Method and apparatus for reducing the effect of bleed-through on captured images
First Claim
1. A method for reducing the effect of bleed-through on a captured image comprising:
- illuminating a physical medium with light having a first illumination quality;
recording a first image of the physical medium, wherein the first image of the physical medium is recorded using light reflected from the physical medium;
illuminating the physical medium with light having a second illumination quality;
recording a second image of the physical medium, wherein the second image of the physical medium is recorded using light transmitted through the physical medium; and
combining the first image and the second image to form a captured image, wherein a difference between said first and second images represent a bleed-through of at least one of an image, text and a mark on a first side of said medium to a second side of said medium which is subtracted out to reduce the bleed-through.
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Accused Products
Abstract
A method and apparatus are disclosed for reducing the effects of bleed-through on captured images. Multiple images of a single physical medium are recorded by illuminating the physical medium with at least one light source capable of generating light having a first and a second illumination quality. By combining the recorded images, a captured image with reduced bleed-through may be formed. Reflected light, transmitted light, or a combination of reflected and transmitted light from one or more illumination sources may be used in recording the images. The present invention finds application in photocopy devices, facsimile machines, optical recognition systems, and the like.
106 Citations
22 Claims
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1. A method for reducing the effect of bleed-through on a captured image comprising:
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illuminating a physical medium with light having a first illumination quality;
recording a first image of the physical medium, wherein the first image of the physical medium is recorded using light reflected from the physical medium;
illuminating the physical medium with light having a second illumination quality;
recording a second image of the physical medium, wherein the second image of the physical medium is recorded using light transmitted through the physical medium; and
combining the first image and the second image to form a captured image, wherein a difference between said first and second images represent a bleed-through of at least one of an image, text and a mark on a first side of said medium to a second side of said medium which is subtracted out to reduce the bleed-through. - View Dependent Claims (2, 3, 4, 5)
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6. A digital file tangibly embodied in a computer readable medium, said digital file generated by implementing a method comprising:
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illuminating a physical medium with light having a first illumination quality;
recording a first image of the physical medium;
illuminating the physical medium with light having a second illumination quality;
recording a second image of the physical medium; and
combining the first and the second image to form a captured image, wherein a difference between said first and second images represent a bleed-through of at lest one of an image, text and a mark on a first side of said medium to a second side of said medium which is subtracted out to reduce the bleed-through;
wherein the first image of the physical medium is recorded using light reflected from the physical medium, and the second image of the physical medium is recorded using light transmitted through the physical medium. - View Dependent Claims (7)
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8. An image-capturing system comprising:
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at least one illumination source, said at least one illumination source capable of illuminating said physical medium such that light is reflected from said physical medium and transmitted through said physical medium;
at least one detector, said detector enabled to generate signals in response to said light reflected from said physical medium and said light transmitted through said physical medium, and said detector further enabled to output said signals for image processing; and
an information handling system, said information handling system comprising;
at least one processor;
memory operably associated with said processor; and
a program of instructions capable of being stored in said memory and executed by said processor, said program of instructions enabled to control illumination of the physical medium, receive said electrical signals output by said at least one detector, and process said electrical signals to form a captured image having reduced bleed-through. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for correcting bleed-through in a captured image comprising:
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obtaining information indicative of a first image density of an image formed on a physical medium;
obtaining information indicative of a second image density of the image formed on the physical medium;
comparing the information indicative of the first image density with the information indicative of the second image density to determine what portions of the information are due to bleed-through; and
altering the portions of the information that are due to bleed-through to form a corrected image. - View Dependent Claims (20, 21, 22)
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Specification