说明：   运动目标检测的源程序，能对24真彩色的图象进行处理，通过差影法（差分法）来实现检测！即用当前图象减去前一幅图象！
(Moving target detection in source code, to the 24 true color image processing, through poor shadow method (differential method) to achieve detection! That is, by subtracting the current image before an image!)