利用opencv中的dilate和erode函数对图片做膨胀腐蚀以及开运算和闭运算等形态学处理，可以在图片窗口划动滑条调节腐蚀和膨胀的参数。(Using the dilate and erode functions of opencv, we can process the image with some typical morphological processing such as dilate and erode.)