OpenCV鼠标绘制矩形和截取矩形区域图像

2023-08-31 15:35:08 167

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
#include
#include
#pragmacomment(lib,"cv.lib")
#pragmacomment(lib,"cxcore.lib")
#pragmacomment(lib,"highgui.lib")
IplImage*src=0;
IplImage*dst=0;
voidon_mouse(intevent,intx,inty,intflags,void*ustc)
{
staticCvPointpre_pt={-1,-1};
staticCvPointcur_pt={-1,-1};
CvFontfont;
cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX,0.5,0.5,0,1,CV_AA);
chartemp[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);
}
elseif(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);
}
elseif(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);
}
elseif(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);
}
}
intmain()
{
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);
return0;

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
#pragmacomment(lib,"cv.lib")
#pragmacomment(lib,"cxcore.lib")
#pragmacomment(lib,"highgui.lib")
IplImage*org=0;
IplImage*img=0;
IplImage*tmp=0;
IplImage*dst=0;
voidon_mouse(intevent,intx,inty,intflags,void*ustc)
{
staticCvPointpre_pt={-1,-1};
staticCvPointcur_pt={-1,-1};
CvFontfont;
cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX,0.5,0.5,0,1,CV_AA);
chartemp[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);
}
elseif(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);
}
elseif(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);
}
elseif(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);
intwidth=abs(pre_pt.x-cur_pt.x);
intheight=abs(pre_pt.y-cur_pt.y);
if(width==0||height==0)
{
cvDestroyWindow("dst");
return;
}
dst=cvCreateImage(cvSize(width,height),org->depth,org->nChannels);
CvRectrect;
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);
}
elseif(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);
}
}
intmain()
{
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);
return0;
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

OpenCV鼠标绘制矩形和截取矩形区域图像

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