High resolution graphics system for video/teleconferencing syste

Details High resolution graphics system for video/teleconferencing syste High resolution graphics system for video/teleconferencing syste

1985-10-11

1987-08-18

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358256, 358261, 379100, H04N 132, H04N 1419, H04N 142

Patent

active

046881085

ABSTRACT:
A high resolution graphics system scans an 81/2.times.11 inch document at a resolution of approximately 200 lines per inch and transmits a run length codes 1700.times.2200 pixel array facsimile signal to a remote station for display or hard copy reproduction. Alternatively the present system can receive a compressed coded facsimile signal, decompress it and convert it to a video signal. The system is a modular design including the document scanning subsystem, a gray-to-facsimile converter, data compression and decompression circuits, as well as a high speed input/output communication system interface. The document scanning subsystem employs a fixed camera capable of scanning a document without any mechanical movement therebetween. The various modules are interconnected by means of a VME bus to a central processing unit which controls and monitors the system. A random access memory (RAM) is included for storing the compressed data either prior to transmission or subsequent to reception. The input/output interface includes a communications port, such as a RS449 port capable of sending or receiving data over the communication system at rates in the range of 56 to 448 Kbs.

REFERENCES:
patent: 4387395 (1983-06-01), Schaphorst
patent: 4486787 (1984-12-01), Gocho
patent: 4494149 (1985-01-01), Furukawa
patent: 4574318 (1986-03-01), Dayton
patent: 4578704 (1986-03-01), Gharavi
patent: 4587633 (1986-05-01), Wang

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