Method of coding video signals and transmission system thereof
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United States of America Patent
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-
Aug 4, 1992
Grant Date -
N/A
app pub date -
Oct 12, 1990
filing date -
Oct 14, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a video signal coding method for generating transmission data, a digital video signal is quantized by a quantization step which is controlled on the basis of significant picture information to be transmitted. The significant picture information is, for example, the quantity of information in a main region and in a sub region, the quantity of picture information to be coded, the picture motion in coded regions, the amount of variations in picture information between regions to be coded, or the components of spatial frequency with respect to regions to be coded. By reason of such control of the quantization step, deterioration of picture quality of the transmission data can be avoided, while the quantity of transmitted data is reduced.
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