低码率视频编码中基于对角线抽样的混合DCT算法

摘要

该文提出了一个适用于低码率视频编码的基于对角线抽样(DS- Diagonally Sampled)的混合快速DCT编码方案,此方案包含一个新的3系数DCT算法,同时提出了基于DS的计算色度SAD(Sum of Absolute Difference)的方法用于有效准确地检测全零或3系数的色度块。这一混合算法可以有效的降低DCT、IDCT、量化和反量化的运算量,提高编码器处理速度,而不会导致明显的图象质量的下降。%In this paper,a DS-Based hybrid DCT strategy is proposed,including a novel 3 coefficients DCT and an algorithm calculating chroma SAD(Sum of Absolute Difference)from Diagonally Sampled pixels is also introduced to effectively detect All-zero or Three-coefficient chroma blocks.This hybrid coding strategy efficiently decrease the computation of DCT,IDCT,quantization and inverse quantization,which achieves significant improvement in the processing speed with negligible video-quality degradation.