NavList:

   

Reply

George,

Greg's calibrations are based on calculated positions of the sun above
the horizon. The procedure he uses for calibration would lead very
likely to larger errors at small angles (refraction). This is a
drawback of this calibration technique. It's for this reason that he
didn't calibrate his lenses for small angles but only for a "useful"
pixel/angle range. Depending on the angle to measure he selects the
appropriate lens. It doesn't really make sense to extrapolate his
calibration data to pixel/angle ranges which haven't been considered
when performing the calibration. The calibration procedure adopted in
SAMT doesn't have this drawback. With SAMT a lens can be calibrated
for all of its pixel/angle range.

Regarding again the conversion function: After some additional
thoughts I gained the impression that the transformation of the second
order polynomial calibration function into the conversion function is
likely to result in the conversion function also to be a second order
polynomial. I'm however not in a position to prove this
mathematically.

Marcel

   

Reply