ATM网中可变比特率小波视频编码和码率控制
VBR WAVELET VIDEO CODING AND RATE CONTROL IN ATM NETWORKS
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摘要: 本文提出了小波视频编码系统及其码率控制的新方法。对原始图像序列进行时间、水平和垂直三维小波分解,并采用改进的等级树集合分区的算法对小波系数进行量化。在图像组级上对该编码器进行码率控制,使其输出码流遵循漏桶控制器的参数,并对不同大小的漏桶缓冲器进行了讨论。仿真实验证明了该编码系统及其码率控制方法的有效性。Abstract: In this paper, a new video coding system based on wavelet transform is presentea,and a rate centrel algorithm is preposed for it．First: 3D wavelet transform is performed to the original image sequence,and an extension of set partitioning in hierarchical trees algorithm is used to quantize the wavelet coefficients.the rate of the coder is contrelled at GOP scale.ensuring that output conforms to the parameters of a leaky bucket Controller.Several leaky buckets with different sizes are discussed too.The simulation shows the efficiency of our coding system and rate control algorithm.
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