceivable to use a portable tablet terminal device which is a computer having an imaging function, an image display function, an operation function, and an information processing function. When the tablet terminal device is used, an imaging function, an image display function, an operation function, and an information processing function necessary and sufficient for measuring the spectacle wearing parameters are obtained, and the tablet terminal devices have been widely spread in recent years. In view of that, the portable spectacle wearing parameter measurement device can be realized at low cost, and it can be said that it is very suitable for promoting introduction to eyewear shops. By the way, for example, a portable tablet terminal device generally adopts a touch interface in which an operator touches and directly operates an operation target. By virtue of this, simple operability can be realized. However, in a case in which such a tablet terminal device is used as a spectacle wearing parameter measurement device, the face image obtained by imaging the face of the subject in a spectacle-frame wearing state is displayed and used as an operation target. Therefore, as already described, it is conceivable that, depending on the shape of the spectacle frame worn by the subject, a part which is difficult to see with respect to the face of the subj ect is generated, and operability is deteriorated by this. Regarding this point, the inventors of the present application have carried out intensive studies. As a result, the inventors of the present application conceived that, if a face image of a subject in a non-wearing state of a spectacle frame is also displayed so that an examiner (operator) can perceive it while displaying a face image of the subject in a wearing state of the spectacle frame, generation of the part which is difficult to see with respect to the face of the subject can be avoided, and deterioration of operability caused by that can be suppressed. In order to realize this, the inventors of the present application further carried out intensive studies. Also, the inventors of the present invention have gotten a completely new idea, which was not present in the past, that a state without a spectacle frame can be easily perceived also at the part which is difficult to see because of the spectacle frame by preparing an imaging result of the face of the subject in a spectacle-frame non-wearing state in addition to an imaging result of the face of the subject in a spectacle-frame wearing state and displaying these imaging results associated with each other in one display screen. The present invention has been accomplished based on the above-described new idea by the inventors of the present application. That is, the present invention is characterized by acquiring each of a face image of a subject in a spectacle-frame wearing state (first image) and a face image in a spectacle-frame non-wearing state (second image); when a measurement reference point to be required for measurement of spectacle wearing parameters is to be specified, generating a (processed) image (third image) in which the face images are associated with each other and displaying the third image in one display screen; and specifying the measurement reference points on the processed image. By having such a characteristic, in a case in which the position of the measurement reference point is to be specified on the face image of the subject for measurement of the spectacle wearing parameters, specifying of the position of the measurement reference points can be realized. Here, the spectacle wearing parameters measured by using the spectacle wearing parameter measurement device will be described. As the spectacle wearing parameters, for example, a corneal vertex distance and a frame forward-tilt angle in a state in which a subject is wearing a spectacle frame are known. As shown in However, the spectacle lens L framed in the spectacle frame F has a different curvature of the inner surface depending on the spherical power, astigmatism power, etc. prescribed for the subject. On the other hand, measurement of the spectacle wearing parameters is generally performed at the timing when the subject is to newly purchase glasses, in other words, in a state in which the subject is wearing a spectacle frame in which sample lenses are framed in at an eyewear shop. Therefore, even if the corneal vertex distance CVD is measured at the eyewear shop, the measurement result thereof does not necessarily reflect the prescribed power, etc. of the subject. In addition, in the state of being framed in the spectacle frame F, the position of the inner surface of the spectacle lens L is often difficult to see. Therefore, in the present embodiment, instead of the corneal vertex distance CVD, a frame corneal-vertex distance FVD is measured as the spectacle wearing parameter. As shown in If the spectacle frame F is rimless, the distance to the intersection point with the straight line connecting the upper end of a dummy lens attached to the spectacle frame F and the midpoint of the width of the lower edge is the corneal-vertex frame distance. Further, if the spectacle frame F is that of a semi-rimless glasses, the distance to the intersection point with the straight line connecting the center of the width of a rim bar or the center of the width of a blow bar and the midpoint of the width of the lower edge of a dummy lens is the corneal-vertex frame distance. Note that, if the prescribed power, etc. of the spectacle lens L are determined, the corneal vertex distance CVD to which the prescribed power, etc. are reflected can be uniquely derived by performing geometric calculations, etc. based on the measurement result of the frame corneal-vertex distance FVD while using the refractive index of a lens base material, a lens convex-surface curve shape, a lens concave surface curve shape, a lens thickness, a frame forward-tilt angle, a frame warp angle, a lens forward-tilt angle, an eyepoint, and the position of a lens ridge as calculation parameters. The frame forward-tilt angle generally refers to the angle formed by the rim and a temple of the spectacle frame F. However, in the present embodiment, as shown in These spectacle wearing parameters are merely specific examples. In other words, the spectacle wearing parameters are not limited to these, but are only required to include at least one of these and may include other things. Examples of the other things include a fitting point position, an interpupillary distance, a frame warp angle, a near-vision interpupillary distance, an eyeball torsion angle, etc. In the present embodiment, a case in which the frame corneal-vertex distance FVD and the frame forward-tilt angle α are measured as the spectacle wearing parameters is exemplified and described in detail below. Next, a configuration example of the spectacle wearing parameter measurement device