OpenCV鼠標繪制矩形和截取矩形區域圖像

2020-01-26 13:33:32

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本文實例為大家分享了OpenCV鼠標繪制截取矩形區域圖像的具體代碼，供大家參考，具體內容如下

在opencv中利用鼠標繪制矩形，代碼如下：

#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中利用鼠標繪制矩形并截取該矩形區域的圖像

測試代碼如下：

#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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