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Adaptive selection of picture-level quantization parameters for predicted video pictures

  • US 8,331,438 B2
  • Filed: 06/05/2007
  • Issued: 12/11/2012
  • Est. Priority Date: 06/05/2007
  • Status: Active Grant
First Claim
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1. In a video encoder, a method comprising:

  • selecting a picture type for a current picture comprising video data, the current picture having an initial picture quantization parameter;

    obtaining a measure of temporal complexity for the current picture;

    selecting a delta quantization parameter for the current picture based at least in part on the picture type for the current picture and the measure of temporal complexity for the current picture, wherein the delta quantization parameter is a difference between a picture quantization parameter for a B-picture and a picture quantization parameter for an I-picture, and selecting includes selecting the delta quantization parameter so that fewer bits are allocated for B-pictures than for I-pictures;

    determining an adjusted picture quantization parameter for the current picture based at least in part on the selected delta quantization parameter; and

    quantizing the video data of the current picture based at least in part on the adjusted picture quantization parameter for the current picture.

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