used for measuring the spectacle wearing parameters will be described. As shown in The tablet terminal 1 is provided with a portable device housing (body) 10 that can be carried by hand by a measurer of the spectacle wearing parameters (that is, an examiner for the subject). The device housing 10 is provided with: an imaging camera unit 11 including a charge coupled device (CCD) sensor or a complementary metal-oxide semiconductor (CMOS) sensor, a display screen unit 12 including a flat panel display such as a liquid crystal display (LCD) panel, and an information processing unit 15 (however, not shown in In addition, as shown in The gyro sensor 13 is used for perceiving the orientation state, etc. of the device housing 10. It should be noted that the one that is originally provided in the tablet terminal 1 may be utilized as the gyro sensor 13. In the memory unit 14, in addition to the image data obtained by the imaging camera unit 11 and the various data input by the operation unit 12a, a predetermined program required for the processing operation of the information processing unit 15 is stored. When the predetermined program is read and executed from the memory unit 14, the information processing unit 15 functions as an imaging control section 15a, an image processing section 15b, a display control section 15c, an operation control section 15d, and a measurement computation section 15e. The imaging control section 15a controls the operation of the imaging camera unit 11. The operation control of the imaging camera unit 11 includes controlling whether a shutter is to be operated or not in the imaging camera unit 11. More specifically, the imaging control section 15a permits operation of the shutter only when the orientation of the device housing 10 is in a predetermined state. Regarding face images of a subject which are imaging results obtained by the imaging camera unit 11, the image processing section 15b performs predetermined image processes on the face images. Specifically, as one of the predetermined image processes, with respect to a first image in a spectacle-frame wearing state of the subject obtained by the imaging camera unit 11 and a second image thereof in a spectacle-frame non-wearing state, the image processing section 15b generates a processed image (third image) associating them. More specifically, as a processed image in which the images are associated, a synthetic image obtained by synthesizing the images is generated. The synthetic image is obtained by performing so-called superimpose synthesis in which, in a partial region of the second image in the spectacle-frame non-wearing state of the subject, the corresponding region of the first image in the spectacle-frame wearing state of the same subject is embedded (both of the regions are synthesized with each other). Examples of the partial region and the corresponding region serving as the targets of the superimpose synthesis include, as described in detail later, a region including an eyeball corneal part of the subject on a face lateral-side image obtained by imaging a lateral side of the face of the subject. That is, in the above example, the synthetic image includes at least a measurement position. The display control section 15c performs operation control of the display screen unit 12. The operation control of the display screen unit 12 includes control about image contents displayed on the display screen unit 12. Specifically, the display control section 15c causes the display screen unit 12 to display a face image (that is, an image before imaging) of the subject serving as an imaging target by the imaging camera unit 11, thereby causing the display screen unit 12 to function as an imaging finder of the imaging camera unit 11. Furthermore, the display control section 15c causes the display screen unit 12 to perform image display of a face image of the subject (that is, an image obtained by imaging) that is an imaging result of the imaging camera unit 11, thereby subjecting it to the operation by the operation unit 12a to be performed thereafter. At this point of time, as an imaging result by the imaging camera unit 11, the display control section 15c performs image display of the processed image (specifically, for example, superimposed synthetic image), which is generated by the image processing section 15b, by the display screen unit 12. The operation control section 15d performs operation control of the operation unit 12a. The operation control of the operation unit 12a includes the position recognition of the point specified by the operation unit 12a. Specifically, the operation control section 15d causes the operation unit 12a to specify a point on the face image of the subject displayed on the display screen unit 12, thereby recognizing the position of a measurement reference point, which is necessary for measuring the spectacle wearing parameters, on the displayed image. The measurement computation section 15e is for obtaining the spectacle wearing parameters about the subject. Specifically, while using the imaging result obtained by the imaging camera unit 11, the measurement computation section 15e performs computation processing of obtaining the spectacle wearing parameters about the subject based on the measurement reference point specified by the operation unit 12a. In the present embodiment, the measurement computation section 15e is also referred to as a computation unit. Each of these sections 15a to 15e is realized by reading and executing the predetermined program in the memory unit 14 by the information processing unit 15. That is, the functions as the sections 15a to 15e in the tablet terminal 1 are realized by the predetermined program in the memory unit 14 (that is, one embodiment of a spectacle wearing parameter measurement program according to the present invention). In that case, the spectacle wearing parameter measurement program is installed and used in the memory unit 14. However, before the installation, the program may be stored and provided in a storage medium readable by the tablet terminal 1 or may be provided to the tablet terminal 1 through a communication line connected to the tablet terminal 1. In the present embodiment, the case in which the information processing unit 15 in the device housing 10 functions as the measurement computation section 15e, in other words, the case in which the measurement computation section 15e performs computation processing for obtaining the spectacle wearing parameters in the device housing 10 has been taken as an example. However, for example, if the information processing unit 15 is configured to be able to communicate with a second device on a communication line through the communication line, which is wireless or wired and is connected to the tablet terminal 1, the second device may be configured to have the function of performing computation processing for obtaining the spectacle