省略零平面的彩色视频编码  

Color video coding of omitting zero planes

作　　者：杜相文[1] 赵岩[1] 陈贺新[1] 

机构地区：[1]吉林大学通信工程学院,吉林长春130025

出　　处：《吉林大学学报（信息科学版）》2004年第3期199-203,共5页Journal of Jilin University（Information Science Edition）

基　　金：国家自然科学基金资助项目(60172046);国家自然科学基金资助国际合作与交流项目(60211130507)

摘　　要：为提高彩色视频的压缩比,在定义四维矩阵零平面的基础上,提出了一种"省略零平面"的编码方法。彩色视频在经过四维矩阵离散余弦变换(4DMDCT:Four-dimensionalMatrixDiscreteCosineTransform)和四维矩阵量化后,量化系数中存在着大量的零系数。在对这些系数进行游程编码时,过多的零系数使得互不相同的游程数目多而分散,从而降低了熵编码的效率。"省略零平面"编码使得大多数描述零系数的游程变短,而且变得较为集中。而对于每个子矩阵中省略的零平面信息,用额外的几个比特来表示,并对其进行DPCM(DifferentialPulseCodeModulation)编码。实验结果表明,在保证较好视觉效果的前提下,该方法的压缩比一般可达到200倍以上。Zero plane'of four-dimensional matrix is defined and 'Omitting Zero planes'coding method is presented to increase compression ratio of color video. After 4DMDCT(four-Dimensional Matrix Discrete Cosine Transform) and four-dimensional matrix quantization being applied to color video sequence, many of the quantized coefficients are equal to zero. While coding these coefficients,too many zero coefficients make different runlengths dispersed and the number of them large,which decrease the entropy coding efficiency. 'Omitting zero planes' coding shortens and concentrates the runlengths. Additional few bits are utilized to represent the omitted zero planes in each submatrix, then DPCM (Differential Pulse Code Modulation) coding is applied. Experimental results show that 'Omitting zero planes' coding can compress color video more than 200 times and good quality of the video is preserved.

关 键 词：彩色视频 四维矩阵 四维矩阵离散余弦变换 零平面 

分 类 号：TN919.8[电子电信—通信与信息系统]