1-错误
 2-错误原因
 opencv4.x以上,有些宏,API名字改了,需要改为新的
 3-解决方案
 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








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