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率失真优化技术在视频优化编码中起着重要的作用,广泛地应用于宏块模式决策,优化量化等编码模块中.本文将率失真优化编码与码率控制结合起来进行研究,通过对率失真关系的分析,提出了基于率失真优化的复杂度可分级码率控制算法,并根据缓冲区操作模型的位分配约束条件调整码率控制的位分配过程,从而使得该算法在达到码率控制的同时也能取得较高的编码效率,并能保证缓冲区不会发生溢出,然后结合场景变换、图像内容分类等主观质量问题研究,提出一种恒定质量码率控制编码算法.
The rate-distortion optimization technique plays an important role in the video coding and is widely used in coding modes such as macroblock mode decision and quantization etc. In this paper, rate-distortion optimization coding and rate control are combined to study the rate-distortion The paper proposes a rate control algorithm based on rate-distortion optimization, and adjusts the bit allocation process of rate control according to the bit allocation constraints of the buffer operation model, so that the algorithm can achieve bit rate control At the same time, it can achieve high coding efficiency and ensure that the buffer will not overflow. Then, based on the research of subjective quality problems such as scene change and image content classification, a constant quality code rate control coding algorithm is proposed.