First, the information of the foreground areas in current frame is obtained with global motion estimation and image registration between current frame and temporally adjacent frames.
首先，对待合成视频，通过全局运动估计与补偿，将相邻帧在空间上对齐到当前帧。通过计算帧差，得到当前帧中的运动前景区域信息。
A new method is proposed for the estimation of global motion from compressed image sequences.
面向运动背景，全局运动估计是提取运动目标广泛采用的方法。
From this point, the algorithm is implemented by searching and constructing a background image efficiently. With regard to global motion models, four-parameter estimation model is adopted.
算法从全局运动估计的基础出发，利用背景宏块运动相似性的特点快速建立背景宏块集合并采用常用的四参数全局运动估计模型估计运动参数。
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