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Does the curved checkerboard pattern affects the stereo calibration?

asked 2017-11-18 06:37:00 -0500

carl777 gravatar image

I printed the checkerboard pattern with the high resolution, but the wooden frame that I have used to attach my calibration pattern has curved (not planner) shape. Is it affect the stereo calibration?

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answered 2017-11-18 06:55:09 -0500

LBerger gravatar image

updated 2017-11-18 07:00:22 -0500

Yes (and distorsion and matrix calibration are wrong) if you use opencv function :

see Zhengyou Zhang. A flexible new technique for camera calibration. Pattern Analysis and Machine Intelligence, IEEE Transactions on, 22(11):1330–1334, 2000. Abstract ->

We propose a flexible new technique to easily calibrate a camera. It is well suited for use without specialized knowledge of 3D geometry or computer vision. The technique only requires the camera to observe a planar pattern shown at a few (at least two) different orientations.

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Thank you for the quick reply. With this arrangement, I am getting RMS value of 1.1 pixels. Will it lead to a wrong calculation of depth?

carl777 gravatar imagecarl777 ( 2017-11-18 07:16:09 -0500 )edit

With a flat checkboard when rms is less than 0.4, I stop calibration. Use a flat grid. If you really need a good calibration you can buy a grid using aludibond (4 mm thickness) : Example

LBerger gravatar imageLBerger ( 2017-11-18 10:16:39 -0500 )edit
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Asked: 2017-11-18 06:37:00 -0500

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Last updated: Nov 18 '17