wearing parameters. That is, the device housing 10 of the tablet terminal 1 is only required to be provided with at least the imaging camera unit 11, the display screen unit 12, and the operation unit 12a, and the function, etc. as the measurement computation section 15e by the information processing unit 15 may be replaced by a second device on a communication line like so-called cloud computing. Next, procedures of a spectacle wearing parameter measurement method performed by using the tablet terminal 1 having the above-described configuration will be described. Herein, first, the outline of the procedures of the spectacle wearing parameter measurement method will be described. In the spectacle wearing parameter measurement method described in the present embodiment, at least a lateral side of the face of the subject in a spectacle-frame wearing state and a lateral side of the face of the subj ect in a spectacle-frame non-wearing state are imaged, and the frame corneal-vertex distance FVD and the frame forward-tilt angle α are obtained based on the first image (the face image in the spectacle-frame wearing state) and the second image (the face image in the spectacle-frame non-wearing state), which are the imaging results thereof, thereby performing measurement about the spectacle wearing parameters. Specifically, a measurer of the spectacle wearing parameters (that is, an examiner such as a shop clerk of an eyewear shop) causes a subject of the spectacle wearing parameters (that is, a customer of the eyewear shop or the like) to be prepared for imaging and starts up the tablet terminal 1 in which the spectacle wearing parameter measurement program is installed as an application program (step 101, hereinafter, step will be abbreviated as "S"). At this point of time, the subject prepares a spectacle frame to be worn. Since the portable tablet terminal 1 is used for the imaging of the subject, unlike a case in which a fixed measuring device is used, there is no need to move the subject to an installation site of the device or to cause the subject to take a particular orientation. Up to this point corresponds to the "preparation phase" in the spectacle wearing parameter measurement method of the present embodiment. After the preparation phase, while the examiner is using the imaging camera unit 11 of the tablet terminal 1 in a state in which the examiner is holding the tablet terminal 1 in his or her hand, the examiner presses a shutter button of the imaging camera unit 11, thereby imaging a lateral side of the face of the subject in the spectacle-frame wearing state (S102) and then imaging the lateral side of the face in the spectacle-frame non-wearing state (S103). As a result, the tablet terminal 1 acquires at least each of the image of the lateral side of the face of the subject in the spectacle-frame wearing state and the image of the lateral side of the face of the subject in the spectacle-frame non-wearing state. Up to this point corresponds to an "imaging phase" in the spectacle wearing parameter measurement method of the present embodiment. After the imaging phase, the examiner operates the tablet terminal 1 and, at the same time, measures various spectacle wearing parameters based on the imaging result obtained in the imaging phase. Specifically, the tablet terminal 1 obtains, at least, the frame forward-tilt angle α (S104), performs measurement of a frame vertical width of the spectacle frame worn by the subject (S105), and, then, obtains the frame corneal-vertex distance FVD (S106). Up to this point corresponds to a "measurement phase" in the spectacle wearing parameter measurement method of the present embodiment. Then, the tablet terminal 1 saves the measurement results of the various spectacle wearing parameters obtained in this manner, for example, in the memory unit 14 (S107). In this manner, in the spectacle wearing parameter measurement method described in the present embodiment, in a rough classification, the measurement about the spectacle wearing parameters is performed through the preparation phase, the imaging phase, and the measurement phase. It should be noted that the phases are not necessarily performed in this order, and they may be performed concurrently in parallel. Specifically, for example, after the first image of the subject in the spectacle-frame wearing state is acquired in the imaging phase (S102), the measurement phase may be started to obtain the frame forward-tilt angle α (S104) before the second image in the spectacle-frame non-wearing state is acquired (S102). Subsequently, characteristic procedures in the spectacle wearing parameter measurement method that is subjected to the above phases will be described in detail with reference to specific examples. When the first image of the subject in the spectacle-frame wearing state is to be obtained by imaging, the tablet terminal 1 first becomes an imaging mode for the spectacle-frame wearing state in response to a predetermined operation by the examiner who performs the imaging. The tablet terminal 1 which has become the imaging mode for the spectacle-frame wearing state follows control by the display control section 15c; and, at the same time, as shown in The first reference lines 31 are displayed so as to always extend in the vertical direction and the horizontal direction regardless of the state of the orientation of the device housing 10 of the tablet terminal 1. In other words, the first reference lines 31 are always fixedly displayed with respect to the gravity direction regardless of the orientation of the device housing 10. The first reference lines 31 like this can be displayed in the imaging finder by utilizing the function of the gyro sensor 13. On the other hand, the second reference line 32 is always fixedly displayed with respect to a field angle of the display screen unit 12. Therefore, when the orientation of the device housing 10 of the tablet terminal 1 is changed, the extending direction of the second reference line 32 is also changed in response to that. Note that, the first reference lines 31 and the second reference line 32 are displayed so that each of them can be distinguished from one another. Specifically, it is conceivable to make them distinguishable by using different display colors, respectively. The shutter button 33 is pressed by the examiner to perform imaging by the imaging camera unit 11. However, as shown in When the first reference lines 31, the second reference line 32, and the shutter button 33 are displayed in the imaging finder, the examiner sets a lateral side of the face of the subject in the spectacle-frame wearing state as an imaging target of the imaging camera unit 11. Specifically, the examiner causes the subject to wear the spectacle frame, then holds the tablet terminal 1 by hand so as to be opposed to the lateral side of the face of the subject in the spectacle-frame wearing state, and