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Image transmission system

阅读：1001发布：2022-02-20

专利汇可以提供Image transmission system专利检索，专利查询，专利分析的服务。并且A system for converting optical images into digital image signals characterized by low redundancy and for transmitting said digital signals. An image is scanned at a low sensitivity level for the first scanline, a high sensitivity level for the second scanline, a low sensitivity level for a third scanline, etc., to generate a succession of analog image signals each corresponding to a single scanline. Each of the analog image signals is compared with a threshold level signal which alternates, in square wave fashion, between two different threshold levels many times during a single scanline. the comparison results in a transmission signal which is at 0 when the analog image signal is within a first theshold span, which alternates between 0 and 1 when the analog image signal is within a second threshold interval, and which is at a steady 1 when the analog image signal is within a third threshold interval.，下面是Image transmission system专利的具体信息内容。

权利要求

1. An image transmission system comprising means for scanning an image at a repeating plurality of sensitivity levels to generate a sequence of image signals, each image signal corresponding to a scan at a single one of said sensitivity levels; means for generating a threshold level signal comprising a repeating plurality of threshold levels in timed relationship with each of said image signals; and means for comparing each image signal with said threshold level signal to generate a first transmission signal when the level of the image signal is higher than the time related level of the threshold level signal and for generating a second transmission signal when the level of the image signal is lower than the time related level of the threshold level signal.

2. A system as in claim 1 wherein the means for generating the threshold level signal comprises a timing disc having a plurality of slits, a light source and a plurality of photoelectric transducer elements separated by the timing disc, means for rotating the disc with respect to the light source and the photoelectric transducer element and a threshold level switch receiving the output of at least one of said photoelectric transducer elements and providing an output which is a voltage signal alternating between a repeating plurality of threshold levels in timed relationship with each of said image signals.

3. A systme as in claim 1 wherein the scanning means scans the image at an alternating plurality of a higher and a lower sensitivity level.

4. A system as in claim 3 wherein the threshold level signal generating means generates a signal alternating between two levels.

5. A system as in claim 1 wherein the scanning means comprises a fiber optic bundle having an image entry end and an image exit end shaped in the form of a semicircle having an arc of up to 180*, means for moving the image with respect to the entry end of the fiber optic bundle and for projecting the image onto said entry end, and means for converting the intensity of the image emerging at the exit end of the fiber optic bundle to an electrical signal whose voltage level varies with the intensity of the image.

6. A system as in claim 5 wherein the converting means comprises a photoelectric transducer element and a second fiber optic bundle having an image entry end rotating over said semicircularly shaped exit end and having an exit end facing said photoelectric transducer element.

7. An image transmission system comprising: means for scanning an image at a repeating plurality of sensitivity levels, one sensitivity level per scan line, to generate a succession of image signals each corresponding to a scan of one line; means for generating a threshold level signal alternating between a repeating plurality of threshold levels in timed relationship with each of said image signals; threshold circuit means for comparing the instantaneous relative levels of the image signal and of the threshold level signal and for generating a first transmission signal at a first defined relationship between the compared signals and a second transmission signal at a second defined relationship between the compared signals; and a counter receiving the output of the threshold circuit and storing said output as a coded representation of the scanned image.

8. An image transmission System comprising: a. means for scanning an image to generate a succession of image signals each corresponding to a scan of one line of the image; b. means for generating a threshold level signal alternating between a plurality of threshold levels at a frequency substantially greater than that of generating said image signals; and c. means for comparing each image signal with the threshold level signal and for generating a first transmission signal at a first defined relationship between the compared signals, a second transmission signal at a second defined relationship between the compared signals and a third transmission signal at a third defined relationship between the compared signals.

9. An image transmission system as in claim 8 wherein the scanning means inludes means for scanning selected different lines of the image at selected different sensitivity levels.

10. an image transmission system as in claim 8 wherein the means for generating a threshold level signal generates selected different threshold level signals for selected different image signals.

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