Marker positioning in a 2D image

Question

I use Java as a programming language to fix the problem that I am currently facing.

I need to know the position (x, y) of the markers in the following image.

This has already been done with some java library, I think not?

Markers are small black squares.

Thank you so much for your help.

Answer 1

I think the two chapters of Mastering OpenCV with hands-on computer vision projects would be a good starting point.