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27 Feb 2017
INDI development team is happy to announce the release of INDI Library v1.4.0. This new exciting release builds on the maturity of INDI Library and comes with many new supported devices and fixes for existing drivers. Several improvements and enhancements are included in this release including native support for Cygwin and MacOS platforms in addition to Linux, BSD, and Windows (Client only).
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TOPIC: Image Autoguiding

Image Autoguiding 4 months 6 hours ago #15508

Hi.

I subscribe to The Astro Imaging Channel that does a broadcast each week on imaging topics. A recent one that i thought was very interesting and something I had not seen or heard of before, was a presentation on Image Autoguiding by Robert Majewski. Its apparent that this approach has many advantages, and in many ways improves guiding accuracy and simlicity. The presenter was looking for a development partner as he has developed this on Mac and was looking to Windows as a next step.

I felt that this may well be of interest to the developers of EKOS/Indi as I am not a dev.

The Youtube presentation is here and Robert does give a contact email during the talk.
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Last Edit: by Horus Astro.

Image Autoguiding 4 months 6 hours ago #15510

Thank you, that was interesting, but the question is: is it open source? If it is, then incorporating this into Ekos is a possibility.

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Jasem Mutlaq
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Image Autoguiding 4 months 2 hours ago #15515

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The issue of license is important only if you would like to adapt the app for e.g. KDE.
The idea could be used without any input from the author since this is simple math
(FFT phase shift used instead of centroid tracking). It would actually be easier to insert
this as an alternative step into EKOS guiding module replacing centroid calculation.
The math is public and the idea is published now so any issues with potential patents
are non-existent. We can (and probably should) contact the author - but we can implement
the idea without his input (but should credit him with the idea). He is an OSX user so I would
not expect him to be too excited about free software...

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P.
Last Edit: by Jochym.

Image Autoguiding 4 months 1 hour ago #15516

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Shell we contact the author about his intentions?

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P.

Image Autoguiding 3 months 4 weeks ago #15519

I feel my job is done here in that my intention was to get the users involved that could take this idea forward. If you have watched the full video you will have seen that it is possible to track using a indoor surface. It is this that made me feel this approach to guiding should be investigated. I do hope this is implemented as it would result in many cases only requiring one camera to both guide and take images.
I will monitor with interest.

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Image Autoguiding 3 months 4 weeks ago #15525

I watched this presentation earlier last week, Very interesting stuff. If I recall they mention a few times that they would be happy to share this for further development, and I think the host might have mentioned Jasem, and Kstars INDI directly.

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Image Autoguiding 3 months 4 weeks ago #15526

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I may be able to help with signal processing part - I have some experience in this area. Jasem is, obviously, the best person to talk about ekos. I would hope for the positive attitude of the author (judging from few sentences in the presentation) but I would not take it for granted. People are often seduced by the illusory possibility of commercialisation of ideas. I've seen it multiple times.

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P.

Image Autoguiding 3 months 4 weeks ago #15528

Jochym wrote: Shell we contact the author about his intentions?


Yes please go ahead and let's see how it goes from there.

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Jasem Mutlaq
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Image Autoguiding 3 months 4 weeks ago #15541

What I do not understand is that 15 seconds exposure mentioned in the video. If I remember correctly he said he broke the exposures into 15s subexposures and sum them in ram for the final exposure for
the image autoguiding with the main camera. Then another person in the video asked for that 15 seconds because astroimaging would normaly use exposures 1 to 15 minutes and he said you could also use the guiding scope to do the image autoguiding and use the main camera for longer exposures. That was the point where I was wondering because at the beginning of his presentation he claimed the errors that are introduced by those other methods to guide (fov, differential flexure,jitter) and then he recommends one of those to have longer exposures on the main camera. Maybe I missunderstood something :oops:

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--= human, without Windows™ =--
pls excuse my bad english! :)

Image Autoguiding 3 months 4 weeks ago #15548

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It has two modes. The traditional guide scope mode and zero drift mode using short exposure stacking as a imaging technique. His goal is to keep the star on the same photocell. Otherwise this technique is pointless - you can just align and stack the images without any guiding but you will loose the calibration accuracy.

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P.

Image Autoguiding 3 months 4 weeks ago #15580

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The original author responded and agreed to cooperate with us in implementing his idea in ekos. Furthermore, I got few attachments, with detailed theory of operation paper and code samples. After short review it seems the implementation should be quite straightforward. Unfortunately, I have no experience with EKOS and QT programming. I can implement the image processing part. I will try to have a prototype proof-of-concept implementation soon.

Jasem, would it be possible for you to implement just a skeletal generic guide module with gui and just empty functions for the xy_shift(ref_im, cur_im) implementation?
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P.

Image Autoguiding 3 months 4 weeks ago #15584

Pawel, I will setup something soon that can be used for testing for this. Will create a branch in KStars and email you the details.
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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
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