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Intelligent differential quantization of video coding

  • US 7,602,851 B2
  • Filed: 07/18/2003
  • Issued: 10/13/2009
  • Est. Priority Date: 07/18/2003
  • Status: Expired due to Fees
First Claim
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1. A method of differential quantization in video coding of a coded video bit stream, comprising:

  • analyzing motion vectors of macroblocks for a frame of a video sequence to determine whether global motion of the video at the frame in the video sequence is characteristic of panning or zooming;

    classifying regions of the frame according to perceptual significance based on the global motion determination;

    differentially quantizing the regions according to their perceptual significance classification in coding a compressed bit stream of the video sequence;

    signaling different quantization of the regions in the compressed bit stream, wherein the signaled different quantization includes signaling different quantization strength for macroblocks in a region on at least one boundary edge of the frame, and wherein the signaling uses a syntax that includes coding a choice of the region from among the boundary edges of the frame;

    reading the signaled different quantization from the compressed bit stream; and

    dequantizing, by an inverse quantizer, the macroblocks of the frame according to the signaled different quantization.

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