What is the minimum circle size in pixels that the Camera Calibrator app can recognize for a circle grid pattern?

I am using the Camera Calibrator app, but the calibration fails, possibly because the circles in my calibration pattern are too small. When using a circle grid pattern, what is the minimum required size in pixels for the circles to be recognized?

Answer 1

[MathWorks Support Team]

When using a circle grid pattern, the minimum size of the circle in the image is 50 pixels. 

Additionally, regarding the calibration failure:

We support five pattern types (Checkerboard, ChArUco board, AprilGrid, Symmetric and Asymmetric Circle Grid), and the five PDF patterns in the documentation are the recommended examples for these types.

If the calibration still fails even when your circles are larger than 50 pixels in diameter, please try performing the calibration again using one of the recommended patterns provided in our documentation. This will help determine if the issue is with the pattern itself.