Incorrect focal length by Camera Calibrator?
11 views (last 30 days)
Show older comments
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
0 Comments
Answers (1)
Hornett
on 23 Sep 2024
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.
Hope it helps!
0 Comments
See Also
Categories
Find more on MATLAB Support Package for USB Webcams in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!