[GRASS-dev] Implementation of the High Pass Filter Additive Fusion technique (i.fusion.hpf)

[Moritz Lennert]

On 14/11/13 02:25, Nikos Alexandris wrote:
> Dear GRASS GIS users,
>
> together with Nikos Ves, we share the "i.fusion.hpf" idea/proof of
> concept. At the moment, we have a custom shell script named
> `i.fusion.hpf` (an attempt for a proper GRASS add-on), which implements
> the High Pass Filter Additive (HPFA) Fusion Technique for Pan-Sharpening
> [*]. Nikos V started already porting to Python. How can we proceed in
> sharing it?
>

[...]

> Two questions
>
> ? Can someone confirm that the part of the existing "i.pansharpen" code
> that performs histogram matching (code lines 348 - 431), do so as
> "linearly stretching an image to match another image's Mean and StdDev"?

AFAICT, it applies the method described in [1]. I don't know (and don't 
have the time to think about) what this method does in terms of mean and 
stddev.


>
> ? Would it be desired to get the HPFA algorithm integrated in i.pansharpen?

Yes. I think that if we have a generic module such as i.pansharpen, it 
would be preferable to have all pansharpening methods in that one module.

Mortiz