noise reduction?
- The Unknown
- Posts: 43
- Joined: Sat Aug 04, 2007 3:15 am
- Location: Germany
noise reduction?
Hi,
is it possible to speed up the noise reduction with the following method:
1. start rendering a scene
2. store a image with sample per pixel 1000 and 1500
3. calculating the difference of each pixel
4. pixels with large difference will be rendered more (for a while)
5. repeat the algorithm after spp x
For example:
I have a room with a big window. The outside looks good and
needs no further calculation (no visible changes).
Is it possible to use the calculation for other pixels now.
is it possible to speed up the noise reduction with the following method:
1. start rendering a scene
2. store a image with sample per pixel 1000 and 1500
3. calculating the difference of each pixel
4. pixels with large difference will be rendered more (for a while)
5. repeat the algorithm after spp x
For example:
I have a room with a big window. The outside looks good and
needs no further calculation (no visible changes).
Is it possible to use the calculation for other pixels now.
I'm not so sure about this... maybe Ono could drop some lines about this topic.IanC wrote:That would be like importance sampling, which I'm pretty sure is already implemented.
Hereis an older Thread, that describes importance sampling and links to the related paper...
polygonmanufaktur.de
- deltaepsylon
- Posts: 417
- Joined: Tue Jan 09, 2007 11:50 pm
He He.... the Idea behind this is to focus Render Power of Indigo on noisy parts of a Scenedeltaepsylon wrote:interesting... but i think noise reduction should be in the form of a separate as-easy-to-use-as-indigo app. Remember, indigo is a renderer, not a renderer-&-noise-reducer
(like for example caustics or SSS objects),
and NOT to do a denoise Filter or stuff
polygonmanufaktur.de
yeah I agree, definitely some need for weighted rendering because caustics are the last thing to be fully rendered and they take forever!
Probably due to the fact that even if the rest of the scene is already clean they are still receiving samples, where they should be directed to the caustics area
I know in Maxwell, caustics show within the first few minutes and are already pretty full even then
Probably due to the fact that even if the rest of the scene is already clean they are still receiving samples, where they should be directed to the caustics area
I know in Maxwell, caustics show within the first few minutes and are already pretty full even then
As far as it was discussed in the old Forum, it seems to be an technique that is used for animated content...CoolColJ wrote:maybe something like delta sampling - whatever it is
http://www.hungrycat.hu/DeltaSampling.html
polygonmanufaktur.de
- The Unknown
- Posts: 43
- Joined: Sat Aug 04, 2007 3:15 am
- Location: Germany
from 2 years ago, maybe it will be ready right about nowZomB wrote:As far as it was discussed in the old Forum, it seems to be an technique that is used for animated content...CoolColJ wrote:maybe something like delta sampling - whatever it is
http://www.hungrycat.hu/DeltaSampling.html
Thank you for your good words about Hungry Cat.
The pictures have been made without noise filtering or photoshopping or any post processing. (Except gamma-correction on some cases.) There you can see the pure unbiased output.
Actually computation time data say practically nothing, because Hungry Cat is not finished yet. The public version will be equipped with Delta Sampling, which avoids the brute forcing.
Best Regards
Csaba Kelemen
Fund that about delta-sigma modulation, the word unbiased is here again (?)
http://www.sciencedirect.com/science?_o ... ab6ba7fb31
Can't pretend I'm understanding, but looks like delta-sigma modulation allows to oversample signal for fine noise analyse, then a band-pass filter is used to retain relevant color information (ie noiseless colors).
Someone's got a better explanation (or a correct one ) ?
http://www.sciencedirect.com/science?_o ... ab6ba7fb31
Can't pretend I'm understanding, but looks like delta-sigma modulation allows to oversample signal for fine noise analyse, then a band-pass filter is used to retain relevant color information (ie noiseless colors).
Someone's got a better explanation (or a correct one ) ?
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