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US 7,454,068 B2Granted
System and method for providing black white image compression
AssigneeInternational Business Machines Corporation
InventorRavinder Prakash
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Abstract
A compression system and method for compressing a bitonal image. A system is disclosed that comprises: a scaling system for geometrically scaling the bitonal image such that transition and isolated attributes are preserved, wherein the scaling system reduces contiguous sets of original pixels down to fewer scaled pixels; and an encoding system that encodes the scaled bitonal image using an industry standard format.
Claims7
A method for compressing a bitonal image, comprising:
- geometrically scaling the bitonal image;
- wherein the step of geometrically scaling the bitonal image comprises:
- selecting a pair of pixels from the original bitonal image;
- forming a four digit binary value made up of values from the pair of pixels and two flanking pixels;
- calculating a single binary pixel value from the four digit binary value;
- and replacing the pair of pixels with the single binary pixel value;
- and
- encoding the scaled bitonal image using an industry standard technique.
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