error: ‘CV_WINDOW_AUTOSIZE’ was not declared 解决方法

头文件里添加

#include <opencv2/highgui/highgui_c.h>

即可。

Opencv版本4.1.1

 

error: ‘CV_RETR_TREE’ was not declared 和

error: ‘CV_CHAIN_APPROX_SIMPLE’ was not declared解决方法同理。