OpenCV Return value from mouse callback function

Question

In OpenCV I want to return the point position like Point(x,y) to the main() function that I　click on the image in the mouse callback function . Is there anyway other than se

Answer 1

No, this isn't possible, since the on_mouse() is a callback function. Here is the opencv documentation of it.

So, "global" variables are the only way to solve this problem. Alternatively, if you're looking for a nicer solution, you can create a wrapper class in which you have the namedWindow and the MouseCallback and a private member variable, which is manipulated when mouse callback function is called.