Re: Bildverarbeitung?

Hello Ole,

I am working in Fermi/LAT collaboration and often use FITS images in my analysis. From my experience, there is no standard way to process astronomical data in ROOT. But if you are familiar with python, I recommend you to use pyfits and PyROOT.

The biggest problem of ROOT in astronomical data handling is that we cannot plot histograms with inverted x-axis. As you know, we always use celestial and galactic coordinates and its values increases from right to left. Because of this limitation, we have to re-align pixel values in histograms manually and have to put customized TGaxis in x- axis by ourselves.

AstroROOT and other library may be your help, but there is not standard and community-accepted library ever.

Regards,

OKUMURA, Akira oxon_at_ceres.phys.s.u-tokyo.ac.jp Department of Physics, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033
TEL/FAX +81 3-5841-4173/4059
Skype : okumura.akira

On 2009/03/07, at 19:14, Ole Streicher wrote:

> Hi Roottalkers,
>
> I am curious whether one can use ROOT for astronomic topics, since
> it already contains a lot of quite useful methods for that.
>
> Specifically I want to build an interactive vizualization/processing
> tool. Unfortunately, my last contact to ROOT was about 7 years ago,
> and many things may have been changed since then...
>
> In addition to the typical HEP features, I would need a kind of
> image processing: show images (size in the order of 4k*4k) with
> custom color palettes, select a [rectangular|circular|random] region
> and apply f.e. a 2d fit to them, and so on. A special "goody" would
> be the processing of non-rectangular (low-res) images and of 3d-
> images (coordinates + wavelength/energy).
>
> Also needed is the use of astronomy specific data formats (images, n-
> tupes) instead of ROOT ones.
>
> What features according to these topics are already in the current
> ROOT version, and would it make sense to add the missing ones? Is
> there alreasy someone using ROOT on astronomical data?
>
> Ciao
>
> Ole
>
> --
> .
>
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Received on Sat Mar 07 2009 - 17:15:56 CET