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Hi,

I would like to know how I should go about picking the size of a calibration checkerboard along with the length of the squares? I'm using the OpenCV calibration routine and looking to get adequate "x" "y" "size" and "skew" coverage.

I went with a default checkerboard size of 8x6 and length of square of 2.5cm but with my configuration of stereo baseline, focus distance and field of view, I don't get a good enough calibration result.

1. How does one pick the right calibration checkerboard size?
2. In particular, for cameras where the stereo overlap is relatively less, what sort of checkerboard is best?
3. Is there a way to just calibrate the intrinsics of the cameras one by one and then calibrate just the extrinsics separately?

Thank you

Hi,

I would like to know how I should go about picking the size of a calibration checkerboard along with the length of the squares? I'm using the OpenCV calibration routine and looking to get adequate "x" "y" "size" and "skew" coverage.

I went with a default checkerboard size of 8x6 and length of square of 2.5cm but with my configuration of stereo baseline, focus distance and field of view, I don't get a good enough calibration result. I believe this is because I couldn't get enough samples in the stereo overlap region or because the "size" parameter was not satisfied.

1. How does one pick the right calibration checkerboard size?
2. In particular, for cameras where the stereo overlap is relatively less, what sort of checkerboard is best?
3. Is there a way to just calibrate the intrinsics of the cameras one by one and then calibrate just the extrinsics separately?

Thank you