no checkerboards detected in the images

Hi there,

I am using the stereoCameraCalibrator app in MATLAB. I have used it a number of times before with no issues. However, today I am encountering the error: "no checkerboards detected in the images". This is weird because I have double checked to see that both folders have the necessary frames/images. And that each of the images have the necessary checkerboard. I am using the same checkerboard that I have used successfully in the past, under the same lighting conditions and the checkerboard is at the exact same distance from the exact same cameras I have used in the past.

May you please assist me. This is weird. I may be doing something stupid but I can't seem to figure it out. Googling and checking for solutions from people who have encountered this in the past did not help. Thank you.

[Kukhokuhle Tsengwa]

Anyone who can help?

[Matt J]

Have you looked at the images?

[Kukhokuhle Tsengwa]

Hi Matt, yes I have. One can clearly see the checkerboards in all the images. The checkerboards are not even ocludded or incomplete. I am using a 7x10 board.

[Kukhokuhle Tsengwa]

Typical image

[Kukhokuhle Tsengwa]

corresponding image from the other camera

Answer 1

[Kukhokuhle Tsengwa]

When there is too much lighting (which was the case in my images) it seems detectCheckerboardPoints() fails to detect corners. They appear to be "non-contact"/"non-crossing".

I fixed this by setting the value of the HighDistortion parameter to 'true' in detectCheckerboardPoints().

Answer 2

[Benjamin Thompson]

The other camera looks a little washed out in sections due to lighting glare. Try running both images through the single camera calibrator separately to verify which one is causing the problem.

[Kukhokuhle Tsengwa]

Hi Benjamin,

Thank you for responding to my query.

You got the source of the problem right.

When there is too much lighting (which was the case in my images) it seems detectCheckerboardPoints() fails to detect corners. They appear to be "non-contact"/"non-crossing".

I fixed this by setting the value of the HighDistortion parameter to 'true' in detectCheckerboardPoints().

Thank you!