2D image points are OK which we can easily find from the image. (These image points are locations where two black squares touch each other in chess boards) we need to know 3D points(X,Y,Z) values. But for simplicity, we can say chess board was kept stationary at XY plane, (so Z=0 always) and camera was moved accordingly. ⇒ Now for X,Y values, we can simply pass points as (0,0), (1,0), (2,0) … (s..