[ptx] autopano1.03 comparison to autopano-sift1.4

[Ian Sydenham]

I've run a small comparison of control point creation for 2 images 
2048x1536 taken from a moving cable-car and asking for 100 control 
points. A difficult task anyway, but the comparison was very clear.

Autopano-sift ran *much* slower than autopano1.03 (or 1.02)- I did not 
use a stop watch, but about 3 times as long as autopano.

Autopano-sift at size:2000 found me 100 control points and when 
optimised in Hugin the average control point distance was 0.74 pixels, 
maximum 1.67.

Autopano1.03 at size:2000 found 44 control points and when optimised 
in Hugin the average control point distance was 33 pixels, maximum 53 
pixels.

Autopano-sift at size:800 found 64 control points and when optimised 
in Hugin the average control point distance was 0.75 pixels, maximum 2.14.

Autopano1.03 at size:800 found 29 control points and when optimised in 
Hugin the average control point distance was 14 pixels, maximum 25 
pixels. The optimisation gave a warped image and on closer inspection 
I found 5 incorrect control point matches. Removing them gave a better 
image, but did not significantly improve the control point error.

Summary:
For this test the autopano-sift algorithm generated more control point 
matches, and only found "proper" match points.
Autopano1.03 was much much faster, but the output file still required 
lots of manual changes to get a good image.

Is this comparison similar to anyone else's findings?


regards,

Ian Sydenham