Camera Calibration - Camera Matrix and Lens Distortion Coefficients

[Ben Niehaus]

Hi all, 

has anyone created a Camera Matrix and Lens Distortion Coefficients for the Lepton 3.5 radiometric? 

I'm looking to overlay the images with another sensors, and apart from the extrinsic parameter (which I would take from the CAD drawing) I would ideally have the intrinsic as well. 

Using methods like this https://learnopencv.com/camera-calibration-using-opencv/ works well for visible camera, but there are not any charuco boards for thermal cameras. 

Any help is appreciated

Thanks

Ben