//istringstream对象可以绑定一行字符串，然后以空格为分隔符把该行分隔开来。
string x1,y1,x2,y2;
//istream& getline ( istream &is , string &str , char delim );
//将输入流is中读到的字符存入str中，直到遇到终结符delim才结束。
getline (linestream,x1, ',');
getline (linestream,y1, ',');
getline (linestream,x2, ',');
getline (linestream,y2, ',');
//atoi 功 能： 把字符串转换成整型数
int x = atoi(x1.c_str());// = (int)file["bb_x"];
int y = atoi(y1.c_str());// = (int)file["bb_y"];
int w = atoi(x2.c_str())-x;// = (int)file["bb_w"];
int h = atoi(y2.c_str())-y;// = (int)file["bb_h"];
box = Rect(x,y,w,h);
}
//bounding box mouse callback
//鼠标的响应就是得到目标区域的范围，用鼠标选中bounding box。
void mouseHandler(int event, int x, int y, int flags, void *param){
switch( event ){
case CV_EVENT_MOUSEMOVE:
if (drawing_box){
box.width = x-box.x;
box.height = y-box.y;
}
break;
case CV_EVENT_LBUTTONDOWN:
drawing_box = true;
box = Rect( x, y, 0, 0 );
break;
case CV_EVENT_LBUTTONUP:
drawing_box = false;
if( box.width < 0 ){
box.x += box.width;
box.width *= -1;
}
if
