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

[Nikos Alexandris]

Moritz Lennert wrote:
..
> I just did a quick test:

> pan in:
> mean: 31.813
> standard deviation: 3.75447
> 
> ms in:
> mean: 15.2307
> standard deviation: 3.55858
> 
> pan out:
> mean: 15.6117
> standard deviation: 3.23408

> So for this example, mean seems to have been adjusted, but stddev not.

Thanks. Looks not to be the exact same here too.

> >  > > ? 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.

> > There is one "difference" in that HPFA treats all bands to be sharpened
> > separately. And, in this manner, it can be (mis-)used to sharpen any
> > low-res band. For example, WorldView-2 products have 8 multi-spectral
> > bands. Hence the "not red= green= blue=" design so far from my side.

> i.pansharpen does not imply rgb either (although the description of the
> ms* parameters does suggest that. You can obviously use any ms bands you
> want.

Yes, I know. I just wanted to avoid this r= g= b= logic. Maybe I am wrong and perhaps it 
is better, indeed, to follow the common path.

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