[GRASS-dev] On integrating i.fusion.hpf into i.pansharpen

[Yann Chemin]

Would it make sense to let it be separate?
On Dec 20, 2014 11:52 PM, "Nikos Alexandris" <nik at nikosalexandris.net>
wrote:

> Dear all,
>
> I want to integrate the "AHPF" fusion algorithm, <i.fusion.hpf> [0], into
> <i.pansharpen> [1]. And I need some assistance.
>
>
> 1. <i.pansharpen> has the following, simple, interface:
>
> i.pansharpen [-sl] red=name green=name blue=name pan=name
>    output=basename method=value [--overwrite] [--help] [--verbose]
>    [--quiet] [--ui]
>
> plus
>
> Flags:
>   -s   Serial processing rather than parallel processing
>   -l   Rebalance blue channel for LANDSAT
>
>
> while the HPF implementation looks like:
>
> i.fusion.hpf [-l2c] pan=filename msx=filename(s)[,filename(s),...]
>    outputsuffix=suffix string [ratio=rational number] [center=string]
>    [center2=string] [modulation=string] [modulation2=string]
>    [trim=rational number] [--overwrite] [--help] [--verbose] [--quiet]
>    [--ui]
>
> plus
>
> Flags:
>   -l   Linearly match histogram of Pan-sharpened output to Multi-Spectral
> input
>   -2   2-Pass Processing (recommended) for large resolution ratio (>=5.5)
>   -c   Match color table of Pan-Sharpened output to Multi-Spectral input
>
>
> While the first module appears to be simple and straightforward, it has
> its limitations (rgb required, underlying ihs method restricted to 8-bit
> data). The second module appears complex, but it works right away by simply
> feeding a pan and a multi-spectral band (or bands) and, offers many
> fine-tuning options.
>
> 2. <i.pansharpen> has the R-G-B logic hardcoded (one pan and three
> multi-spectral bands required), while <i.fusion.hpf> will work simply with
> a pan and only one or any number of multiple low-resolution bands.
>
> If all of the fine-tuning options for HPF will be merged into
> i.pansharpen, it'll get "heavy" and complex.  I am asking for help to
> design the integration (not for the actual coding).  Any ideas?
>
>
> Thank you, Nikos
>
>
> --
> [0] <https://github.com/NikosAlexandris/i.fusion.hpf>
> [1] <http://grass.osgeo.org/grass70/manuals/i.pansharpen.html>
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