error: ‘CV_LOAD_IMAGE_UNCHANGED’ was not declared in this scope

1-Error
2-Error cause
Opencv4.x and above, some macros and API names have been changed and need to be changed to new ones
3-Solution

 CV_LOAD_IMAGE_UNCHANGED 改为 cv::IMREAD_UNCHANGED
   CV_LOAD_IMAGE_GRAYSCALE  改为 cv::IMREAD_GRAYSCALE
   CV_LOAD_IMAGE_COLOR    改为 cv::IMREAD_COLOR
   CV_LOAD_IMAGE_ANYDEPTH   改为 cv::IMREAD_ANYDEPTH

   
   
    
    

   
   
    
    

LINK

1-Error
2-Error cause
Opencv4.x and above, some macros and API names have been changed and need to be changed to new ones
3-Solution

 CV_LOAD_IMAGE_UNCHANGED 改为 cv::IMREAD_UNCHANGED
   CV_LOAD_IMAGE_GRAYSCALE  改为 cv::IMREAD_GRAYSCALE
   CV_LOAD_IMAGE_COLOR    改为 cv::IMREAD_COLOR
   CV_LOAD_IMAGE_ANYDEPTH   改为 cv::IMREAD_ANYDEPTH