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Adaptive quantization for enhancement layer video coding

  • US 9,571,840 B2
  • Filed: 06/17/2014
  • Issued: 02/14/2017
  • Est. Priority Date: 06/03/2008
  • Status: Active Grant
First Claim
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1. A computing device including a processor and memory, wherein the computing device implements a video encoder adapted to perform operations comprising:

  • encoding video for a picture organized in multiple color channels, including;

    varying quantization spatially and between the multiple color channels of the video for the picture; and

    for a current unit of the video for the picture, predicting a unit-level quantization parameter (“

    QP”

    ) for the current unit using multiple unit-level QPs for spatially neighboring units; and

    outputting the encoded video for the picture in a bitstream, including;

    signaling QP information in the bitstream that indicates multiple QPs that at least in part parameterize the varied quantization of the video for the picture, the QP information including the unit-level QP for the current unit signaled as a differential QP relative to the predicted unit-level QP for the current unit.

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