一种基于四维离散余弦变换的视频编码方法  

Video coding technique based on four-dimensional discrete cosine transform

作　　者：赵岩[1] 陈贺新[1] 王长青[1] 

机构地区：[1]吉林大学通信工程学院,吉林长春130012

出　　处：《吉林大学学报（信息科学版）》2002年第4期13-16,共4页Journal of Jilin University（Information Science Edition）

基　　金：国家自然科学基金资助项目 ( 6 0 172 0 46 )

摘　　要：为有效地去除 Y,U,V 3帧之间内在的相关性 ,提出了一种基于四维离散余弦变换理论的彩色视频压缩编码方法。该方法将彩色视频放在四维数学模型中考虑 ,将彩色视频的图象宽度、图象高度、彩色空间的 3帧 ( Y,U,V) ,以及视频序列的连续 3帧分别看作四维数学模型中的“四维”,利用四维离散余弦变换去除彩色视频中图象的相邻像素之间、Y,U,V3帧之间、以及视频序列相邻帧之间的相关性 ,并结合矢量量化进行压缩。实验结果表明 ,利用该方法对“Miss America”彩色视频进行压缩编码 ,在同等信噪比的条件下 ,可获得比标准 MPEG-2压缩编码方法高约 4倍的压缩比。In traditional color video compression coding method, the color space of R, G, B is translated into Y, U, V firstly, then the three frames of Y, U, V are coded using the same method respectively. Thus, the inherent correlation among Y, U and V frame can not be wiped off effectively. A color video coding technique based on four-dimensional discrete cosine transform theory is presented. The color video is considered in the four-dimensional mathematical model, and the image width, image height, three frames (Y, U, V) of the color space, and three continuous frames of video sequence are regarded as the four dimension of the four-dimensional mathematical model. Further, correlations among adjacent pixels in an image, Y, U and V frame in the color space, adjacent frames in a video are all wiped off by four-dimensional discrete cosine transform. Vector quantization is used to compress the transformed coefficients. Experimental results show that color video compression for 'Miss America' using the proposed method can approach four times of compression ratio than that of using standard MPEG method under the similar PSNR.

关 键 词：视频编码 彩色图象 四维离散余弦变换 矢量量化 压缩编码 压缩比 

分 类 号：TN919.81[电子电信—通信与信息系统]