Apparatus and method for encoding halftone images

Details Apparatus and method for encoding halftone images Apparatus and method for encoding halftone images

1992-04-01

1994-08-02

Ro, Bentsu

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358443, 358456, 382 50, G06K 936, H04N 1102

Patent

active

053350880

ABSTRACT:
In accordance with the present invention, an apparatus is provided for encoding a selected halftone pattern to provide a corresponding signal with the selected halftone pattern including a set of pixels arranged in a first block. In one aspect of the present invention, the apparatus comprises an image buffer for buffering a threshold matrix and the first block, and a device, communicating with the image buffer, for determining whether the selected halftone pattern can be formed with the threshold matrix and a single gray value. The apparatus further comprises an encoder for encoding the first block with the corresponding signal in response to a determination by the determining device that the selected halftone pattern can be formed with the threshold matrix and the single gray value.

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patent: 4975785 (1990-12-01), Kantor
patent: 5196942 (1993-03-01), Shiau

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