Idea for perfect denoising

[Mephesto]

I've been playing around with Overlay() to average out many frames into one and it gave me an idea. Noise always averages to 0 with enough iterations. What if we added noise to the already-noise ridden video, produce 20 of such videos each with a different pseudorandom seed and then combine them together. The pixels of the details will always be the same but because each video will have a noise grain in a different spot, it will average to 0 and thus became noise free.

The only obstacle I see to this is producing exactly the type of noise in the film which isn't exactly Gaussian noise but the familiar salt and pepper film grain.

What do you all think?

[newpball]

I've been playing around with Overlay() to average out many frames into one and it gave me an idea. Noise always averages to 0 with enough iterations. What if we added noise to the already-noise ridden video, produce 20 of such videos each with a different pseudorandom seed and then combine them together. The pixels of the details will always be the same but because each video will have a noise grain in a different spot, it will average to 0 and thus became noise free.

Won't work because the noise applied will not discriminate between original nose and original content. In this case you would (ideally) only be able to get the video as it was before the additional noise was added.

[jagabo]

The pixels of the details will always be the same but because each video will have a noise grain in a different spot, it will average to 0 and thus became noise free.

Yes, you will perfectly remove the noise you added. But the noise in the original source is a "detail" and will not be removed.

[Mephesto]

You're right, I just tested this out. It didn't work. DAMN IT!

It appears that this technique has been used to get rid of VHS noise though: http://www.digitalfaq.com/forum/video-restore/2734-averaging-multiple-captures.html

[newpball]

You're right, I just tested this out. It didn't work. DAMN IT!

It appears that this technique has been used to get rid of VHS noise though: http://www.digitalfaq.com/forum/video-restore/2734-averaging-multiple-captures.html

That is different from what you describe.

However muti-capture will not reduce noise it will only average out 'glitches'.

[Cornucopia]

No, it will also reduce the noise AND glitches that are incurred during playback. It will not reduce noise OR glitches that are generated (and stored) at record time.

Scott

[BÌG•bµdd]

The pixels of the details will always be the same but because each video will have a noise grain in a different spot, it will average to 0 and thus became noise free.

Yes, you will perfectly remove the noise you added. But the noise in the original source is a "detail" and will not be removed.

If if i understood u correctly , QTGMC have a option called GrainRestore that may let you play with source detail, but i think perhaps u need play with QTGMC to understand it more so you can add more code into QTGMC to get some nice output result...
btw it should look something like
ex: QTGMC(Tr2=2, Preset="slower", Grainrestore=0.2, Edithreads=2)###code can be improved

or

u have to check MCTemporalDenoise too, that may do the job in this case
here is theard for MCTD
http://forum.doom9.org/showthread.php?t=139766