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Memory error during calibration of IR camera


I'm trying to calibrate my IR camera (Optitrack NaturalPoint) using the camera calibration module of OpenCV 3.0.0 and Visual Studio 2015. I used an assymetrical circle grid. I'm using screenshots of the display of the camera. When I run it, I get an memory problem ("Exception thrown at ...") but when I run it with the images given in openCV, the probleme executes cithout errors. So I wonder if one of you have ever experienced the same issue ? Do you have a solution to calibrate IR cameras ?

Thank you in advance