该编码方法通常生成两种视频流：基本层码流和增强层码流。
FGS video streaming is to code a video sequence into a base layer and multiple enhancement layers.
基本思想是保持基本层码流不变的情况下，根据带宽的变化动态地改变传输中的码流来提高视频质量。
The basic idea is to change the enhancement bitstream transmitted to improve the performance while the base layer remains the same.
研究结果表明，在运动估计中加入此准则算法，搜索速度有较大幅度提高，而图像质量和码流基本保持不变。
The experimental results expatiate that the average speed of search can increase greatly by introducing the proposed algorithm without considerable performance and bit-rate change.
研究结果表明，在运动估计中加入此准则算法，搜索速度有较大幅度提高，而图像质量和码流基本保持不变。
The experimental results expatiate that the average speed of search can increase greatly by introducing the proposed algorithm without considerable performance and bit-rate change.
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