Real-time conversion of still-video to half-tone for hard copy o

Details Real-time conversion of still-video to half-tone for hard copy o Real-time conversion of still-video to half-tone for hard copy o

1991-04-29

1993-03-09

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358909, 346 76PH, B41J 302

Patent

active

051930129

ABSTRACT:
A real-time still-video to facsimile conversion system (FIG. 3) converts a still-video image frame into a half-tone facsimile reproduction without having to store an entire intermediated grey-scale image frame. Conversion of a still-video image to a half-tone facsimile output is accomplished by repeatedly transmitting the still-video image frame from a still-video source to a still-video input circuit (10), with a virtual facsimile page synchronization module (20) providing synchronization to a virtual facsimile page. In successive image frames, a video pixel grabber (34) grabs successive columns of image pixels, and provides them to a half-tone pixel converter (32) for conversion to facsimile lines--for the exemplary embodiment a 3.times.3 half-tone pixel format is used, so that the 525 raster lines of an image pixel column are transformed into three facsimile lines using a total of 1575 dots per line (out of the standard 1728 dot facsimile line). After conversion of each column of image pixels, the corresponding facsimile lines are buffered in a facsimile multi-line buffer (36) for conventional facsimile transmission by a half-tone facsimile output module (40) to a facsimile machine for facsimile reproduction.

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patent: 4942477 (1990-07-01), Nakamura

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