[置顶][置顶]opencv图像处理4--opencv下鼠标事件

雨点打透心脏的1/2处 2022-06-18 03:09 169阅读 0赞

\#include<highgui.h>  
\#include<cv.h>  
\#include<stdio.h>  
//\#include<iostream>  
//鼠标事件  
CvPoint down;  
CvPoint up;  
CvRect rect;  
IplImage \*dst; ![0_1316612827R3hc.gif][]  
void on\_mouse(int event,int x,int y,int flags,void \*param)  
\{  
//鼠标事件分为两个部分，左键按下和左键弹起  
    IplImage \*image=(IplImage \*)param;  
    if (event == CV\_EVENT\_LBUTTONDOWN) //左键按下  
    \{  
        down.y=y;  
        down.x=x;  
        printf("%d  %d",down.x,down.y);  
        cvDestroyWindow("image.roi");  
        cvReleaseImage(&dst);  
  
    \}  
    if (event==CV\_EVENT\_LBUTTONUP)//左键弹起  
    \{  
            
  
  
        up.y=y;  
        up.x=x;  
  
  
//    cvRectangle(image,down,up,cvScalarAll(0),1,8,0);  
if( (up.y > down.y) && (up.x > down.x))//避免出现错误  
\{  
        rect.x=down.x;  
        rect.y=down.y;  
        rect.height=up.y-down.y;  
        rect.width=up.x-down.x;  
        printf("     %d  %d\\n",up.x,up.y);  
        cvSetImageROI(image,rect);//设置掩膜  
        dst=cvCloneImage(image);//复制图片  
  
        cvNamedWindow("image.roi",CV\_WINDOW\_AUTOSIZE);  
        cvShowImage("image.roi",dst);  
  
\}  
    \}  
      
  
\}  
  
  
int main(int argc,char \*\*argv)  
\{     
  
    IplImage \*image;  
  
    image=cvLoadImage("1.bmp",1);  
  
    cvNamedWindow("image",CV\_WINDOW\_AUTOSIZE);  
    cvShowImage("image",image);  
    cvSetMouseCallback("image",on\_mouse,(void \*)image);  
  
    cvWaitKey(0);  
  
      
    cvDestroyAllWindows();  
    cvReleaseImage(&image);  
return 0;   
\}

[0_1316612827R3hc.gif]: /images/20220618/ec84755d47ef48b4a987b4e2383995f5.png