使用OpenCV从图像上读取像素坐标位置

最新推荐文章于 2025-06-07 17:53:32 发布

狸猫文

最新推荐文章于 2025-06-07 17:53:32 发布

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CC 4.0 BY-SA版权

文章标签： opencv C++ 鼠标点坐标

本文链接：https://blog.youkuaiyun.com/bisheng250/article/details/53840682

本文介绍了一个简单的OpenCV程序，用于实时显示图像上鼠标点击的坐标，并绘制矩形区域辅助跟踪框定位，适用于图像处理和目标跟踪任务。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

测试跟踪算法的时候，经常需要一个初始的跟踪框，手动标定这个位置就比较麻烦了

可以采用Matlab或者VS来读取对应点的坐标位置

在这说一个OpenCV的小程序，可以显示点击的坐标位置

原理很简单：出发鼠标响应的函数读取了点击的位置，然后直接显示在点击位置的旁边

#include <opencv/cv.h>  
#include <opencv/highgui.h>  
#include <stdio.h>  


IplImage* src = 0;   
IplImage* dst = 0;   
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(dst,src);  
	    sprintf(temp,"(%d,%d)",x,y);  
	    pre_pt = cvPoint(x,y);  
	    cvPutText(src,temp, pre_pt, &font, cvScalar(0,0, 0, 255));  
	    cvCircle( src, pre_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );  
	    cvShowImage( "src", src );  
	    cvCopy(src,dst);  
	}  
	else if( event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))  
	{  
	    cvCopy(dst,src);  
	    sprintf(temp,"(%d,%d)",x,y);  
	    cur_pt = cvPoint(x,y);        
	    cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));  
	    cvShowImage( "src", src );  
	}  
	else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))  
	{  
	    cvCopy(dst,src);  
	    sprintf(temp,"(%d,%d)",x,y);  
	    cur_pt = cvPoint(x,y);        
	    cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));  
	    cvRectangle(src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );  
	    cvShowImage( "src", src );  
	}  
	else if( event == CV_EVENT_LBUTTONUP )  
	{  
	    sprintf(temp,"(%d,%d)",x,y);  
	    cur_pt = cvPoint(x,y);        
	    cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));  
	    cvCircle( src, cur_pt, 3,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );  
	    cvRectangle( src, pre_pt, cur_pt, cvScalar(0,255,0,0), 1, 8, 0 );  
	    cvShowImage( "src", src );  
	    cvCopy(src,dst);  
	}  
}  
int main()  
{  
	src=cvLoadImage("lena.jpg",1);  
	dst=cvCloneImage(src);  
	cvNamedWindow("src",1);  
	cvSetMouseCallback( "src", on_mouse, 0 );  
	  
	cvShowImage("src",src);  
	cvWaitKey(0);   
	cvDestroyAllWindows();  
	cvReleaseImage(&src);  
	cvReleaseImage(&dst);  
	return 0;  
}

效果图如下：