System incorporating an error tolerant picture compression algor

Details System incorporating an error tolerant picture compression algor System incorporating an error tolerant picture compression algor

1988-02-05

1989-01-10

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, 358138, H04N 713, H04N 1104

Patent

active

047977299

ABSTRACT:
The system and method of the present invention compresses digitized color image signals in real time with an error tolerant compression algorithm utilizing block truncation coding. The system operates upon the digitized color components Y, I and Q derived from scanning an image plane. Memory buffers, under control of an address generator, receive digitized color components and store them in a 4.times.4 block format. The system further subdivides each Y and I block into four 2.times.2 blocks. An I.sub.avg. signal is derived by averaging 4 neighboring pixels in each 2.times.2 block of the I image plane, and a Q.sub.avg. signal is derived by averaging the 16 pixel values forming the 4.times.4 block of the Q image plane. Signal compression is accomplished by representing the Y and I blocks with two values and a bitmap. Three pipelined signal channels work in parallel to real-time process the signals. The processed signals are encoded for transmission over a channel. At the channels receiver a decoder decodes the signals and a decompression circuit reconstructs the Y, I and Q signals.

REFERENCES:
patent: 3403226 (1968-09-01), Wintringham
patent: 4205341 (1980-05-01), Mitsuya
patent: 4319267 (1982-03-01), Mitsuya
patent: 4672427 (1987-06-01), Rzeszewski
patent: 4716453 (1987-12-01), Pawelski
patent: 4740832 (1988-04-01), Sprague

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