displays the lateral side of the face of the subject in the imaging finder of the display screen unit 12 of the tablet terminal 1. Then, as shown in If the shutter button 33 becomes the pressable state in the state in which the second reference line 32 is matching the rim center line, the examiner presses the shutter button 33 in this state. When the shutter button 33 is pressed, in the tablet terminal 1, the imaging camera unit 11 images the image in the state in which it is displayed in the imaging finder. The image which is an imaging result of the imaging camera unit 11 (in other words, the image of the lateral side of the face of the subject in the spectacle-frame wearing state) is once displayed on the display screen unit 12 together with the position information of the first reference lines 31 and the second reference line 32 on the image. Herein, the display control section 15c may move the position of the second reference line 32 on the screen displayed on the display screen unit 12 while following the operation contents of the operation unit 12a by the examiner. As a result of this, even after the imaging of the lateral side of the face of the subject in the spectacle-frame wearing state, the position of the second reference line 32 on the image, which is the imaging result thereof, can be finely adjusted by the examiner. Then, there is no problem as a result of a check by the examiner, the display contents by the display screen unit 12 is subjected to data saving in the memory unit 14 as the imaging result of the first image of the subject in the spectacle-frame wearing state. As described above, in the imaging of the first image of the subject in the spectacle-frame wearing state, the tablet terminal 1 described in the present embodiment performs the imaging so that the second reference line 32 displayed in the imaging finder matches the rim center line of the spectacle frame F worn by the subject. When imaging is performed in this manner, as details are described later, the frame forward-tilt angle α, which is one of the spectacle wearing parameters, can be obtained by utilizing the position relation of the first reference lines 31 and the second reference line 32. Note that, the first image of the subject in the spectacle-frame wearing state obtained by the imaging can be displayed and reused by the display screen unit 12 of the tablet terminal 1 by reading the first image from the memory unit 14 after the first image is subjected to data saving into the memory unit 14. In that case, the display control section 15c, which causes the display screen unit 12 to display the image, may cause the image processing section 15b to perform an image editing process of moving the first image in the rotation direction so that the position of the second reference line 32 is overlapped with the position of the first reference line 31. Through such an image editing process, the display screen unit 12 displays the first image of the subject, which is in the spectacle-frame wearing state, in the state in which the position adjustment amount of the movement of the tablet terminal 1 in the rotation direction in the imaging is corrected (in other words, in the state in which the vertical direction and the horizontal direction of the first image are along the end sides constituting the field angle of the display screen unit 12). When the imaging of the first image of the subject in the spectacle-frame wearing state is finished, the tablet terminal 1 then becomes an imaging mode for the spectacle-frame non-wearing state of the subject in response to a predetermined operation by the examiner. While following control by the display control section 15c, at the same time, the tablet terminal 1, which has become the imaging mode for the spectacle-frame non-wearing state, as shown in The guide image 34 is an image obtained by subjecting the imaging result, which is obtained in the imaging process of the first image in the spectacle-frame wearing state (S102), to a predetermined image editing process by the image processing section 15b. Other than the above-described image editing process of correcting the position adjustment amount, the predetermined image editing processes include an image editing process of adjusting the transparency of the image so that the image becomes semi-transparent. The adjustment of the transparency of the image may be performed by utilizing publicly known techniques. However, specifically, it is conceivable to adjust the transparency within a range of 20% to 40%, preferably about 30%. When the transparency is adjusted in this manner, even in the state in which the guide image 34 is displayed, another image can be seen through the guide image. When the shutter button 33 and the guide image 34 are displayed in the imaging finder, the examiner sets the lateral side of the face of the subject in the spectacle-frame non-wearing state as an imaging target of the imaging camera unit 11. Specifically, the examiner causes the subject to take off the spectacle frame, which has been worn by the subject, then holds the tablet terminal 1 by hand so as to be opposed to the lateral side of the face of the subject in the spectacle-frame non-wearing state, and displays the lateral side of the face of the subject in the imaging finder of the display screen unit 12 of the tablet terminal 1. Then, as shown in If the shutter button 33 becomes the pressable state in the state in which the outline of the second image in the spectacle-frame non-wearing state matches the guide image 34, the examiner presses the shutter button 33 in this state. When the shutter button 33 is pressed, in the tablet terminal 1, the imaging camera unit 11 images the image in the state in which it is displayed in the imaging finder. The image which is the imaging result of the imaging camera unit 11 (in other words, the image of the lateral side of the face of the subject in the spectacle-frame non-wearing state) is once displayed on the display screen unit 12 together with the guide image 34. Herein, while following the operation contents of the operation unit 12a by the examiner, regarding the image which is the imaging result of the imaging camera unit 11, the display control section 15c may move the position thereof or expand/reduce the size thereof on the screen displayed on the display screen unit 12. As a result of this, even after the imaging of the lateral side of the face of the subject in the spectacle-frame non-wearing state, the second image can be finely adjusted by the examiner so that the outline of the second image, which is the imaging result thereof, completely matches the guide image 34. Then, there is no problem as a result of a check by the examiner, the display contents by the display screen unit 12 are subjected to data saving in the memory unit 14 as the imaging result of the second image of the subject in the spectacle-frame non-wearing