openCV实现鼠标响应裁剪图像-蒲公英云

openCV实现鼠标响应裁剪图像

- 日理万妓 2022-06-12 05:10 295阅读 0赞

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：

#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;
}