【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。更多还原

【Abstract】 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.更多还原