We can estimate the pose of the checkerboard, after camera calibration. Since the camera coordinate system is virtual (usually at the centre of the lens) and we can not measure the camera coordinate system physically. Thus how can we physically verify the pose of the checkerboard with respect to the camera coordinate system?
Kyung Yung Choi
Camera pose estimation solves the transformation of the frame of checker board (or any target frame used) with respect to that of camera. Estimation error can be quantified by 1. (typically) back-projection error in image space, 2. Target point to observed ray (line of sight from camera centre). Or if you had a paper implemented in the library, error metric might have been well defined.
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