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我試圖借鑑基於鼠標事件幀中的矩形，問題是，我不能這樣做時，我得到了一個視頻蒸，程序崩潰這裏是我的代碼：繪圖
cv::Rect theBox;
bool drawing_box = false;
void draw_box(Mat* frame, cv::Rect rectangle){
cvRectangle(frame, cvPoint(theBox.x, theBox.y), cvPoint heBox.x+theBox.width,theBox.y+theBox.height),
cvScalar(0xff,0x00,0x00));
} 空隙鼠標（INT事件，INT的x，INT Y，詮釋標誌，無效*參數）{
Mat* image = (Mat*) parameter;
switch(event){
case CV_EVENT_MOUSEMOVE:
if(drawing_box){
theBox.width = x-theBox.x;
theBox.height = y-theBox.y;
}
break;
case CV_EVENT_LBUTTONDOWN:
drawing_box = true;
theBox = cvRect(x, y, 0, 0);
break;
case CV_EVENT_LBUTTONUP:
drawing_box = false;
if(theBox.width < 0){
theBox.x += theBox.width;
theBox.width *= -1;
}
if(theBox.height < 0){
theBox.y += theBox.height;
theBox.height *= -1;
}
draw_box(image, theBox);
//cv::rectangle(parameter, theBox, CV_RGB(255,0,0));
break;
}
}
int main(){
cv::Mat frame;
int key = 0 ;
const char* name = "box";
theBox = Rect(-1,-1,0,0);
cv::VideoCapture cap(1);
if (!cap.isOpened()){
cout<< " capture isn't open " << endl;
return -1;
}
cv::namedWindow(name);
while (key != 27){
cap >> frame;
cv::imshow(name,frame);
cv::setMouseCallback(name,mouse,&frame);
key = cv::waitKey(1);
}
cv::destroyAllWindows();
return 0;
}