Coding system for reducing redundancy

Details Coding system for reducing redundancy Coding system for reducing redundancy

1986-10-27

1987-10-06

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358261, 358262, 375 27, H04N 7133, H04N 7137

Patent

active

046986723

ABSTRACT:
The present invention relates to methods and apparatus for processing signals to remove redundant information thereby making the signals more suitable for transfer through a limited-bandwidth medium. The present invention specifically relates to methods and apparatus useful in video compression systems. Typically, the system determines differences between the current input signals and the previous input signals using mean-square difference signals. These mean-square signals are processed and compared with one or more thresholds for determining one of several modes of operation. After processing in some mode, the processed signals are in the form of digital numbers and these digital numbers are coded, using ordered redundancy coding, and transmitted to a receiver.

REFERENCES:
patent: 4302775 (1981-11-01), Widergren
patent: 4476495 (1984-10-01), Fujisawa
patent: 4520490 (1985-05-01), Wei
patent: 4558370 (1985-12-01), Mitchell
patent: 4633325 (1986-12-01), Usubuchi

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