[ptx] dirty lens and autopano-sift?

[Bruno Postle]

On Thu 26-Jan-2006 at 16:40 -0200, manouchk wrote:
>
> http://emmanuelfavrenicolin.free.fr/Public/Divers/Snapshots/autopano-artifacts
>
> Lens is so dirty that it leads to very annoying that autopanosift ends using 
> as stitching points on photos that doesn't share area the one with the other. 
> Does anyone have an idea of a software that allow to remove those type of 
> artifacts ??

You can remove these artifacts completely by discarding all the 
brightness information in the photos, leaving only the 
hue/saturation:

http://bugbear.blackfish.org.uk/~bruno/misc/artefacts/

In the gimp you need to give the layer an alpha channel, set the 
layer mode to 'colour' and put a 50% grey layer underneath.

Unfortunately autopano-sift depends on the brightness intensity to 
locate features, so you need to flatten the image and discard two of 
the colour channels to get something with usable features.

After you have found control points with autopano-sift, just switch 
back to the unaltered original images and use them for stitching.


-- 
Bruno