Asking about projector-camera calibration

Hi i have found projector -camera calibration coding in github

I would like to ask is there any reference by pictures cause i m not sure what kind of photos have to be taken for the projector calibration.( is it fringe projection on it ? )

Because i know it somehow works similar to stereovision calibration which i can capture the checkerboard and detect the corner and put into as image coordinates,

However, im not sure how to get the image coordinates for the projector

Can i have some help

related question

havent tried, but rather checkerboards

Thanks for ur fast reply!

it might be fringe projected on checkerboards but im not sure wat kind of fringe or how can these fringe become image coordinates of projector