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Learned Lessons:

1.Dataset: Chessborad images, which were the ones I wanted to use, must be fully flat collected. I was using chessboard projected on an object. That is to be done afterwards, once calibration has been acomplished. So I changed the images for 'just' chessboard pattern on its own, with slightly degrees up&down, rigth&left. About 10.

1. Settings.xml. The settings file needs consistency as well, I was using #corners by counting the number of blocks -squares- over the sides. Wrong! so it is actually the inside corners. So one number less than the squares. There are two blind white outside squares that do not allow to shape 4 corners. So instead of 10, 12 I had it was 9,11.

After that, I got the calibration output I was looking for.