Method and device for coding digital signals which are represent

Details Method and device for coding digital signals which are represent Method and device for coding digital signals which are represent

1995-02-22

1997-10-21

Mancuso, Joseph

Image analysis

Image compression or coding

Adaptive coding

348405, 348419, 382236, 382251, G06K 936, G06K 946

Patent

active

056804830

ABSTRACT:
A device for coding a sequence of pictures divided into successive groups of N pictures arranged in picture blocks or macroblocks and including at least one channel for quantization and variable length coding of the blocks or macroblocks, and a bitrate control sub-assembly. The sub-assembly includes a buffer memory and a device for modifying the quantization step used in quantization of the blocks or macroblocks. The buffer memory and the device for modifying the quantization step are connected in series. The device for modifying the quantization step includes, in series, a first stage for allocating bits for each successive picture of the sequence of pictures, a second stage for allocating bits for the current picture and the (N-1) subsequent pictures, a third stage for correcting the bit allocation for each new picture to be coded, a fourth stage for modifying the quantization step as a function of the corrected bit allocation, and, optionally, a fifth stage for implementing complementary processing operations.

REFERENCES:
patent: 5038209 (1991-08-01), Hang
patent: 5144424 (1992-09-01), Savatier
patent: 5231484 (1993-07-01), Gonzales et al.
patent: 5241383 (1993-08-01), Chen et al.
patent: 5265180 (1993-11-01), Golin
patent: 5301242 (1994-04-01), Gonzales et al.
patent: 5333012 (1994-07-01), Singhal et al.
"Two Layer Video Coding for ATM Networks" G. Morrison et al, Signal Processing: Image Communication vol. 3, Nos. 2-3, Jun. 1991, pp. 179-195.

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