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经过前面各章对VCD工作方式和工作过程的介绍,对VCD图像压缩的概貌有所了解,本章将详细分析MPEG—1图像和声音的压缩编码和解码原理。 一、图像压缩的方法 在PAL制彩色电视中,活动图像由每秒50帧(25场)构成,每幅(场)由625条扫描线组成,而每条扫描线上约有480个像素(以PAL制6M视频带宽计算)。
After the introduction of VCD working methods and working process in the previous chapters, we can understand the general situation of VCD image compression. In this chapter, the principles of compressing and decoding MPEG-1 image and sound are analyzed in detail. I. Method of Image Compression In PAL color television, a moving image consists of 50 frames per second (25 fields), each field consists of 625 scan lines with about 480 pixels on each scan line PAL 6M video bandwidth to calculate).