说明：  运动目标检测是整个视频监控系统的最底层，是目标跟踪、目标分类、 标行为理解等的基础，因此运动目标检测是视频序列图像处理的关键环节。
(Moving target detection is the video surveillance system, the bottom is the target tracking, target classification, and so on the basis of standard behavior understanding, so video motion detection is the key link in image sequence processing.)