传统的方法采用图像复制的差错隐藏机制和冗余关键帧抗差错编码结合的技术，由于用与丢失帧距离较远的帧来代替丢失帧，效果不是很好。
The conventional redundant-key-picture error resilience with picture-copy error concealment method may not be efficient due to copy with large distance to the lost picture.
首先使用改进了的像素匹配二次差分法结合双阈值法进行镜头突变和渐变的检测，然后对镜头内的帧间距离进行判断来提取关键帧；
The pixel-matching two-difference algorithm and two histogram comparison are used for shot detection, a method of extraction shot key frame based on distance of adjacent frame is presented.
甚短距离传输(VSR)是一种用于短距离(约30 0 m)内进行STM - 6 4帧数据的光传输系统。
Very short reach (VSR) is an optical communication system to transmit STM-64 data over a short distance (about 300 m).
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