OpenCV使用鼠標響應裁剪圖像

2020-01-26 13:34:27

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給定一幅圖像，將其中的某一部分興趣區域裁剪出來，這在PS中很好實現，但是使用openCV如何實現呢？因此本文主要介紹openCV使用鼠標響應來裁剪圖像：

一、代碼部分：

#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、程序運行效果圖：