Video encoder which uses intra-coding when an activity level of a current macro-block is smaller than a threshold level
First Claim
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1. In an encoder for coding a sequence of video frames to generate a compressed bitstream, a method for determining whether to use intra-coding or inter-coding to code a macroblock in a frame, said method comprising the steps ofcoding said macroblock in said encoder using intracoding:
- (1) if an intra-activity of said macroblock is smaller than a threshold,(2) if a displaced frame difference activity of said macroblock is larger than said intra-activity of said macroblock plus an intra-bias of said macroblock,wherein said intra-bias of said macroblock is a function of a quantization scale factor utilized by said encoder to code said macroblock, said intra-bias of said macroblock increasing with increasing quantization scale factor.
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Abstract
A rate control algorithm for an MPEG-2 compliant encoder is described. The rate control algorithm has embodiments useful for constant bit rate and variable bit rate encoding.
In particular, the invention relates to a quantization biased, activity based inter/intra decision.
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Citations
2 Claims
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1. In an encoder for coding a sequence of video frames to generate a compressed bitstream, a method for determining whether to use intra-coding or inter-coding to code a macroblock in a frame, said method comprising the steps of
coding said macroblock in said encoder using intracoding: -
(1) if an intra-activity of said macroblock is smaller than a threshold, (2) if a displaced frame difference activity of said macroblock is larger than said intra-activity of said macroblock plus an intra-bias of said macroblock, wherein said intra-bias of said macroblock is a function of a quantization scale factor utilized by said encoder to code said macroblock, said intra-bias of said macroblock increasing with increasing quantization scale factor. - View Dependent Claims (2)
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Specification