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25 Jul 2018
Glad to announce of release of INDI Library v1.7.4 on 2018-07-25. A few drivers were added in this release as we continue to improve & stabilize existing drivers.
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TOPIC: CCD_SIMULATOR and the gsc dataset

CCD_SIMULATOR and the gsc dataset 3 months 1 day ago #26052

Dear all,

First I would like to thank you for the awesome work you have done with indi/ekos/kstars.
I use mainly Indi and I am trying to implement (slowly) my own sequencer in python using pyindi and other python opensource packages. My medium term goal is to have a fully automated virtual observatory, and of course, the long term goal is to implement it with real hardware ;)

I am pretty happy with what I have now thanks to indi, but I would like to go further on the image processing side now. I really like the ccd_simulator that is implemented in Indi although I havent had the occasion to look at the code.

For now, it looks like, depending on the frameType (FRAME_DARK, FRAME_FLAT, FRAME_LIGHT), I got realistic images, in 16 bits, where the mean level, and noise level (white gaussian noise I guess ?) depends on the exposure time.
If this is trye, it is already truly awesome !

There are two things I would need to know:
-what is the noise model and what are its parameters for each images (I need to know the ground truth values)
-it is possible to see actual deep sky objects on the images that come from gsc package ?

I downloaded the gsc package, but it looks like it only contains star catalogs, and generates star images. This is great because it allows to play with astrometry engines.
But I would like to know if the appearance, signal/noise ratio and maximum visible magnitudes are influenced by some parameter that can be tweaked,

Thank you in advance for your help[.

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Re:CCD_SIMULATOR and the gsc dataset 3 months 1 day ago #26054

The following user(s) said Thank You: dolguldur

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Re:CCD_SIMULATOR and the gsc dataset 3 months 1 day ago #26056

Thank you Eric for your answer, most of the answer I was looking for are in that code indeed !

Additional question, any idea where I can find the documentation for this "gsc" application ?

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Last Edit: by dolguldur.

Re:CCD_SIMULATOR and the gsc dataset 2 months 4 weeks ago #26129

"gsc" is a catalog of guide stars used by Hubble. Jasem wrote a wrapper to access that catalog, check his ppa on launchpad. You can download the binary package and also the source tree from there.

launchpad.net/~mutlaqja/+archive/ubuntu/ppa/+packages

-Eric
The following user(s) said Thank You: dolguldur

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