Calibrated projective registration

Hi Dane @donkrx,

for that lens I would always use calibrated projective, on a mosaic project it is critical even !

The technical reason is: the normal projection of a normal photography lens (or telescope) is rectilinear. But the rectilinear projection only works okay with Field Of Views smaller than 120 degrees.

If the field of view becomes larger than 120 degrees any image that is rectilinear projected gets distorted big time... it can blow up to infinite dimensions when you have a FOV near 180 degrees.

Calibrated Projective registration model makes APP calculate camera parameters enabling you to use different projections. So in that case, you need to use calibrated projective model and then choose any other projection model than rectilinear. The differences between equirectangular or mercator are well described i think on wikipedia?

Mabula

Right, well, (using DDC) when I use calibrated projective, the registration RMS is very bad - averaging about 6 over all of my lights with a maximum of 10! Hence this question because it seems to me like you said that this lens might benefit from a different projection model.

I have not tried integrating the equirectangular or mercator projections but the rectilinear was pretty bad with everything out of alignment, even the image center.

When I run with the standard projective option though, the result looks good. Registration RMS ranges from 0.2 to 0.54 and seems to get worse with my later subs so maybe I did a bad job adjusting my camera position (shooting static from tripod).