matlab鼠标框选目标,OpenCV实现鼠标在图像上框选单目标和多目标

本文实例为大家分享了OpenCV实现鼠标框选并显示框选区域的具体代码&＃xff0c;供大家参考&＃xff0c;具体内容如下

鼠标在图像上框选目标&＃xff1a;

1. 用到鼠标回调函数

2. 回调函数里面分三部分

(1)鼠标按下左键

(2)鼠标按下的同时移动左键

(3)鼠标左键弹起

3. 图像显示的刷新

单目标&＃xff1a;

#include

#include

#include

IplImage* src &＃61; 0;

IplImage* tmp &＃61; 0;

void on_mouse( int event, int x, int y, int flags, void* ustc)

{

static CvPoint pre_pt &＃61; {-1,-1};

static CvPoint cur_pt &＃61; {-1,-1};

CvFont font;

cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);//初始化字体

char temp[16];

if( (event &＃61;&＃61; CV_EVENT_LBUTTONDOWN)&&(flags) )//鼠标左键按下时

{

sprintf(temp,"(%d,%d)",x,y);//格式化字符串

pre_pt &＃61; cvPoint(x,y);//获取当前点坐标值

cvPutText(src,temp, pre_pt, &font, cvScalar(0,0, 0, 255));//在图像是打印字符

cvCircle( src, pre_pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );//在图像上画圆

cvShowImage( "src", src );

//cvCopy(src,tmp);//这句有没有&＃xff0c;就是单目标和多目标的问题

}

else if( (event &＃61;&＃61; CV_EVENT_MOUSEMOVE) && (flags & CV_EVENT_LBUTTONDOWN))

{//鼠标移动并且鼠标左键按下

sprintf(temp,"(%d,%d)",x,y);//格式化字符串

cur_pt &＃61; cvPoint(x,y);//获取当前点坐标值

cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));//在图像是打印字符

cvRectangle(src, pre_pt, cur_pt, cvScalar(0,255,0,0), 2, 8, 0 );//在图像上画矩形

cvShowImage( "src", src );

cvCopy(tmp,src);//将img复制到临时图像tmp上&＃xff0c;用于实时显示

}

else if( event &＃61;&＃61; CV_EVENT_LBUTTONUP )

{//鼠标左键弹起

sprintf(temp,"(%d,%d)",x,y);//字体格式化

cur_pt &＃61; cvPoint(x,y);//获取当前点坐标值

cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));//在图像是打印字符

cvCircle( src, cur_pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );//在图像上画圆

cvRectangle( src, pre_pt, cur_pt, cvScalar(0,255,0,0), 2, 8, 0 );//在图像上画矩形

cvShowImage( "src", src );

}

}

int main()

{

src&＃61;cvLoadImage("lena.jpg",1);//读入图像

tmp&＃61;cvCloneImage(src);//复制图像到临时图像上

cvNamedWindow("src",1);//新建窗口

cvSetMouseCallback( "src", on_mouse, 0 );//注册鼠标响应回调函数

cvShowImage("src",src);//显示图像

cvWaitKey(0);//等待按键按下

cvDestroyAllWindows();//销毁所有窗口

cvReleaseImage(&src);//释放图像

cvReleaseImage(&tmp);//释放图像

return 0;

}

多目标&＃xff1a;

#include

#include

#include

IplImage* src &＃61; 0;

IplImage* tmp &＃61; 0;

void on_mouse( int event, int x, int y, int flags, void* ustc)

{

static CvPoint pre_pt &＃61; {-1,-1};

static CvPoint cur_pt &＃61; {-1,-1};

CvFont font;

cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);//初始化字体

char temp[16];

if( (event &＃61;&＃61; CV_EVENT_LBUTTONDOWN)&&(flags) )//鼠标左键按下时

{

sprintf(temp,"(%d,%d)",x,y);//格式化字符串

pre_pt &＃61; cvPoint(x,y);//获取当前点坐标值

cvPutText(src,temp, pre_pt, &font, cvScalar(0,0, 0, 255));//在图像是打印字符

cvCircle( src, pre_pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );//在图像上画圆

cvShowImage( "src", src );

cvCopy(src,tmp);//这句有没有&＃xff0c;就是单目标和多目标的问题

}

else if( (event &＃61;&＃61; CV_EVENT_MOUSEMOVE) && (flags & CV_EVENT_LBUTTONDOWN))

{//鼠标移动并且鼠标左键按下

sprintf(temp,"(%d,%d)",x,y);//格式化字符串

cur_pt &＃61; cvPoint(x,y);//获取当前点坐标值

cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));//在图像是打印字符

cvRectangle(src, pre_pt, cur_pt, cvScalar(0,255,0,0), 2, 8, 0 );//在图像上画矩形

cvShowImage( "src", src );

cvCopy(tmp,src);//将img复制到临时图像tmp上&＃xff0c;用于实时显示

}

else if( event &＃61;&＃61; CV_EVENT_LBUTTONUP )

{//鼠标左键弹起

sprintf(temp,"(%d,%d)",x,y);//字体格式化

cur_pt &＃61; cvPoint(x,y);//获取当前点坐标值

cvPutText(src,temp, cur_pt, &font, cvScalar(0,0, 0, 255));//在图像是打印字符

cvCircle( src, cur_pt, 2,cvScalar(255,0,0,0) ,CV_FILLED, CV_AA, 0 );//在图像上画圆

cvRectangle( src, pre_pt, cur_pt, cvScalar(0,255,0,0), 2, 8, 0 );//在图像上画矩形

cvShowImage( "src", src );

}

}

int main()

{

src&＃61;cvLoadImage("lena.jpg",1);//读入图像

tmp&＃61;cvCloneImage(src);//复制图像到临时图像上

cvNamedWindow("src",1);//新建窗口

cvSetMouseCallback( "src", on_mouse, 0 );//注册鼠标响应回调函数

cvShowImage("src",src);//显示图像

cvWaitKey(0);//等待按键按下

cvDestroyAllWindows();//销毁所有窗口

cvReleaseImage(&src);//释放图像

cvReleaseImage(&tmp);//释放图像

return 0;

}

以上就是本文的全部内容&＃xff0c;希望对大家的学习有所帮助&＃xff0c;也希望大家多多支持。