Noise reduction?

General questions about Indigo, the scene format, rendering etc...
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CoolColJ
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Noise reduction?

Post by CoolColJ » Mon Sep 17, 2007 2:31 pm

Some links that maybe useful for Ono and others 8)

noise reduction
http://www.cgl.uwaterloo.ca/Projects/re ... /aniso.pdf

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Kram1032
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Post by Kram1032 » Tue Sep 18, 2007 4:09 am

I think, I don't want noise reduction in Indigo...
Violet is for those things and it's Open Source. Anyone can develop it :)

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CoolColJ
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Post by CoolColJ » Tue Sep 18, 2007 10:05 am

but a noise reduction process that is part of the render prcoess that does not destroy edges, textures details etc is not a bad idea IMO

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deltaepsylon
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Post by deltaepsylon » Tue Sep 18, 2007 10:15 am

as long as we don't get blurred edges, and its still (mostly) physically accurate, and its not *too* slow, im all for it.
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CoolColJ
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Post by CoolColJ » Tue Sep 18, 2007 10:57 am

well if you cna turn it on/off in the ini file then that's even better :)

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zsouthboy
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Post by zsouthboy » Tue Sep 18, 2007 11:41 am

No noise reduction.

If you want it, do it post-process.

Plenty of people smarter than us have coded noise-reduction programs - let's not reinvent the wheel.

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CoolColJ
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Post by CoolColJ » Tue Sep 18, 2007 12:16 pm

post render noise reduction is always destructive

read the paper and you will understand

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Kram1032
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Post by Kram1032 » Wed Sep 19, 2007 4:11 am

as a switch, it's ok, indeed :)
anyone can choose ones preferred way to go :D
I wonder, what's about delta-sampling :)

they also do it "post process"... I guess, it would slow down the render quite a lot...

the pics have quite bad Aliasing Artefacts... I wonder, if that would harm the current close-to-perfect Indigo AA...


overally, I'm not sure, if I want it...
I think, it's kinda biased...
(though, I didn't read through the whole thing...)

AA in those examples is extremely bad...
but ok. That's the case in both the noisy and the denoised pic...

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OnoSendai
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Post by OnoSendai » Wed Sep 19, 2007 4:13 am

The images in that paper have that horrible water-colour like effect which so many noise reduction algs tend to have.

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zsouthboy
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Post by zsouthboy » Wed Sep 19, 2007 6:21 am

OnoSendai wrote:The images in that paper have that horrible water-colour like effect which so many noise reduction algs tend to have.
Yeah - I love it.

"OMG NO NOISE!11" - Yeah, but your image is now a smudgy piece of shit.

See also: point and shoot cameras above ISO 100.

At least Indigo isn't any chroma noise (blotchy reds and blues and greens), like those though.

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Kram1032
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Post by Kram1032 » Wed Sep 19, 2007 6:31 am

yeah...
I still wonder, what's about delta sampling, and why the idea died...

there are some renders, starting with coloured noise to get clearer and clearer...

maybe, that's one of them^^

(although, it's definitely quite a low quality one...)

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