Accumulation buffer/Moving Average - how?

pandy · 3rd June 2014, 15:29

Struggle with this from some time and i stuck without clue how to do Accumulation Buffer/Moving Averaging in temporal domain (or kind of infinite/long time persistence buffer).

http://en.wikipedia.org/wiki/Moving_average

In simple words - how to add all (or some reasonable but long sequence) of frames to create one frame (properly scaled - similar to HDR imaging)?

StainlessS · 3rd June 2014, 16:11

Some links that might be of interest.

http://forum.doom9.org/showthread.php?t=168001

http://forum.doom9.org/showthread.ph...42#post1632542

http://forum.doom9.org/showthread.php?t=168293
(where Multiplier arg = 0.0)

http://forum.doom9.org/showthread.ph...nd#post1643168

pandy · 3rd June 2014, 16:37

ClipBlend/ClipBlend16 looks very promising,
Thank You StainlessS! (and also Gavino for GScript).

StainlessS · 3rd June 2014, 16:57

Clipblend, blends all frames played so far (when Delay=0), with equal weight.

RGBAmplifier averages frames either side of target frame (with radius 'rad') when multiplier == 0.0.

Is equal weight blending sufficient for your needs ?

pandy · 3rd June 2014, 17:04

Quote:

Originally Posted by StainlessS

Clipblend, blends all frames played so far (when Delay=0), with equal weight.

RGBAmplifier averages frames either side of target frame (with radius 'rad') when multiplier == 0.0.

Is equal weight blending sufficient for your needs ?

It should be sufficient - my purpose is to extract purely static part and ignore motion.

PS
I would investigate also RGBAmplifier but it seem to be more complex as probably more universal tool - not sure that i need this part.

Btw Avisynth it is just proof of concept - target application will be probably not based on Avisynth.

--after being hit by brilliant idea of the StainlessS mind--

Quote:

Originally Posted by StainlessS

Clipblend, blends all frames played so far (when Delay=0), with equal weight.

RGBAmplifier averages frames either side of target frame (with radius 'rad') when multiplier == 0.0.

Is equal weight blending sufficient for your needs ?

RGBAmplifier is perfect for my needs - thank You once again!!!

StainlessS · 3rd June 2014, 19:04

You're welcome.

Thankyou for the link on moving averages.
I think I'm gonna try to implement "exponential moving average, with \alpha=1/N" under "Modified moving average" in your link.

Will only be implemented for ClipBlend where delay is non zero (where delay is N in '1/N' above) .

pandy · 4th June 2014, 09:14

Quote:

Originally Posted by StainlessS

You're welcome.

Thankyou for the link on moving averages.
I think I'm gonna try to implement "exponential moving average, with \alpha=1/N" under "Modified moving average" in your link.

Will only be implemented for ClipBlend where delay is non zero (where delay is N in '1/N' above) .

It can be nice feature especially for motion/static video part separation which is my goal - i need to remove as much as possible video from overlayed as semitransperent text and pictures (typical UI).
This for testing automation - proof of concept to simulate and to show developers ways to deal with various video processing possibilities to improve automatic detection capabilities (minimize false positive/negative results).

btw i also realized that RgbAmplifier can be quite slow for large radius (such as 50 for example i.e. 2 sec for 25fps video) - also seem that for radius=99 is sometimes not enough to average motion completely (for example looks like 250 i.e. 10 sec can be sometimes required).
I miss also offset settings - to stack multiple RgbAmplifier instances.

Anyway it works - thank You once again!

StainlessS · 22nd June 2017, 15:01

Bumping this old thread to just point out to Pandy that DavidHorman did an alternative plug to RgbAmplifier, which supports YUV, ie Amp().
here:- https://forum.doom9.org/showthread.p...32#post1703332

EDIT: About 6 months after his last post.

pandy · 24th November 2017, 10:15

Quote:

Originally Posted by StainlessS

Bumping this old thread to just point out to Pandy that DavidHorman did an alternative plug to RgbAmplifier, which supports YUV, ie Amp().
here:- https://forum.doom9.org/showthread.p...32#post1703332

EDIT: About 6 months after his last post.

Once again big thx StainlessS! Your work is very appreciated.
Cheers.

3rd June 2014, 15:29	#1 \| Link
pandy Registered User Join Date: Mar 2006 Posts: 1,049	Accumulation buffer/Moving Average - how? Struggle with this from some time and i stuck without clue how to do Accumulation Buffer/Moving Averaging in temporal domain (or kind of infinite/long time persistence buffer). http://en.wikipedia.org/wiki/Moving_average In simple words - how to add all (or some reasonable but long sequence) of frames to create one frame (properly scaled - similar to HDR imaging)?

3rd June 2014, 16:11	#2 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,980	Some links that might be of interest. http://forum.doom9.org/showthread.php?t=168001 http://forum.doom9.org/showthread.ph...42#post1632542 http://forum.doom9.org/showthread.php?t=168293 (where Multiplier arg = 0.0) http://forum.doom9.org/showthread.ph...nd#post1643168 __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 3rd June 2014 at 16:30.

3rd June 2014, 16:57	#4 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,980	Clipblend, blends all frames played so far (when Delay=0), with equal weight. RGBAmplifier averages frames either side of target frame (with radius 'rad') when multiplier == 0.0. Is equal weight blending sufficient for your needs ? __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

3rd June 2014, 19:04	#6 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,980	You're welcome. Thankyou for the link on moving averages. I think I'm gonna try to implement "exponential moving average, with \alpha=1/N" under "Modified moving average" in your link. Will only be implemented for ClipBlend where delay is non zero (where delay is N in '1/N' above) . __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

22nd June 2017, 15:01	#8 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,980	Bumping this old thread to just point out to Pandy that DavidHorman did an alternative plug to RgbAmplifier, which supports YUV, ie Amp(). here:- https://forum.doom9.org/showthread.p...32#post1703332 EDIT: About 6 months after his last post. __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 22nd June 2017 at 22:45.

3rd June 2014, 16:37	#3 \| Link
pandy Registered User Join Date: Mar 2006 Posts: 1,049	ClipBlend/ClipBlend16 looks very promising, Thank You StainlessS! (and also Gavino for GScript).