Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication
Patent
1992-12-01
1994-09-06
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Reduced time or bandwidth for static image communication
358432, 358433, 3582613, H04N 1415
Patent
active
053453174
ABSTRACT:
An original grayscale image or color image to be coded is processed by a bi-level image mingled still image coding system to produce a differential image. The original image and the differential image are compared for each pixel block. Only those of the pixel blocks for which the bi-level image mingled still image coding system will be more efficient than a natural image coding system are encoded by the bi-level image mingled still image coding system, and the other pixel blocks are encoded by the natural image coding system. The coding method of the present invention is directed to a grayscale or color image containing an area where pixel values undergo an abrupt change, such as an edge of a letter, or a document with multi-color and natural color images intermingled therein. The method of the present invention obtains a less deteriorated coded image even from an image in which the edge area is very blunt, and moreover, the invention permits high efficiency coding.
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Endoh Toshiaki
Katsuno Satoshi
Coles Sr. Edward L.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
Williams Kimberly A.
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