OpenCV使用鼠标响应裁剪图像

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;

}

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。

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