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H.264/AVC coder incorporating rate and quality controller

  • US 7,986,731 B2
  • Filed: 03/30/2004
  • Issued: 07/26/2011
  • Est. Priority Date: 02/06/2004
  • Status: Expired due to Fees
First Claim
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1. Rate and quality control system for an AVC-based video coder, comprising:

  • a picture analyzer, to generate complexity indicators from each picture of an input video sequence;

    a first quantizer estimator to generate a first quantizer estimate for each picture based on the complexity indicators, a target coding rate calculated for each picture and a transmit buffer fullness indicator representing a quantity of stored previously-coded video data;

    a second quantizer estimator, to generate a second quantizer estimate for each picture, the second quantizer estimates for I and P pictures based on a linear regression analysis of quantizers and coding rates of previously-coded pictures;

    a quantizer selector to generate a quantizer parameter for each picture from the first and second quantizer estimates; and

    a coding policy unit operative according to a rate control policy, wherein the rate control policy is selected based at least on a comparison of the first and second quantizer estimates.

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