Adaptive dynamic range encoding method and apparatus
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United States of America Patent
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Aug 22, 1995
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N/A
app pub date -
Dec 7, 1993
filing date -
Dec 10, 1992
priority date (Note) -
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Abstract
An adaptive dynamic range encoding method and device in which evaluation data mainly centered about the amount of the change in the spatial direction of picture data in a block is detected, and re-quantization is performed which will give a minimum value of the evaluation data. The re-quantization is performed at an optimum quantization step conforming to the picture in the block in such a manner that picture portions having the same level may remain at the same level after re-quantization. This renders it possible to eliminate quantization distortions from being produced in the reproduced picture.
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