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unfortunately, i think your result (though pretty bad) is "normal". calibrating cameras is hard and painful. though your rms looks ok, there might be other problems.

• not enough images?
• try with a pattern, that has more corners, https://github.com/opencv/opencv/blob/master/doc/pattern.png
• make sure, you have the whole field of view covered (especially, the corners !)

unfortunately, i think your result (though pretty bad) is "normal". calibrating cameras is hard and painful. painful, and usually needs several attempts. though your rms looks ok, there might be other problems.

• not enough images?
• try with a pattern, that has more corners, https://github.com/opencv/opencv/blob/master/doc/pattern.png
• make sure, you have the whole field of view covered (especially, the corners !)

unfortunately, i think your result (though pretty bad) is "normal". calibrating cameras is hard and painful, and usually needs several attempts. though your rms looks ok, there might be other problems.

• not enough images?
• try with a pattern, that has more corners, https://github.com/opencv/opencv/blob/master/doc/pattern.png
• make sure, you have the whole field of view covered (especially, the corners !)
• the distance between camera and board seems very small. you'll have to use, what you're expecting later, when taking real world images to be rectified.