Method and device for compressing an image signal based upon differential quantization of data
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United States of America Patent
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Oct 23, 2007
Grant Date -
Jun 19, 2003
app pub date -
Sep 19, 2002
filing date -
Sep 21, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
Method of compressing a digital image signal in which a first quantization step set, which is unique for a given segment, is determined so that the number of bits needed to encode the quantized data corresponding to this segment is greater than a target value. This first quantization step set then being modified, as a priority, for the blocks of the segment for which the gain, in the course of this modification, on the reduction of the number of bits needed to encode the quantized data corresponding to the segment to which it belongs, is the highest. This modification is carried out, on as many blocks as is necessary for the number of bits of this segment to be less than or equal to the target value. Device to implement this method.
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