c++ opencv roi

最新的：
cv::Mat img;
a=
cv::Mat m0 = img(cv::Rect(i0, i1, w, h))

以前的： 

  

   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      //opencv
     
    
   

    

     

    
    

     

      #include "opencv2/opencv.hpp"
     
    
   

    

     

    
    

     

      #include "opencv2/highgui/highgui.hpp"
     
    
   

    

     

    
    

     

      #include "opencv2/imgproc/imgproc.hpp"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      /******************************************************************************************
     
    
   

    

     

    
    

     

      Function: Screenshot
     
    
   

    

     

    
    

     

      Description: 矩形截图
     
    
   

    

     

    
    

     

      Input: src:原图片 rect:截图范围
     
    
   

    

     

    
    

     

      Output: dst:截图后的图片
     
    
   

    

     

    
    

     

      Return: 截图成功返回true,失败返回false
     
    
   

    

     

    
    

     

      *******************************************************************************************/
     
    
   

    

     

    
    

     

      bool Screenshot(IplImage* src, IplImage* dst, CvRect rect)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 try {
     
    
   

    

     

    
    

     

       cvSetImageROI(src, rect);
     
    
   

    

     

    
    

     

       cvCopy(src, dst, 0);
     
    
   

    

     

    
    

     

       cvResetImageROI(src);
     
    
   

    

     

    
    

     
 return true;
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 catch (cv::Exception e)
     
    
   

    

     

    
    

     

       {
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      /******************************************************************************************
     
    
   

    

     

    
    

     

      Function: SafeResetSizeOfRect
     
    
   

    

     

    
    

     

      Description: 安全重置矩形大小
     
    
   

    

     

    
    

     

      Input: src:原图片 rect:截图范围
     
    
   

    

     

    
    

     

      Return: 无
     
    
   

    

     

    
    

     

      *******************************************************************************************/
     
    
   

    

     

    
    

     

      void SafeResetSizeOfRect(IplImage* src, CvRect& rect)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
 try
     
    
   

    

     

    
    

     

       {
     
    
   

    

     

    
    

     

       rect.x = rect.x < 0 ? 0 : rect.x;
     
    
   

    

     

    
    

     

       rect.y = rect.y < 0 ? 0 : rect.y;
     
    
   

    

     

    
    

     

       rect.width = rect.width < 0 ? 0 : rect.width;
     
    
   

    

     

    
    

     

       rect.height = rect.height < 0 ? 0 : rect.height;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 if (rect.x > src->width || rect.y > src->height)
     
    
   

    

     

    
    

     

       {
     
    
   

    

     

    
    

     

       rect = cvRect(0, 0, src->width, src->height);
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       rect.width = std::min(rect.width, src->width - rect.x);
     
    
   

    

     

    
    

     

       rect.height = std::min(rect.height, src->height - rect.y);
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 catch (cv::Exception e)
     
    
   

    

     

    
    

     

       {
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      //调用举例
     
    
   

    

     

    
    

     

      IplImage *src = 0;
     
    
   

    

     

    
    

     

      IplImage *dst = 0;
     
    
   

    

     

    
    

     

      src = cvLoadImage("D:\\1.jpg", CV_LOAD_IMAGE_COLOR);
     
    
   

    

     

    
    

     

      //定义截图范围
     
    
   

    

     

    
    

     

      CvRect rect = cvRect(720, 610, 300, 320);
     
    
   

    

     

    
    

     

      //截图
     
    
   

    

     

    
    

     

      SafeResetSizeOfRect(src, rect);
     
    
   

    

     

    
    

     

      dst = cvCreateImage(cvSize(rect.width, rect.height), src->depth, src->nChannels);
     
    
   

    

     

    
    

     

      Screenshot(src, dst, rect);
     
    
   

    

     

    
    

     

      //保存图片
     
    
   

    

     

    
    

     

      cvSaveImage("D:\\rect.jpg", dst);
     
    
   

    

     

    
    

     

      //释放内存
     
    
   

    

     

    
    

     

      cvReleaseImage(&src);
     
    
   

    

     

    
    

     

      cvReleaseImage(&dst);
     
    
  
 

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/106267174