Document matching and annotation lifting

Details Document matching and annotation lifting Document matching and annotation lifting

G - Physics

06

K

G06K 9/62 (2006.01) G06K 9/34 (2006.01) G06K 9/64 (2006.01) G06T 5/00 (2006.01) G06T 7/00 (2006.01)

Patent

CA 2401065

A method for matching an original document image with a copy image is disclosed. The original document image is defined as an ensemble of blocks, each of the blocks having neighboring blocks. A mask is formed for each of the blocks by dilating foreground pixels included in the block. A best match is searched in the copy image, for each of the blocks, using a search window, by correlating pixels in the mask with pixels in a corresponding portion in the copy image. Each of the best matches has a matching score. Each of the blocks is indicated as "unmatched" when the corresponding matching score is less than a matching threshold. A displacement vector is computed for each of the matched blocks.

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