state. As described above, in the imaging of the second image of the subject in the spectacle-frame non-wearing state, the tablet terminal 1 described in the present embodiment performs the imaging so that the image matches the guide image 34, which is based on the imaging result of the first image of the subject in the spectacle-frame wearing state. When the imaging is performed in this manner, as the second image of the subject in the spectacle-frame non-wearing state, an image having approximately the same location, size, etc. of the image in the field angle as the already-obtained first image of the subject in the spectacle-frame wearing state. Note that, the second image of the subject in the spectacle-frame non-wearing state obtained by the imaging can be displayed and reused by the display screen unit 12 of the tablet terminal 1 by reading the second image from the memory unit 14 after the second image is subjected to data saving into the memory unit 14. After the imaging process of the first image of the subject in the spectacle-frame wearing state (S102) is finished, a measuring process of the frame forward-tilt angle α (S104) can be started. When the frame forward-tilt angle α is to be measured, the tablet terminal 1 becomes a forward-tilt-angle measuring mode in response to a predetermined operation by the examiner. While following the control by the display control section 15c, the tablet terminal 1 which has become the forward-tilt-angle measuring mode reads the first image of the subject in the spectacle-frame wearing state from the memory unit 14 and displays the first image by the display screen unit 12. Then, in the tablet terminal 1, while using the first image of the spectacle-frame wearing state, the measurement computation section 15e performs a computation process of obtaining the frame forward-tilt angle α. Specifically, according to the first image in the spectacle-frame wearing state read from the memory unit 14, the positions of the first reference lines 31 and the second reference line 32 on the image can be specified; therefore, the measurement computation section 15e considers the vertical-direction straight line of the first reference lines 31 as a straight line L1 (see The frame forward-tilt angle α obtained by the measurement computation section 15e in this manner is displayed in a predetermined window in the screen of the display screen unit 12 while following the control by the display control section 15c. Then, if there is no problem as a result of a check by the examiner, the result of the computation process is subjected to data saving into the memory unit 14. Meanwhile, in the measurement phase, the spectacle wearing parameters are computed and obtained based on the face images, which are the imaging results of the face of the subject. Therefore, for example, regarding the spectacle wearing parameter specified by the magnitude of the distance such as the frame corneal-vertex distance FVD, when it is to be obtained by computing, calibration (calibration) of associating the magnitude of the distance on the face image and the magnitude of the actual distance in real space is required. For this calibration, in the present embodiment, the measuring process (S105) of the spectacle-frame vertical width about the spectacle frame F worn by the subject is performed. When the measuring process of the spectacle-frame vertical width (S105) is to be performed, the tablet terminal 1 becomes a spectacle-frame vertical-width measuring mode. While following the control by the display control section 15c, as shown in The third reference line 35 is fixedly displayed in the vicinity of an intermediate point in a top-bottom direction of the screen of the display screen unit 12. The display of the third reference line 35 is not essential, and the display may be omitted. On the other hand, the fourth reference lines 36a and 36b are displayed so as to sandwich the third reference line 35. Moreover, each of the fourth reference lines 36a and 36b can be independently moved in the screen while the parallel state with the third reference line 35 is maintained. The movement of the fourth reference lines 36a and 36b in the screen is performed while following the operation contents of the operation unit 12a by the examiner. When the third reference line 35 and the fourth reference lines 36a and 36b are displayed in the screen of the display screen unit 12, as shown in Subsequently after the spectacle frame F is placed on the screen of the display screen unit 12, the examiner moves the fourth reference lines 36a and 36b in the screen by operating the operation unit 12a. Then, one of the fourth reference lines 36a is caused to match a rim upper end of the spectacle frame F, and the other fourth reference line 36b is caused to match a rim lower end of the spectacle frame F. As a result of this, the interval between the fourth reference lines 36a and 36b matches the magnitude of the frame vertical width of the spectacle frame F. If a predetermined operation (for example, pressing of an icon image of "determined" which is not shown in the view) by the operation unit 12a is performed in this state, in the tablet terminal 1, the measurement computation section 15e obtains the actual distance between the fourth reference lines 36a and 36b. Specifically, the measurement computation section 15e recognizes the magnitude of the interval between the fourth reference lines 36a and 36b by the number of pixels in the display screen unit 12, obtains the actual distance between the fourth reference lines 36a and 36b by multiplying the recognized number of pixels by the actual magnitude per one pixel, and uses the result of the computation process as the magnitude of the frame vertical width of the spectacle frame F. The result of the computation process of the frame vertical width obtained by the measurement computation section 15e in this manner is displayed in a predetermined window 37 in the screen of the display screen unit 12 while following the control by the display control section 15c. Then, if there is no problem as a result of a check by the examiner, the result of the computation process is subjected to data saving into the memory unit 14. In this manner, for the calibration required in the measurement of the spectacle wearing parameters, the tablet terminal 1 described in the present embodiment performs the measuring process (S105) of the spectacle-frame vertical width about the spectacle frame F worn by the subject. Moreover, in the measuring process of the spectacle-frame vertical width (S105), the tablet terminal 1 of the present embodiment converts the magnitude of the frame vertical width of the spectacle frame F to the number of pixels in the display screen unit 12 in the state in which the spectacle frame F is placed on the screen of the display screen unit 12 and then obtains the magnitude of the frame vertical width by a