PlayChessWithAWebCam/BoardFinder
Source Code
see class BoardFinder in module boardfinder tests are in the: test_BoardFinder module
Algorithm
Finding the chessboard
OpenCV has a function findChessboardCorners which is usually used for camera calibration and not really intended for the use case of "real chessboards".
Still it is very helpful and uses as a basis for the BoardFinder.
Examples
