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 accordinglyvoid 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;} |
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
