Based on the MPEG-4 video traffic of low quality and high quality, a hybrid model is presented to capture the frame size at multiple time scales: the change of scene and fluctuation of bit-rate.

针对MPEG - 4的低质量和高质量两种编码质量的视频源，给出了一种混合模型，此模型在多个时间尺度上反映帧大小的变化：场景的变化和同一场景内码流的波动。

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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。

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