OpenCV鼠标绘制矩形和截取矩形区域图像分享！

本文实例为大家分享了OpenCV鼠标绘制截取矩形区域图像的具体代码，供大家参考，具体内容如下

在opencv中利用鼠标绘制矩形，代码如下：

  #include <cv.h>   #include <highgui.h>   #include <stdio.h>   #pragma comment( lib, "cv.lib" )   #pragma comment( lib, "cxcore.lib" )   #pragma comment( lib, "highgui.lib" )   IplImage* src = 0;    IplImage* dst = 0;    void on_mouse( int event, int x, int y, int flags, void* ustc)   {     static CvPoint pre_pt = {-1,-1};     static CvPoint cur_pt = {-1,-1};     CvFont font;     cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);     char temp[16];       if( event == CV_EVENT_LBUTTONDOWN )     {       cvCopy(dst,src);       sprintf(temp,"(%d,%d)",x,y);       pre_pt = cvPoint(x,y);       cvPutText(src,temp, pre_pt, &font, cvScalar(0,0, 0, 255));       cvCircle( src, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );       cvShowImage( "src", src );       cvCopy(src,dst);     }     else if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))     {       cvCopy(dst,src);       sprintf(temp,"(%d,%d)",x,y);       cur_pt = cvPoint(x,y);          cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));       cvShowImage( "src", src );     }     else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))     {       cvCopy(dst,src);       sprintf(temp,"(%d,%d)",x,y);       cur_pt = cvPoint(x,y);          cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));       cvRectangle(src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );       cvShowImage( "src", src );     }     else if( event == CV_EVENT_LBUTTONUP )     {       sprintf(temp,"(%d,%d)",x,y);       cur_pt = cvPoint(x,y);          cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));       cvCircle( src, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );       cvRectangle( src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );       cvShowImage( "src", src );       cvCopy(src,dst);     }   }   int main()   {     src=cvLoadImage("lena.jpg",1);     dst=cvCloneImage(src);     cvNamedWindow("src",1);     cvSetMouseCallback( "src", on_mouse, 0 );       cvShowImage("src",src);     cvWaitKey(0);      cvDestroyAllWindows();     cvReleaseImage(&src);     cvReleaseImage(&dst);     return 0;     

在opencv中利用鼠标绘制矩形并截取该矩形区域的图像

测试代码如下：

  #include <cv.h>   #include <highgui.h>   #include <stdio.h>   #pragma comment( lib, "cv.lib" )   #pragma comment( lib, "cxcore.lib" )   #pragma comment( lib, "highgui.lib" )   IplImage* org = 0;   IplImage* img = 0;    IplImage* tmp = 0;    IplImage* dst = 0;    void on_mouse( int event, int x, int y, int flags, void* ustc)   {     static CvPoint pre_pt = {-1,-1};     static CvPoint cur_pt = {-1,-1};     CvFont font;     cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);     char temp[16];       if( event == CV_EVENT_LBUTTONDOWN )     {       cvCopy(org,img);       sprintf(temp,"(%d,%d)",x,y);       pre_pt = cvPoint(x,y);       cvPutText(img,temp, pre_pt, &font, cvScalar(0,0, 0, 255));       cvCircle( img, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );       cvShowImage( "img", img );       cvCopy(img,tmp);     }     else if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))     {       cvCopy(tmp,img);       sprintf(temp,"(%d,%d)",x,y);       cur_pt = cvPoint(x,y);          cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255));       cvShowImage( "img", img );     }     else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))     {       cvCopy(tmp,img);       sprintf(temp,"(%d,%d)",x,y);       cur_pt = cvPoint(x,y);          cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255));       cvRectangle(img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );       cvShowImage( "img", img );     }     else if( event == CV_EVENT_LBUTTONUP )     {       cvCopy(tmp,img);       sprintf(temp,"(%d,%d)",x,y);       cur_pt = cvPoint(x,y);          cvPutText(img,temp, cur_pt, &font, cvScalar(0,0, 0, 255));       cvCircle( img, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );       cvRectangle( img, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );       cvShowImage( "img", img );       cvCopy(img,tmp);       int width=abs(pre_pt.x-cur_pt.x);       int height=abs(pre_pt.y-cur_pt.y);       if(width==0 || height==0)       {         cvDestroyWindow("dst");         return;       }       dst=cvCreateImage(cvSize(width,height),org->depth,org->nChannels);       CvRect rect;       if(pre_pt.x<cur_pt.x && pre_pt.y<cur_pt.y)       {         rect=cvRect(pre_pt.x,pre_pt.y,width,height);       }       else if(pre_pt.x>cur_pt.x && pre_pt.y<cur_pt.y)       {         rect=cvRect(cur_pt.x,pre_pt.y,width,height);       }       else if(pre_pt.x>cur_pt.x && pre_pt.y>cur_pt.y)       {         rect=cvRect(cur_pt.x,cur_pt.y,width,height);       }       else if(pre_pt.x<cur_pt.x && pre_pt.y>cur_pt.y)       {         rect=cvRect(pre_pt.x,cur_pt.y,width,height);       }       cvSetImageROI(org,rect);       cvCopy(org,dst);       cvResetImageROI(org);       cvDestroyWindow("dst");       cvNamedWindow("dst",1);       cvShowImage("dst",dst);       cvSaveImage("dst.jpg",dst);     }   }   int main()   {     org=cvLoadImage("lena.jpg",1);     img=cvCloneImage(org);     tmp=cvCloneImage(org);     cvNamedWindow("img",1);     cvSetMouseCallback( "img", on_mouse, 0 );       cvShowImage("img",img);     cvWaitKey(0);      cvDestroyAllWindows();     cvReleaseImage(&org);     cvReleaseImage(&img);     cvReleaseImage(&tmp);     cvReleaseImage(&dst);     return 0;   }   

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