Method and arrangement for redundancy-reducing picture coding

Details Method and arrangement for redundancy-reducing picture coding Method and arrangement for redundancy-reducing picture coding

1977-09-01

1980-02-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, 364515, H04N 712

Patent

active

041908619

ABSTRACT:
With known methods for predictive decorrelation this decorrelation only applies to one or more previously scanned elements of the same picture line. In accordance with the invention a picture to be scanned is divided into sub-pictures wherein a number of picture lines equal to the number of lines comprised in a sub-picture is intermediately stored in shift registers, a processing circuit being connected to the last stages of these shift registers, which processing circuit multiplies the values of the picture elements of one sub-picture with the same number of coefficients stored in the processing device and which adds the products. In a preferred embodiment the difference values obtained in this manner are also decorrelated in a second stage, the matrix of the difference values being divided into difference value sub-pictures which are shifted, preferably diagonally, relative to the original sub-pictures. A considerably larger surrounding area of each picture element is thus involved in the prediction.

REFERENCES:
patent: T928003 (1974-11-01), Bahl
patent: 2905756 (1959-09-01), Graham
patent: 2921124 (1960-01-01), Graham
patent: 3521241 (1970-07-01), Rumble
patent: 3524926 (1970-08-01), Starr

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