What determines the quality of the AutoStakkert graphics?

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OlegLviv
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What determines the quality of the AutoStakkert graphics?

Post by OlegLviv »

Mainly Early morning 08-10 a.m have a good seeing when saw sun and capture in my laptop :movie try do good focus and expose evenly etalon and polar good for 6000-8500mm focal lenth......but my quality graphic not good.....

What happends????

What determines the quality of the AutoStakkert graphics?

1.Very good focusing?
2.Very good polar alight?
3.Good telescope balancing?
4.Maybe 3000 or 5000 frames its more?

Thank you!
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Re: What determines the quality of the AutoStakkert graphics?

Post by MalVeauX »

Hi,

Contrast. The quality weight on each frame is based on contrast calcs.

It can be fooled, if you have steady bad seeing and a dark limb involved, it may show a high quality graph because all the frames had a similar contrast level with very little variation, but the limb itself provides a huge amount of weight to the calculation and in bad seeing with no good frames, it will appear like a high quality graph with little variation (your 2nd image).

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Re: What determines the quality of the AutoStakkert graphics?

Post by Radon86 »

MalVeauX wrote: Tue Sep 06, 2022 2:41 pm Hi,

Contrast. The quality weight on each frame is based on contrast calcs.

It can be fooled, if you have steady bad seeing and a dark limb involved, it may show a high quality graph because all the frames had a similar contrast level with very little variation, but the limb itself provides a huge amount of weight to the calculation and in bad seeing with no good frames, it will appear like a high quality graph with little variation (your 2nd image).

Very best,
Thanks Marty, something else I did not know !

Magnus


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Re: What determines the quality of the AutoStakkert graphics?

Post by OlegLviv »

MalVeauX
When have a good contrast?
When histogram more 75%?
Or when have unity gain (apollo max m 145 gain unity ?)
Or when have more fps 90-100 but big gain and less ms?
Or when have less fps 50-85 but more ms and unity gain?
Thanks


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Re: What determines the quality of the AutoStakkert graphics?

Post by MalVeauX »

OlegLviv wrote: Tue Sep 06, 2022 6:32 pm MalVeauX
When have a good contrast?
When histogram more 75%?
Or when have unity gain (apollo max m 145 gain unity ?)
Or when have more fps 90-100 but big gain and less ms?
Or when have less fps 50-85 but more ms and unity gain?
Thanks
The contrast is a value from analytics of the data itself. Take an AP box of anywhere in your data across several frames and there are calculations under the hood that are analyzing the values and assigning a contrast weight to it. The more difference there is between pixel brightness, the more contrast will be computed. If there's no difference in brightness from pixel to pixel, the result is a low contrast, no contrast basically, block of solid greytone. So when seeing is very good, features will have less blur, and so there will be a rapid change in brightness between features, resulting in high contrast values. When seeing is poor, there is more blur, there is more gradient from brightness to darkness on features, so the contrast is lower, and the resulting value will be lower.

The graph merely breaks up the reported data summary after analyzing it into 4 rows and 4 columns, so that you can easily visually see 25% increments of either the frame count or the suggested computed quality count. Just because something is 50% or 75% rated as quality weight via contrast calculation doesn't mean it's actually high quality--just that it is computed to probably be.

There's zero benefit to unity gain or any particular gain value on any of these sensors because you're not doing long exposure, you're doing short exposure video.

More FPS just means more chance to get lucky frames when seeing is good. 10ms or less exposure time is ideal to freeze seeing. More FPS is generally always a benefit for lucky imaging.

Very best,
Last edited by MalVeauX on Tue Sep 06, 2022 7:38 pm, edited 1 time in total.


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Re: What determines the quality of the AutoStakkert graphics?

Post by marktownley »

Great responses, thanks Marty


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