c++ opencv 形态学操作腐蚀和膨胀

https://www.jb51.net/article/247894.htm(上图图片来自这个博客)

https://codec.wang/docs/opencv/basic/erode-and-dilate（上图图片参考博客）
cv::Mat kernel = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(3, 3));
cv::erode(src, dst, kernel);腐蚀代码
cv::dilate(src, dst, kernel);膨胀代码

参考腐蚀博客：https://blog.csdn.net/m0_54069809/article/details/148148467