Method and device for indicating quantizer parameters in a video coding system
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United States of America Patent
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Aug 28, 2007
Grant Date -
Jan 22, 2004
app pub date -
Apr 23, 2003
filing date -
Apr 23, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method and device for coding of digital video sequence, wherein an indication of quantization parameter (QP) is provided in the encoded bit-stream for decoding purposes. The QP related information is indicated by introducing a sequence level quantization parameter value SQP. More specifically, instead of coding the absolute values of picture/slice QPs, an indication of the difference .DELTA.QP between the sequence level quantization parameter SQP and the picture/slice QP is provided. This eliminates the need to transmit a full QP for every picture/slice, and enables a statistically smaller difference value to be transmitted, thus providing a reduction in transmission bit-rate. The difference value is subsequently used in a corresponding decoder to reconstruct the picture/slice QP.
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