Image analysis – Color image processing – Compression of color images
Reexamination Certificate
2008-05-20
2008-05-20
Alavi, Amir (Department: 2624)
Image analysis
Color image processing
Compression of color images
C382S199000
Reexamination Certificate
active
10870790
ABSTRACT:
A hybrid compression scheme in which one or more compression schemes are applied to a scanned document depending on its content. Based on the scanned document data itself and edge-map version thereof, a color test is performed to determine if the document is text or a drawing. If only a few colors are detected, the entire document is compressed by a photo compression technique at full resolution. If more than a few colors are present, the document is most likely a mixed mode document, in which case the entire document undergoes segmentation, a process in which text and drawing regions are separated from the background. The mask of the text and/or drawing regions are coded by a bi-level compression technique, whereas background is down-sampled, if necessary, and then compressed by a photo compression technique. A wrapper module is used to wrap the compressed stream(s) into a single file for easy browsing or transmitting.
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Alavi Amir
Seiko Epson Corporation
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