Adaptive picture image compression system

Details Adaptive picture image compression system Adaptive picture image compression system

1983-11-18

1986-04-01

Olms, Douglas W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358260, 358261, 358138, 358 13, H04N 1104, H04N 712, H04N 140, H04N 1417

Patent

active

045801622

ABSTRACT:
An image compression system wherein the image is arranged in a block 1 of elements which are Hadamard transformed 2 and then quantized 3 into sequences. The DC component is prediction 4 into a DC error prediction term and all the sequences are then encoded 5 into a variable length code depending on the combination of the sequences. The variable length codes are written into a buffer memory 6 at an input bit rate and read therefrom at an output bit rate asynchronously with the writing. A counter 10 keeps track of the amount of unused space in the buffer memory and a quantization characteristic selector 9 uses this amount to determine the quantization level.

REFERENCES:
patent: 3984626 (1976-10-01), Mounts et al.
patent: 4023199 (1977-05-01), Netravali et al.
patent: 4386366 (1983-05-01), Mori

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