Hi,
I was experimenting with GDAL VRT and KernelFilteredSource
https://gdal.org/drivers/raster/vrt.html#kernelfilteredsource. My aim was to
sharpen aeriel photos a bit for helping visual image interpretation. I was
rather satisfied with the following that, I believe, is an unsharp mask filter
https://en.wikipedia.org/wiki/Kernel_(image_processing). Excerpt from my VRT
file:
<KernelFilteredSource>
<SourceFilename relativeToVRT="1">P4433H.tif</SourceFilename>
<SourceBand>3</SourceBand>
<Kernel normalized="1">
<Size>5</Size>
<Coefs> -0.00390625 -0.015625 -0.0234375 -0.015625 -0.00390625
-0.015625 -0.0625 -0.09375 -0.0625 -0.015625 -0.0234375 -0.09375 1.859375
-0.09375 -0.0234375 -0.015625 -0.0625 -0.09375 -0.0625 -0.015625 -0.00390625
-0.015625 -0.0234375 -0.015625 -0.00390625 </Coefs>
</Kernel>
I tested the sharpened VRT with QGIS and it works well. Now I wonder if it
could be possible to configure Mapserver to have KernelFiltered outputformats
driven by GDAL and VRT. Derived bands might be useful as well. Any thoughts?
-Jukka Rahkonen-
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