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INDI Library v2.0.7 is Released (01 Apr 2024)

Bi-monthly release with minor bug fixes and improvements

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Lost star when dithering causes capture module to hang

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Replied by Rob Lancaster on topic Lost star when dithering causes capture module to hang

I have a better question. How can a random dither always move in the same direction? That sounds like a bug to me. . .
5 years 9 months ago #26767

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Replied by Jasem Mutlaq on topic Lost star when dithering causes capture module to hang

Well, randomness is not truely random in computers, but still it would be odd to _always_ move in the same direction. I guess an invisible protection zone can be arbitrarily defined to bound the star to it to ensure it doesn't stray too far off.
5 years 9 months ago #26772

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Replied by Alfred on topic Lost star when dithering causes capture module to hang

This is from my most recent session. To me the dithering direction doesn't look random at all.
Last edit: 5 years 9 months ago by Alfred.
5 years 9 months ago #26775
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Replied by Alfred on topic Lost star when dithering causes capture module to hang

Another picture (taken weeks ago) using 2,8 pixel dithering resulting in "noise rain" also shows dithering always goes in one direction.
Last edit: 5 years 9 months ago by Alfred.
5 years 9 months ago #26776
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Replied by Alfred on topic Lost star when dithering causes capture module to hang

What strikes me is the factt that not only goes dithering in one and the same direction during a job. It appears to remain the same during the whole night.
Last edit: 5 years 9 months ago by Alfred.
5 years 9 months ago #26778

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Replied by Jasem Mutlaq on topic Lost star when dithering causes capture module to hang

Thanks, I just pushed a fix for the not-so-random dither and used different algorithm and add a bounded area. Please try the nightly build or wait for next release.
The following user(s) said Thank You: nMAC, Alfred
5 years 9 months ago #26784

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Replied by Kevin Ross on topic Lost star when dithering causes capture module to hang


That's quite odd, since for me with 10 pixel dithering it does move in a different direction each time.
5 years 9 months ago #26796

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Replied by nMAC on topic Lost star when dithering causes capture module to hang

Backlash... could it be the cause? Even with 10 pixels movement?
My results are mixed. Sometimes it goes always in the same direction. And suddenly,then it change directions.
I have to test the new build.
5 years 9 months ago #26804

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Replied by Alfred on topic Lost star when dithering causes capture module to hang

Odd, indeed. But what can I say, it always moves in the same direction here as evidenced by the pictures I posted. I should have a chance to test the new build tonight. Backlash is not an issue with this mount.
5 years 9 months ago #26805

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Replied by Alfred on topic Lost star when dithering causes capture module to hang

Just ended tonight's session. Certainly useless to target nebulae at full moon but I wanted to test the new build. I updated nightlies just before I started the session. Here is the result of two 6-lights jobs. I don't see much improvement.
5 years 9 months ago #26832
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Replied by Alfred on topic Lost star when dithering causes capture module to hang

That was done using KStars bleeding 2018-06-25. Just a few minutes ago version 2018-06-26 arrived. So I assume I used one that did not provide the dither "random" fix?
5 years 9 months ago #26833

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Replied by Kevin Ross on topic Lost star when dithering causes capture module to hang

Well, here's the commit messge:
commit 6e4d0c918463b34bc3dc202a1ef28432c08de4fd
Author: Jasem Mutlaq <mutlaqja@ikarustech.com>
Date:   Mon Jun 25 20:46:45 2018 +0300
 
    Fix random dithering not being not so random, plus limit it to 25 pixels box

So it was committed Jun 25, at 20:46 +0300. Was your build built before or after that?
Last edit: 5 years 9 months ago by Kevin Ross.
5 years 9 months ago #26835

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