The background of video frames indicated by H.264 macro-block coding mode can narrow the range of motion estimation and improve the processing speed.
利用H.264的宏块编码模式所反映的视频帧背景信息进行运动估计,从而缩小了运动估计的范围,提高了对象分割速度。
参考来源 - 基于H.264压缩域的视频对象分割·2,447,543篇论文数据，部分数据来源于NoteExpress
“自上而下”和“自下而上”宏块划分模式选择算法首先作为编码器的快速算法被提出。
The top-down and bottom-up mode selection schemes were first introduced as fast mode decision algorithms for video encoders.
在这种模式中，上方像素块中的四个底部像素被垂直拷贝至经过帧内编码的宏块中。
In this mode, four bottom pixels from the block above are copied vertically into part of an intra-coded macroblock.
随后，通过拉格朗日优化算法，找到了平衡编码量和失真大小的宏块的最佳编码模式。
Then we calculate the Lagrangian cost to balance the rate and distortion, by which we can find the best encoding mode.
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