Compression of digital images of scanned documents

Details Compression of digital images of scanned documents Compression of digital images of scanned documents

2007-05-04

2011-11-29

Bella, Matthew (Department: 2624)

Image analysis

Image compression or coding

Shape, icon, or feature-based compression

C382S164000, C382S166000, C382S176000, C382S177000, C382S232000, C382S237000, C382S257000, C382S282000, C382S290000, C382S292000, C358S426010, C358S464000

Reexamination Certificate

active

08068684

ABSTRACT:
A first aspect of the invention relates to a method for creating a binary mask image from an a inputted digital image of a scanned document, comprising the steps of creating a binarized image by binarizing the inputted digital image, detecting first text regions representing light text on a dark background, and inverting the first text regions, such that the inverted first text regions are interpretable in the same way as dark text on a light background. A second aspect of the invention relates to a method for comparing in a binary image a first pixel blob with a second pixel blob to determine whether they represent matching symbols, comprising the steps of detecting a line in one blob not present in the other and/or determining if one of the blobs represents an italicized symbol where the other does not.

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