Video signal hybrid-coding systems

Details Video signal hybrid-coding systems Video signal hybrid-coding systems

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350/3, 354/67

H04N 7/00 (2006.01) H04N 1/00 (2006.01) H04N 1/41 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/50 (2006.01) H04N 7/60 (2006.01)

Patent

CA 2037444

A video signal coding system allows still and moving picture components of a motion video transmission to be coded using the same algorithm. A posteriori recognition of still pictures is performed and the quantization steps used to code groups of pixels of a still picture which belong to a certain hierarchial level (e.g. the macroblock level) are memorised and used in producing convergence of the quantization step utilized towards a minimum predetermined value. This operation permits the bit rate required to transmit still pictures to be reduced, or the resolution with which such a picture is transmitted to be increased.

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