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Video codec system with real-time complexity adaptation and region-of-interest coding

  • US 20050024487A1
  • Filed: 02/20/2004
  • Published: 02/03/2005
  • Est. Priority Date: 07/31/2003
  • Status: Abandoned Application
First Claim
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1. A method for adapting the number of encoded bits produced by a codec to a system target bit-rate, comprising:

  • determining if the system target bit-rate is such that bits-per-macroblock is less than a predetermined number, if not, setting the frequency at which intra-coded frames are sent to a first predetermined frequency range, allocating bits between intra-coded frames and inter-coded frames according to a first predetermined factor, and controlling quantizer step sizes for the intra-coded and inter-coded frames, if so, setting the frequency at which intra-coded frames are sent to a second predetermined frequency range that is lower than the first predetermined frequency range, unless there is motion in more than a predetermined percentage of the macroblocks, in which case the sending frequency of the intra-coded frames is set to the first predetermined frequency range, and setting to zero transform coefficients having a zig-zag index greater than or equal to a preset number in select intra-coded frame transform coefficient blocks.

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