void CQRCodeDemoDlg::OnBnClickedSetRoi() //设置ROI区域
{
src.copyTo(img);
src.copyTo(tmp); //临时变量
namedWindow("view");//定义一个img窗口
setMouseCallback("view",on_mouse,0);//调用回调函数
imshow("view",img);
cv::waitKey(0);
}
void on_mouse(int event,int x,int y,int flags,void *ustc)//event鼠标事件代号,x,y鼠标坐标,flags拖拽和键盘操作的代号
{
static Point pre_pt = (-1,-1);//初始坐标
static Point cur_pt = (-1,-1);//实时坐标
//char temp[16];
if (event == CV_EVENT_LBUTTONDOWN)//左键按下,读取初始坐标,并在图像上该点处划圆
{
src.copyTo(img);//将原始图片复制到img中
// sprintf(temp,"(%d,%d)",x,y);
pre_pt = Point(x,y);
// putText(img,temp,pre_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255),1,8);//在窗口上显示坐标
circle(img,pre_pt,2,Scalar(255,0,0,0),CV_FILLED,CV_AA,0);//划圆
imshow("view",img);
}
else if (event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))//左键没有按下的情况下鼠标移动的处理函数
{
img.copyTo(tmp);//将img复制到临时图像tmp上,用于显示实时坐标
// sprintf(temp,"(%d,%d)",x,y);
cur_pt = Point(x,y);
//putText(tmp,temp,cur_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255));//只是实时显示鼠标移动的坐标
imshow("view",tmp);
}
else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))//左键按下时,鼠标移动,则在图像上划矩形
{
img.copyTo(tmp);
// sprintf(temp,"(%d,%d)",x,y);
cur_pt = Point(x,y);
// putText(tmp,temp,cur_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255));
rectangle(tmp,pre_pt,cur_pt,Scalar(0,0,255,0),1,8,0);//在临时图像上实时显示鼠标拖动时形成的矩形
imshow("view",tmp);
}
else if (event == CV_EVENT_LBUTTONUP)//左键松开,将在图像上划矩形
{
src.copyTo(img);
// sprintf(temp,"(%d,%d)",x,y);
cur_pt = Point(x,y);
// putText(img,temp,cur_pt,FONT_HERSHEY_SIMPLEX,0.5,Scalar(0,0,0,255));
circle(img,pre_pt,2,Scalar(255,0,0,0),CV_FILLED,CV_AA,0);
rectangle(img,pre_pt,cur_pt,Scalar(0,255,0,0),1,8,0);//根据初始点和结束点,将矩形画到img上
imshow("view",img);
img.copyTo(tmp);
//截取矩形包围的图像,并保存到dst中
int width = abs(pre_pt.x - cur_pt.x);
int height = abs(pre_pt.y - cur_pt.y);
if (width == 0 || height == 0)
{
printf("width == 0 || height == 0");
return;
}
dst =src(Rect(min(cur_pt.x,pre_pt.x),min(cur_pt.y,pre_pt.y),width,height));
// namedWindow("dst");
// imshow("dst",dst);
waitKey(0);
}
}
鼠标触发事件画矩形,选择roi区域
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转载自blog.csdn.net/weixin_43491924/article/details/88828430
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