Coding apparatus for bi-level images halftoned with error diffus

Details Coding apparatus for bi-level images halftoned with error diffus Coding apparatus for bi-level images halftoned with error diffus

1995-05-26

1997-11-04

Coles. Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358432, G06K 936

Patent

active

056846037

ABSTRACT:
It is sought to provide a coding apparatus which permits high efficiency coding of bi-level images with black-and-white pixels halftoned with error diffusion algorithm. An image input/pixel selection unit selects, from an input image as a bi-level image with black-and-white pixels halftoned with error diffusion algorithm, first selected pixels with respect to a pixel "?" to be coded and second selected pixels as peripheral pixels with respect to the first selected pixels. The first selected pixels are fed to a pixel pattern binary scale translator for translation into a binary number. The second selected pixels, on the other hand, is fed to a pixel value adder for counting of black pixels. The count is fed to a binary scale translator for translation into a binary number. The binary number outputs of the pixel pattern binary scale translator and the binary scale translator are combined to be input to an address input terminal of a ROM having a coding information table.

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"Perceptual Coding of Images for Halftone Display", by David L. Neuhoff and Thrasyvoulos N. Pappas, IEEE Transactions On Image Processing, vol. 3, No. 1, Jan. 1994, pp. 1-13.
"Information technology--Coded representation of picture and audio information--Progressive bi-level image compression", First Edition Dec. 15, 1993, International Standard, ISO/IEC 11544.

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