computation process. Therefore, the magnitude of the frame vertical width of the spectacle frame F is not required to be physically measured by a scale or the like, the value of the measurement result thereof is not required to be input to the tablet terminal 1, and the measuring process of the spectacle-frame vertical width (S105) can be easily performed by utilizing the display screen unit 12 of the tablet terminal 1. In addition, there is no need to attach a jig or the like serving as a scale to the spectacle frame F in advance for the calibration required for the measurement of the spectacle wearing parameters. In other words, the series of processes can be completely performed only by the tablet terminal 1, and this is extremely suitable for forming the spectacle wearing parameter measurement device by using the tablet terminal 1. After the spectacle wearing parameter measurement device as described above is completed, the measuring process of the frame corneal-vertex distance FVD (S106) can be executed in the tablet terminal 1. When the frame corneal-vertex distance FVD is to be measured, the tablet terminal 1 becomes a frame-corneal-vertex-distance measuring mode in response to a predetermined operation by the examiner. While following the control by the display control section 15c, the tablet terminal 1, which has become the frame-corneal-vertex-distance measuring mode, reads the imaging results obtained in the imaging processes (S102, S103) from the memory unit 14, displays the imaging results by the display screen unit 12, and subjects them to the operations of the operation unit 12a to be performed by the examiner thereafter. However, at this point, in the tablet terminal 1, the function as the image processing section 15b in the information processing unit 15 performs image processing as described below. As shown in After the first image 41 in the spectacle-frame wearing state and the second image 42 in the spectacle-frame non-wearing state are read, the image processing section 15b subjects these images 41 and 42 to the image processing required for performing superimpose synthesis. Specifically, as shown in Moreover, as shown in It is conceivable that the association between the partial region 43 and the corresponding region 44 is performed based on the position information of the pixels constituting the images 41 and 42. This is for a reason that the first image 41 in the spectacle-frame wearing state and the second image 42 in the spectacle-frame non-wearing state are obtained by imaging so as to have the same view angle and that the location, size, etc. of the image in the field angle are approximately the same except for the presence/absence of the wearing of the spectacle frame. However, the association is not necessarily limited to this, and the partial region 43 and the corresponding region 44 may be associated with each other by another method. Examples of other methods include: subjecting image elements (for example, the ear of the subject, the rim of the spectacle frame) commonly present in the images 41 and 42 to shape recognition, causing the image elements thereof to match each other, and, then, associating the partial region 43 and the corresponding region 44 with each other with high precision based on the position relation with the image elements. Then, as shown in In the single synthetic image 45 obtained by such superimpose synthesis, the partial region 43 in the first image 41 in the spectacle-frame wearing state is replaced by the corresponding region 44 in the second image 42 in the spectacle-frame non-wearing state. Therefore, when such superimpose synthesis is performed, on the single synthetic image 45 obtained as a result thereof, the image part of the spectacle frame is partially deleted in accordance with needs from the synthetic image. After the image synthesizing process as described above is performed, in the tablet terminal 1, the single synthetic image 45 obtained by the image synthesizing process is displayed on the display screen unit 12, and, then, the examiner is caused to specify the measurement reference points which are required to measure the frame corneal-vertex distance FVD. Specifically, while following the control by the display control section 15c, as shown in The pointer images 53 and 54 are graphic images which serve as indicators of the position specifying of the points to be specified by the operation unit 12a when specifying of the measurement reference points performed by operating the operation unit 12a is to be performed. Among these, the pointer image 53 is used to specify the position of the corneal vertex in the lateral side of the face of the subject as the measurement reference point. Meanwhile, the pointer images 54 are used when an upper end position and a lower end position of the rim of the spectacle frame F worn by the subject are to be specified as the measurement reference points. The graphic pattern shapes constituting these pointer images 53 and 54 are not particularly limited as long as they are set in advance in consideration of the operability by the examiner and the visibility of the synthetic image 45 to be overlapped. After the pointer image 53 and 54 are displayed in an overlapped manner on the synthetic image 45, in the tablet terminal 1, as shown in Furthermore, in the tablet terminal 1, as shown in If there is a predetermined operation (for example, pressing of an icon image of "determine") by the operation unit 12a in this state, in the tablet terminal 1, a center point of the pointer image 53 disposed at the position of the corneal vertex is specified as one of the measurement reference points for obtaining the frame corneal-vertex distance FVD, and center points of the pointer images 54 disposed at the upper end and the lower end of the rim of the spectacle frame F are specified as the rest of the measurement reference points for obtaining the frame corneal-vertex distance FVD. At this point, as shown in When the examiner moves the pointer images 53 and 54 to the respective positions so as to specify the measurement reference points for obtaining the frame corneal-vertex distance FVD, the measurement computation section 15e obtains the intersection point of the straight line extending in the horizontal direction passing through the center of the pointer image 53 positioned at the corneal vertex and the straight line connecting the centers of the pointer images 54 at the upper end and the lower end of the rim of the spectacle frame F. Then, the measurement computation section 15e obtains the distance between the intersection point and the center of the pointer image 53 positioned at the corneal vertex as the frame corneal-vertex distance FVD. The measurement of the frame corneal-vertex distance FVD in this case is performed on the synthetic image 45 displayed on the display screen unit 12. Therefore, in the measurement of the frame