New technique to denoise noisy Mandelbulb3d images

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Offline Fraktalist

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« on: January 24, 2018, 05:46:53 PM »
I just read this great discovery by Julius Horsthuis on Facebook, great Info, so I mirror it here for those who don't use Facebook:

JH:"Rendering an animation with these parameters, I accidentally rendered extra frames with no moving camera.
Stacking these (40) redundant frames together is the ultimate denoising algorithm, making the transparency effect very convincing."

Question:" Curious, when you say you stacked them, do you mean in something like photoshop? Did the grain vary on each frame so it kind of averages and fills things out?"

JH:"Horsthuis Yes, the noise is different in each frame, otherwise it wouldn't work.
It could probably be done in Photoshop, but I used After Effects. I used the Echo effect, with 'add' function. Then an exposure to adjust the brightness back to normal"

Attached is the image.

All credits go to Julius who keeps pushing the boundaries!
« Last Edit: January 24, 2018, 07:38:14 PM by Fraktalist »

Offline 1Maniac

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« Reply #1 on: January 24, 2018, 05:52:48 PM »
Tips from a Master!!!

Offline claude

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« Reply #2 on: January 24, 2018, 06:11:19 PM »
Fragmentarium has had progressive rendering with multiple subframes that are averaged together for years.  You still need to design your script to make use of the subframe index to get any benefit, but the bundled Progressive2D does this, presumably th e 3D ray tracers do it too.  Would be cool if this rediscovery would be ported to the software to make it better for everyone.

Offline Fraktalist

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« Reply #3 on: January 24, 2018, 07:37:49 PM »
damn. and I still haven't had a close look at fragmentarium. just too many good programs and stuff to do - and only so little time.

thanks for pointing that out!
the whole concept reminds me of the buddhabrot technique.

Offline WAUthethird

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« Reply #4 on: January 26, 2018, 05:29:31 AM »
Ahhh, yes! Thanks! And I thought I was going to have to render all my frames in Monte-Carlo mode... :))

Offline Bill Snowzell

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« Reply #5 on: February 16, 2018, 04:21:22 PM »
Since the onset of digital imaging the astronomy world has been stacking raw frames for a few years including noise free dark frame subtraction. There is free software out there though it tends to use "raw" format camera  images though other formats could be used. I used to use a program called astro stacker in my stargazing days.

Offline fractal aesthetics

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« Reply #6 on: June 18, 2018, 05:06:35 AM »
To do this in photoshop:
1. Add the (almost) identical renders to a single file on seperate layers
2. Select all layers and convert to a smart object
3. Layer > Smart Object > Stack Mode > Median

This is very useful for reflections as they are often messy. You will need around 5 renders to really see a significant increase in quality. I'm not sure if this is more time efficient than just lowering the raystep multiplier, perhaps I'll do some testing...

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