提出了一种基于MPEG(moving picture experts group)的全局运动估计技术:利用四参数模型来描述由摄像机运动带来的全局运动,再利用基于块匹配的算法来求解4个参数,进而作相应的运动补偿.由于MPEG视频流中的运动矢量蕴含了最优块匹配的信息,所以不需要对MPEG视频流完全解码,即可进行参数估计.实验证明该算法速度较快,并能通过运动补偿排除由摄像机运动造成的伪运动区域的干扰.

A global motion estimation technology based on MPEG was put forward. First, a four parameter model, which is used to describe the global motion yielded by camera motion, was proposed. Then these parameters were obtained by using an algorithm which is based on block matching, and the global motion could be compensated by these four parameters. Since the motion vectors include the information of the optimum match blocking, these information can be used without completely decoding the MPEG video sequence. The experiment shows that the algorithm is fast, and feint motion field can be excluded by global motion compensation.