Method and apparatus for rate control accuracy in video encoding and decoding

Abstract

Methods and apparatus are provided for rate control accuracy in video encoding and decoding. An apparatus includes a video encoder (200) for encoding image data using rate control. The rate control involves estimating a quantization step size and adjusting a rounding offset. The rounding offset is capable of being non-constant during the encoding.

Description

Cross References to Related Applications This application claims priority to US Provisional Patent Application 60 / 977,926, filed October 5, 2007, which is hereby incorporated by reference in its entirety. technical field The present invention generally relates to video coding, and in particular, to a method and apparatus for rate control accuracy in video coding and decoding. Background technique Most video coding applications require the encoder to compress the input video at a given target bitrate. To achieve this, the encoder employs a rate control system. A rate control system allocates a certain number of bits to each image in an input video source and adjusts encoding parameters to match the allocated number of bits. The performance of the rate control system is measured by the accuracy with which the target bitrate is met and the visual quality of the compressed video. In video coding standards such as the Motion Picture Experts Group MPEG-2 of the International...

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Problems solved by technology

Therefore, as mentioned above, prior art rate control methods both lack rate control accuracy and produce inconsistent quality

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