Accurate Feature Extraction and Control Point Correction for Camera Calibration with a Mono-Plane Target

Yijun Xiao

Abstract:

The paper addresses two problems related to 3D camera
calibration using a single mono-plane calibration target
with circular control marks. The first problem is how to
compute accurately the locations of the features (ellipses)
in images of the target. Since the structure of the control
marks is known beforehand, we propose to use a
shape-specific searching technique to find the optimal
locations of the features. Our experiments have shown this
technique generates more accurate feature locations than
the state-of-the-art ellipse extraction methods. The second
problem is how to refine the control mark locations with
unknown manufacturing errors. We demonstrate in a case
study, where the control marks are laser printed on a A4
paper, that the manufacturing errors of the control marks
can be compensated to a good extent so that the remaining
calibration errors are reduced significantly.