这段程序为更具图片的轮廓创建RGN对象，从而设定窗口的不规则形状-This program creates the outline for the more pictures RGN object to set the window to the irregular shape

已知一个二值图（内含一个物体的形状），如何将它的轮廓表示出来。-Input a binary image(which includes the shape of an object), how to extract the boundary of the image.