这篇文章将为大家详细讲解有关OpenCV鼠标如何绘制矩形和截取矩形区域图像，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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具体内容如下
在opencv中利用鼠标绘制矩形，代码如下：
#include
#include
#include
#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
#include
#include
#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.xcur_pt.x && pre_pt.ycur_pt.x && pre_pt.y>cur_pt.y)
{
rect=cvRect(cur_pt.x,cur_pt.y,width,height);
}
else if(pre_pt.xcur_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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本文标题：OpenCV鼠标如何绘制矩形和截取矩形区域图像
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