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Old 3rd June 2014, 15:29   #1  |  Link
pandy
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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)?
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Old 3rd June 2014, 16:11   #2  |  Link
StainlessS
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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
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"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.
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Old 3rd June 2014, 16:37   #3  |  Link
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ClipBlend/ClipBlend16 looks very promising,
Thank You StainlessS! (and also Gavino for GScript).
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Old 3rd June 2014, 16:57   #4  |  Link
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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 ?
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Old 3rd June 2014, 17:04   #5  |  Link
pandy
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Quote:
Originally Posted by StainlessS View Post
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 View Post
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!!!

Last edited by pandy; 3rd June 2014 at 18:38.
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Old 3rd June 2014, 19:04   #6  |  Link
StainlessS
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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) .
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Old 4th June 2014, 09:14   #7  |  Link
pandy
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Quote:
Originally Posted by StainlessS View Post
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!

Last edited by pandy; 4th June 2014 at 09:22.
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Old 22nd June 2017, 15:01   #8  |  Link
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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.
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"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.
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Old 24th November 2017, 09:15   #9  |  Link
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Quote:
Originally Posted by StainlessS View Post
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.
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