Partially transparent plates for increased image contrast
阅读：640发布：2022-01-05
专利汇可以提供Partially transparent plates for increased image contrast专利检索，专利查询，专利分析的服务。并且A method and apparatus for increasing the contrast of images utilizing a partially transparent plate in close contact with a diffusely reflecting opaque image layer is disclosed.，下面是Partially transparent plates for increased image contrast专利的具体信息内容。
1. A method of increasing the contrast of an opaque imagebearing document comprising: 1. placing the image-bearing surface of said document in intimate contact with a partially transparent plate, said plate comprising a layer of reflecting material overlying a transparent member, said image-bearing surface of said document contacting said layer of reflecting material, 2. illuminating the image-bearing document surface through said partially transparent plate so that a portion of the light that illuminates said image surface will be reflected several times between said plate and said document surface, and 3. picking up said light which has been reflected between said plate and said document surface by a lens system for further display.
2. directing light toward said interface through said layer whereby multiple reflections of light take place between said document and said layer before the light exits said interface area, thereby increasing contrast.
2. illuminating the image-bearing document surface through said partially transparent plate so that a portion of the light that illuminates said image surface will be reflected several times between said plate and said document surface, and
2. An optical system for increasing the contrast of an image on one surface of an opaque diffusely reflecting document comprising:
2. a light source to illuminate said document surface through said partially transparent plate so that a portion of said light will be reflected several times between said plate and said document surface, and
2. transparent means for supporting said layer, said layer accessible for intimate contact with said document,
3. Apparatus for increasing the contrast of an image-bearing document comprising:
3. a source of light for illuminating said document while in contact with said layer through said plate and said layer, said layer having a sufficiently high reflectivity so as to reflect a substantial portion of said light reflected from said document back thereto multiple times to thereby increase the contrast between image and background areas of said document.
3. picking up said light which has been reflected between said plate and said document surface by a lens system for further display.
3. lens means for picking up said light which has been reflected between said plate and said document surface bearing said image for further display.
4. The combination recited in claim 3 further including a lens means for picking up said light reflected between said plate and said document.
5. The combination recited in claim 4 wherein said lens means is arranged at such an angle with respect to said plate as to avoid picking up light from said source directly reflected by said plate.
6. The combination recited in claim 3 wherein said layer reflects at least 20% of the light from the direction of said document.
7. A method of increasing the contrast of image bearing areas of a document with respect to background areas comprising,
8. The combination recited in claim 7 further including the step of viewing the light exiting said interface at an angle different from the angle at which light is directly reflected from the source side of said layer.
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