These are projector error measurements that were generated with moire interference.
The projector projects a grating on top of another grating,which is then measured
by a simple camera setup.
The projector has a grating of 3.281 lp/mm (12 mil/lp) whcih are projected on
2.812 lp/mm (14 mil/lp) in approx. best focus.
Best-position (approx 40mm between lens 1 en grating):
Grating moved to the front (6..8mm space between lens 1 en grating):
Grating moved to the back (80mm space between lens 1 en grating):
The following images are a recorder measurement where a grating was placed
in from of the recorder (12 mil/lp) and recorded as-is.
The original image (resampled):
The original reconstruction:
The polynomial surface backcalculated:
The difference between the reconstruction and the polinomial:
