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# how are determined the value of r in the undistortion formula?

user723
1#
user723 Published in June 20, 2018, 12:12 am
 I have already calibrated a stereo infrared camera using openCV. Then I used stereoRectify to get R1, R2, P1, and P2. But for some computation requirements I want to perform myself the rectification of the two stereo images, then to process matching through epi-polar lines. I want to follow these steps ( from OpenCV doc) : Rectification process But unfortunately, I don't know how OpenCV determine the value of r. I have googled a bit and I've found this thesis : Fisheye Camera Calibration and Applications radial distance But I'm a bit disappointed.
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