corneal-vertex distance FVD, calibration (calibration) of associating the magnitude in the real space and the magnitude on the synthetic image 45 is required. Since the magnitude of the frame vertical width of the spectacle frame F has been obtained in the above-described measuring process (S105) of the spectacle-frame vertical width, for example, it is conceivable to perform the calibration by associating the result of the computation process of the frame vertical width with the distance between the pointer images 54 disposed at the upper end and the lower end of the rim of the spectacle frame F on the synthetic image 45. The frame corneal-vertex distance FVD obtained by the measurement computation section 15e in this manner is displayed in a predetermined window 56 in the screen of the display screen unit 12 while following the control by the display control section 15c. Then, if there is no problem as a result of a check by the examiner, the result of the computation process is subjected to data saving into the memory unit 14. The characteristic procedures in the measurement of the spectacle wearing parameters in the present embodiment have been described above. However, the tablet terminal 1 may perform other procedures other than the above-described characteristic procedures. Examples of the other procedures include: an imaging process of an upper side of the face of the subject and an imaging process of a front side of the face in the imaging phase, a measuring process of a frame warp angle β in the measuring phase, a measuring process of a fitting-point position FP, and a measuring process of an interpupillary distance PD. Note that, since these procedures may be performed by utilizing publicly known techniques, the detailed description thereof is abbreviated herein. According to the tablet terminal 1 described in the present embodiment, the spectacle wearing parameter measurement program for realizing the characteristic functions of the tablet terminal 1, and the position specifying method performed by using the tablet terminal 1, following effects are obtained. According to the present embodiment, the measurement of the various spectacle wearing parameters is performed by utilizing the portable tablet terminal 1. Therefore, installation space like that of a non-portable large-scale measuring device is not required, and introduction to eyewear shops can be facilitated. In this respect, the usability thereof is excellent for the examiner (for example, a clerk of an eyewear shop) who performs the measurement of the various spectacle wearing parameters. Moreover, in the present embodiment, each of the first image of the subject in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state is obtained by imaging, the imaging result about the spectacle-frame wearing state and the imaging result about the spectacle-frame non-wearing state are synthesized and displayed in a single synthetic image, and the measurement reference points required for obtaining the spectacle wearing parameters are specified on the single synthetic image (third image). In other words, in addition to the imaging result of the face image of the subject in the spectacle-frame wearing state, the imaging result of the face image of the subject in the spectacle-frame non-wearing state is prepared, and these imaging results are partially subjected to an image synthesizing process and are displayed as a single synthetic image by the display screen unit 12. Therefore, according to the present embodiment, through the above-described image synthesizing process, the image part of the spectacle frame can be partially deleted in accordance with needs on the single synthetic image after the image synthesizing process. If the image part of the spectacle frame can be partially deleted in this manner, regardless of the shape of the spectacle frame worn by the subject, a situation that it is difficult to see the face of the subject due to the shape of the spectacle frame can be prevented. For example, even if the subject is wearing a spectacle frame having a large temple width, the corneal vertex of the subject can be prevented from being hidden by the temple of the spectacle frame on the face image by deleting the temple part. In other words, according to the present embodiment, when the measurement reference points required for obtaining the spectacle wearing parameters are to be specified, the image part of the spectacle frame is partially deleted in accordance with needs. As a result, obscuring of the positions of the measurement reference points to be specified can be avoided, specifying of the positions of the measurement reference points as a result thereof can be easily performed, and, furthermore, necessary and sufficient position accuracy can be ensured for the specified positions of the measurement reference points. Particularly, as described in the present embodiment, in the image synthesizing process to the single synthetic image, the partial region of the imaging result about the spectacle-frame wearing state is subjected to the superimpose synthesis of embedding the imaging result about the spectacle-frame non-wearing state in the corresponding region. As a result, only the necessary part (in other words, only the partial region of the imaging result) of the imaging result of the spectacle-frame wearing state can be replaced by the imaging result of the spectacle-frame non-wearing state (in other words, the corresponding region of the imaging result). Therefore, according to the embodiment, only the part required for specifying the measurement reference points is reliably replaced by the face image in the spectacle-frame non-wearing state. In other words, the image part of the spectacle frame not required for specifying the measurement reference points can be reliably deleted, and, as a result, easy and high-precision specifying of the positions of the measurement reference points can be realized. Incidentally, as a situation in which the positions of the measurement reference points to be specified may be obscured, a case in which the temple of the spectacle frame hides the corneal vertex of the subject on the face image as described above is included as a typical example thereof. Regarding this point, in the present embodiment, the target regions of the superimpose synthesis (in other words, the partial region and the corresponding region) are the regions which are set so as to include at least the rim part of the spectacle frame worn by the subject on the face image obtained by imaging the lateral side of the face of the subject, but so as not to include the temple part of the spectacle frame and the eyeball corneal part of the subject. Therefore, according to the present embodiment, even if the corneal vertex of the subject is hidden by the temple of the spectacle frame on the face image, obscuring of the positions of the measurement reference points to