CV_RETR_TREE’ was not declared in this scope

编译时报错：

error: ‘CV_RETR_EXTERNAL’ was not declared in this scope; did you mean ‘CV_DEPRECATED_EXTERNAL’?cv::findContours(mid, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);

在对应cpp里添加头文件即可：

#include <opencv2/imgproc/types_c.h>

参考：
https://blog.csdn.net/weixin_43738246/article/details/116521150

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