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INDI Library v1.7.6 Released. (27 Feb 2019)

First release of 2019 comes with quite a few new drivers across the board along with significant performance improvements to INDI camera and live streaming performance. Many drivers received significant updates to improve performance & stability, while a few were re-written from scratch to be in line with INDI standards. Here are some of the highlights:

New Bahtinov Mask Assistant Tool

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New Bahtinov Mask Assistant Tool was created by sneubert

Dear all,

I have started to make a prototype for a Bahtinov aid, which eventually I would like to put into the EKOS Fokus module.
The idea is the same as with the tools available in APT or the Bahtinov grabber. Since I wanted to understand the problem (and Bahtinov grabber is not very well documented) I developed my own solution in the form of a likelihood fitter.

I attach a few examples what the Bahtinov fitter can do at the moment. For the examples on the Wikipage ( en.wikipedia.org/wiki/Bahtinov_mask ) it can correctly identify the two out of focus pictures, by measuring the displacement of the center line (shown in green) with respect to the two crossing lines.
So I am quite happy and think I understand the problem well enough to start thinking about how to put this into EKOS.

If you guys can send me example shots taken with your Bahtinov mask I would be able to see how robust the fitter is. That'd be super helpful!
Also, the framework can easily be adapted to fit non-standard mask shapes. If you have one of those, please send me the specs and pictures.

If there are suggestions what you would like to see in such a feature I can try to accommodate this.

Thanks!
Sebastian
The following user(s) said Thank You: knro, Kaczorek, sywong2000, wvreeven, AstroNerd
2 months 2 weeks ago #34550
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Replied by knro on topic New Bahtinov Mask Assistant Tool

Sebastian,

This is awesome! Many users have requested this feature before. Though I am quite spoiled with the autofocusing and my bahtinov mask is collecting dust now :P
Jasem Mutlaq
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2 months 2 weeks ago #34561

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Replied by wvreeven on topic New Bahtinov Mask Assistant Tool

Sebastian,

Many thanks for this effort!!! Let me know if you need testers for the module. I'll try to collect some images and will share them with you. When I image with my Canon DSLR I always take RAW images (i.e. CR2). I hope that's not a problem?


Cheers, Wouter
Modded Canon EOS 700D with a SkyWatcher Esprit 80 ED on a SkyWatcherHEQ5-Pro

ASI1600MM-C CCD and filter wheel with an 8" TS Ritchey-Chr├ętien on a SkyWatcher EQ6-R
The following user(s) said Thank You: sneubert
2 months 2 weeks ago #34568

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Replied by sneubert on topic New Bahtinov Mask Assistant Tool

Hi Wouter,

Canon raw files should be fine. I'll need to learn to work with FITSIO anyhow, which can handle them. For initial testing I can just convert them myself.

Cheers, Sebastian
2 months 2 weeks ago #34571

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Replied by knro on topic New Bahtinov Mask Assistant Tool

The focus module switches the mode to FITS when it captures images from DSLRs so you don't need to worry about converting them.
Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
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2 months 2 weeks ago #34572

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Replied by sywong2000 on topic New Bahtinov Mask Assistant Tool

Awesome!! most wanted feature!!!
2 months 2 weeks ago #34573

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Replied by sneubert on topic New Bahtinov Mask Assistant Tool

Hi Jasem,

I'll need to make an option to import pictures into EKOS for testing purposes, I guess I can copy how that is done in the alignment module, right?
Also if you can point me to a piece of code where a FITS picture is read into a 2D array, that'd be helpful.

Thanks, Sebastian
2 months 2 weeks ago #34574

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Replied by Ihoujin on topic New Bahtinov Mask Assistant Tool

Fantastic! I have been hoping to see this one day. I have a number of bahtinov examples to share since I've been producing masks made from acrylic for people. I will also point you to this tool Maskulator To simulate bahtinov masks.

Here are a bunch of assorted bahtinov mask samples.
Dropbox Samples

Hope these help.

Andrew.
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
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2 months 2 weeks ago #34600

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Replied by sneubert on topic New Bahtinov Mask Assistant Tool

Dear Andrew,

This is exactly what I was looking for. Many thanks!!

Sebastian
2 months 2 weeks ago #34605

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Replied by totoantibes on topic New Bahtinov Mask Assistant Tool

note that APT has already built in this module: ideiki.com/astro/usersguide/bahtinov_aid.htm maybe this iswhere the idea iscoming from
2 months 2 weeks ago #34630

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Replied by sneubert on topic New Bahtinov Mask Assistant Tool

Indeed as I wrote above APT is one of the inspirations for this.
I'd be curious for suggestions how we can be better than APT. E.g. the two circles that indicate the Focus error in APT.. are they really useful? Why use circles here? What is measured is just a single number.
Instead what I want to provide is an uncertainty of the measurement, so that the user sees when they have reached the sensitivity of the method and further tuning becomes pointless.
This can be expressed visually through a "Focus achieved" message.

BTW: is color vision deficiency (CVD) a design consideration in KStars? Might be an issue when we use differently colored indicators.

Cheers, Sebastian
2 months 2 weeks ago #34633

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Replied by Ihoujin on topic New Bahtinov Mask Assistant Tool

I believe the circles in Bahtinov Grabber / APT implementation show a scaled up magnitude of error and whether it is inside or outside focus. It's intuitive enough to get the circles to overlap as much as possible. The software is also capable of averaging over a number of frames to combat seeing conditions.
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
2 months 2 weeks ago #34651

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