BLOCK QUANTIZATION PARAMETER ADAPTATION SYSTEM

Abstract: in video compression, the quantization parameter (qp) determines the compression level and bitrate of videos. block-level qp adaptation can improve video encode efficiency, but determining suitable qps at the block-level without incurring significant overhead is not trivial. to address this concern, qp adaptation at a qp unit having one or more blocks can be performed using one or more filtering distortion values which are already calculated for the one or more blocks by a motion compensated temporal filter (mctf). one or more minimal distortion values are used in calculating a distortion metric, which is then used for determining the quantization parameter to be applied to a qp unit. the one or more minimal distortion values are also used for determining a size of the qp unit. different thresholds may be applied to the distortion metric, depending on whether mctf is on or off.

Inventor(s): Minzhi Sun, Ximin Zhang, Yi-jen Chiu

CPC Classification: H04N19/124 (Quantisation)

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