Foreground/background document processing with dataglyphs
AssigneeXerox Corporation
InventorsJeff Breidenbach, David L. Hecht
Life of this patent
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Abstract
An image processing apparatus for encoding and decoding a document containing machine-readable code overlaid by human-readable content such that the code and the human-readable content are both discernable. In operation, a background image is generated, wherein the background image comprises coded glyphtone cells based on grayscale image data values, each of the halftone cells comprising one of at least two distinguishable patterns. The background image is overlaid with a second image such that some visible glyphtone cells may be decoded and the second image may be viewed. Finally, the decoded information enables comparison of aspects of the second image with a predetermined nominal reference.
Claims30
A method of producing a composite machine-readable and human-readable document comprising:
- generating a background image on a substrate, said background image comprising coded glyphtone cells based on grayscale image data values, each of said halftone cells comprising one of at least two distinguishable patterns;
- compositing the background image with a second image such that two or more adjacent visible halftone cells may be decoded and the second image may be viewed.
A method for comparing a first document to a second document, comprising:
- inputting a composite document into a memory, said composite document comprised of a first image overlaying a second image;
- separating the first image from the second image;
- decoding the second image;
- and
- comparing the first image to a decoded version of the second image.
Dependencies are inferred from the claim text.