【摘要】 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。更多还原

【Abstract】  With the development of Internet and PC technology, real time video services over the Internet are of great interest. The fast wavelet transform (FWT) was used to optimize implementation of the original SPIHT (set partitioning in hierarchical tree) algorithm for the characteristics of the PC to improve its run speed by 30% to 60%. The still image version of the SPIHT algorithm was then extended to video coding by adding the Harr Wavelet Transform in the time domain. The new algorithm generates an embedded video coding stream, fit to the different bandwidths of different physical networks in the Internet. Furthermore, the algorithm is simple enough to realizing real time coding/decoding on a general PC platform.更多还原