Incorrect focal length by Camera Calibrator?

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Yuri Rzhanov 2024-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/2087671-incorrect-focal-length-by-camera-calibrator

回答： Yash Sharma 2024-3-21

Hello,

I noticed that Camera Calibrator gives focal lengths approximately twice as big as OpenCV. This affects calculation of the field of view. I think that Camera Calibrator's values are incorrect as field of view provided by camera manufacturer and rough estimates of FoV obtained by myself match the OpenCV values. Is the Camera Calibrator's meaning of focal length different from the standard one?

Thank you,

Yuri Rzhanov

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Answer 1

Yash Sharma 2024-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/2087671-incorrect-focal-length-by-camera-calibrator#answer_1428621

The discrepancy you are observing might be due the fact that OpenCV spatial coordinate system specifies the upper-left pixel center at (0,0), whereas the MATLAB spatial coordinate system specifies the pixel center at (1,1). You can use the "cameraIntrinsicsToOpenCV" function to convert MATLAB "cameraIntrinsics" or "cameraParameters" object, specified by intrinsics, to OpenCV camera intrinsic parameters.

Take a look at the following documentation which can help you further.