[gdal-dev] Availability of Lanczos and cubicspline in gdaladdo

[Seth Price]

I actually hope to be addressing performance in my GSoC project. I'm
interested in rewriting the GDAL resampling code to CUDA, so the graphics
card does the hard work. For example, instead of processing one pixel at a
time, the latest GeForce GTX 260 would be able to process 216. I'm hoping
for CUDA to be 50 to 100 times faster.

Make sure you're using GDAL 1.6 or later, I recently rewrote the regular
Lanczos/cubicspline warping code to be much faster.
~Seth


On Mon, March 30, 2009 3:16 pm, Benoit Andrieu wrote:
> Sounds interesting !
> I am curious to know what you will try to do in your project !
>
> I am very interested in producing high quality images resulting for
> mapserving and image merging.
> We are using GDAL / Mapserver in our software suite. I made a try with
> GeoServer and I found the results were very nice comparing to Mapserver.
> We did not try to use GeoServer after that because there were others
> artifacts.
>
> But now that I have seen Lanczos and cubicspline results on our images
> using GDAL, I am convinced that there is something to do about Mapserver
> to challenge GeoServer !! ;)
> Of course, performance is a really big problem with Lanczos/cubicspline...
>
> I'll take a look at the code.
>
> Regards,
>
> Benoît Andrieu
> bea at ixsea.com
> benoit.andrieu at gmail.com
>
>> -----Message reçu-----
>> De: "Seth Price" <seth at pricepages.org>
>> À: Benoît Andrieu <bea at ixsea.com>
>> Cc: gdal-dev at lists.osgeo.org
>> Date: 30/03/2009 20:38
>> Objet: Re: [gdal-dev] Availability of Lanczos and cubicspline in
>> gdaladdo
>>
>> The resampling code between gdal_warp and gdaladdo is completely
>> separate,
>> thus it is basically two different projects. For the Google Summer of
>> Code
>> application I'm about to submit I will be working on the resampling code
>> in GDAL's warper and GRASS. If I have time (and my application is
>> accepted!) I'll try to look into gdaladdo also.
>> ~Seth
>>
>>
>> On Mon, March 30, 2009 12:27 pm, Benoît Andrieu wrote:
>> > Hi list !
>> >
>> > I was wondering why the Lanczos and cubicspline are available in
>> gdal_warp
>> > and not gdaladdo ?
>> >
>> > The quality after downsizing images with gdalwarp is so perfect that I
>> am
>> > now willing to include this in my overviews.
>> > Is there any chances to have this include in future releases or is
>> there
>> > any difficulties I am not aware of ?
>> >
>> > Benoît Andrieu
>> > bea at ixsea.com
>> > benoit.andrieu at gmail.com
>> >
>> > _______________________________________________
>> > gdal-dev mailing list
>> > gdal-dev at lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/gdal-dev
>> >
>
>