A BIT-RATE CONTROL METHOD AND DEVICE COMBINED WITH RATE-DISTORTION OPTIMIZATION

摘要

In the invention, a rate distortion optimization (RDO) based rate control method is comprised of following steps: first, does bit allocation for every frame in a GOP; then based on the allocated bits, a predicted quantization parameter is used to do the first rate distortion optimization mode selection for every macroblock in the current frame and calculate the final quantization parameter for rate control; an apparatus for the rate distortion optimization based rate control includes following modules: a video coding encoder module(for example, H.264/JVT processing module), rate distortion optimization based macroblock mode selection and adaptive quantization module, virtual buffer, and global complexity estimation module. As RDO and rate control are considered together in the invention, the RDO based rate control scheme can achieve better coding performance while with accurate target bit rate control. The invention also provides an efficient way for resolving the rate control problem on JVT standard.