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随着因特网和PC技术的不断发展,通过因特网向PC用户提供实时视频服务具有重要的意义。该文结合PC运行的特点,采取快速小波变换,对SPIHT(setpartitioninginhierarchicaltree)算法进行了优化,使其执行速度比标准程序提高了30%～60%;在此基础上,通过加入在时间域上的Harr小波变换,将静止图像SPIHT算法扩展到视频编码领域。新的算法能够生成嵌入式的视频码流,能适应于因特网上多种类型网络不同带宽的要求;而且算法的实现简单,能够在普通PC的硬件平台上完成实时编、解码。
As the Internet and PC technologies continue to evolve, providing real-time video services to PC users over the Internet is of great importance. According to the characteristics of PC operation, the fast wavelet transform (SPIHT) is used to optimize SPIHT (setpartitioning inhierarchical tree) algorithm, and its execution speed is increased by 30% ~ 60% compared with standard program. On this basis, Harr wavelet transform, the still image SPIHT algorithm is extended to the field of video coding. The new algorithm can generate embedded video code stream and adapt to different bandwidth requirements of many types of networks on the Internet. Moreover, the algorithm is simple to implement and can be compiled and decoded in real time on the hardware platform of a common PC.