1 | initial version |
your image is not a valid chessboard (but some artificially rendered cube (?) with a chessboard pattern), you cannot use it
please e.g. print out the one from here and take a real image with your camera
2 | No.2 Revision |
your image is not a valid chessboard (but some artificially rendered 3d cube (?) with a chessboard pattern), you cannot use it
please e.g. print out the one from here and take a real image with your camera