How to convert an image into a top view

This is a little hard to understand. This modification should be done by ps. Why use c++? If you have many such pictures, you can also use ps to do actions. But under normal circumstances, it can't be changed, because the angle is different, and it will be fake if it is changed.

General modification method: freely change in ps, and the adjustment angle is similar to the top view. That's basically it.