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随着全球信息化时代的到来，人们了解事物、交换信息的途径已经从纸、笔、书本、话音等发展到通过声光电信号等各种方式更准确、更快捷、更丰富地表达出来。由于大规模集成电路（VLSI）、计算机和通信技术的迅速发展和结合，促进了视频技术的进步与广泛应用。多媒体计算机，多
With the advent of the global information age, people have come to understand things and exchange information from paper, pen, books and voice to more accurate, faster and richer ways through sound and light signals. Due to the rapid development and integration of large scale integrated circuits (VLSI), computers and communications technologies, advances in video technologies and their widespread application have been promoted. Multimedia computer, and more