be specified can be avoided. As a result, easy and high-precision specifying of the positions of the measurement reference points required for measuring the frame corneal-vertex distance FVD can be realized. In other words, this is extremely suitable for application to a case in which the frame corneal-vertex distance FVD, which is one of the spectacle wearing parameters, is to be measured. The embodiment of the present invention has been described above. However, the above-described disclosed contents show an exemplary embodiment of the present invention. In other words, the technical scope of the present invention is not limited to the above-described exemplary embodiment. Modification examples, etc. will be described below. In the present embodiment, as the synthetic image (third image) of the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state, the case in which the superimpose synthesis image in which the partial region of one of the images is embedded in the corresponding region of the other image is taken as an example. However, the present invention is not limited thereto, and a synthetic image by another synthetic mode may be displayed. Examples of the synthetic image by another synthetic mode include overlapped images in a state in which the transparency thereof is different from each other. Moreover, as long as the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state are displayed in a mutually associated manner, they are not necessarily required to be displayed in a synthesized state. In other words, in the present invention, the processed image (third image), in which the images of the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state are mutually associated, may be generated and displayed, and the measurement reference points may be specified on the processed image. The "association" referred to herein is to enable recognition of the relativity of the images when the measurement reference points are to be specified. Therefore, the processed image in which the images are mutually associated includes the following other than the synthetic image described in the present embodiment. Specifically, an example of the processed image is an image processed so as to display the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state in a juxtaposed manner and align the positions thereof and/or align the sizes thereof so that the pointer images are synchronously moved at the same positions on the images. The processed image is not limited to the example like this. As long as the first image in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state are processed and displayed so as to facilitate viewing of the part required for specifying the measurement reference points regardless of the presence/absence of the spectacle frame, it corresponds to the "processed image (in other words, the third image)" in the present invention. For example, dividing each of the frame-wearing-state and frameless images as described above by a vertical-direction straight line, which is positioned between the corneal vertex and a spectacle front part (the part to which spectacle lenses are attached) and then selecting and juxtaposing the image in the frame wearing state, which is a divided image including the frame front part, and the frameless image, which is a divided image including the corneal vertex, is also a suitable embodiment of the present application. In this case, in the information processing unit 15, rather than newly generating a synthetic image, each of the first image of the subject in the spectacle-frame wearing state and the second image in the spectacle-frame non-wearing state is acquired, and the third image in which the images are mutually associated is prepared. In the present embodiment, mainly, the processing procedure for measuring the frame corneal-vertex distance FVD is taken as an example. Therefore, in the present embodiment, the case in which the images of the lateral side of the face of the subject are synthesized to generate the synthetic image is described. However, the present invention is not limited thereto, and, other than the lateral side of the face of the subject, it is also conceivable to subject a face upper side, a face front side, etc. of the subject to an image synthesizing process similar to that of the case of the present embodiment. For example, in a sunglasses wearing state, if an eyepoint position on the sunglasses is to be specified, it is not always easy to check the corneal position due to the light-shielding function of the sunglasses. Images are obtained by imaging in a sunglasses wearing state and without the sunglasses, and a synthetic image in which the image including at least the corneal vertex and the image including a frame of the sunglasses are joined is created. As a result, the eyepoint position on the sunglasses can be checked. In the present embodiment, the case in which, after the measuring process of the spectacle-frame vertical width (S105) is performed, the calibration of associating the magnitude in the real space and the magnitude on the image is performed based on the processing result thereof is taken as an example. However, for example, the calibration may be performed by the examiner by inputting the numerical value of the value of the spectacle-frame vertical width, which has been measured by using a scale or the like, to the tablet terminal 1. Instead of measuring the spectacle-frame vertical width, the calibration may be performed by using a measurement reference scale formed by a graphic having a predetermined size as an index and imaging the index together with a face image of the subject. Specifically, in the imaging phase, a measurement supporting tool on which a measurement reference scale is drawn with a constituting graphic having a known magnitude (in other words, magnitude in real space) serves as an imaging target together with the face of the subject. Then, it is conceivable that, by using any of graphic parts constituting the measurement reference scale included in the imaging result, calibration of associating the magnitude in the real space and the magnitude on the synthetic image of the lateral side of the face is performed so that scale conversion on the synthetic image of the lateral side of the face is performed. The measurement supporting tool may be realized by utilizing publicly known techniques, and detailed description thereof is omitted herein. In the present embodiment, the image data obtained by the imaging camera unit 11 is used. However, image data other than that may be used. For example, instead of the image data obtained by imaging by the imaging camera unit 11 of the tablet terminal 1, image data obtained by imaging the subject by another imaging device may be used. The imaging camera unit 11 is provided in the tablet terminal 1 merely as a preferred example.
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