给定一幅图像，将其中的某一部分兴趣区域裁剪出来，这在PS中很好实现，但是使用openCV如何实现呢？因此本文主要介绍openCV使用鼠标响应来裁剪图像：
一、代码部分：
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#include "stdafx.h"
#include "cv.h"
#include <highgui.h>
#include <stdio.h>
IplImage* org = 0;
IplImage* img = 0;
IplImage* tmp = 0;
IplImage* dst = 0;
//The mouse cuts the image accordingly
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);
cvWaitKey(0);
cvSaveImage("..\\post_img\\71253.jpg",dst);
}
}
int _tmain(int argc, _TCHAR* argv[])
{
org=cvLoadImage("..\\image_norm\\71253.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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二、程序运行效果图：
将鼠标放在原图上的某一点，会显示相应点的位置坐标。至此，openCV使用鼠标响应实现图像裁剪已经实现。
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服务器之家。
原文链接：https://blog.csdn.net/lindamtd/article/details/75203514