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我想在高级帧差分中实时跟踪图像变化。比如我把手放到OpenMv前方,就会有一个矩形把我的手框起来。再比如我站在OpenMv前方,并向它扔一个网球,就会有一个矩形把网球框起来。OpenMv需要实时跟踪图像变化。当球越靠近OpenMv, 矩形的面积也会扩大。当超过一个阀值(50x50像素),就会打印出“有物体靠近” 的信息。请问有什么函数或例子可以参考吗?