Denoiser parameters?

[MrTroy]

I've been doing video encoding for years, but it wasn't until recently that I started dealing with noisy video. So denoising is something I don't know much about.

The parameters AviSynth denoisers have are a mystery to me. Right now what I'm doing is just 'guessing' values for the different options, and in the end I usually manage to create a decent result. But I can't say I know what I'm doing.

For instance, eDeen allows the following parameters to be specified:
- radius
- Y and UV thresholds
- Y and UV lowratios

Could anyone explain what they mean, or point me toward a website with information about it? And more importantly, what effect they have on the outcome. I mean, e.g., in what case do I need high radius, when do I need high Y threshold but low UV thresh, etc.

I know it's kind of a newbish question, but I thought this to be too specific to be in the Newbie subforum.
Sorry if there already are loads of threads about this; I couldn't find them.

[Heini011]

Hi,


- Y and UV thresholds

Y= luminance values

max luminance threshold for pixels to be used for averaging, viewed from every origin pixel.


UV = chroma values

- Y and UV lowratios

you can tell edeen to use lower threshold limits for averaging at the end of the radius, viewed from every origin pixel.

- radius

max distance for pixels to be used for averaging.

the higher the values of the thresholds, the more striking textures would be blurred. with radius you can determine how far-ranging this effect is.

start with radius = 1 or for a low quality film with radius = 2. increase thresholds (initial Y=UV = low ratios) until best noise removing or best detail-blurring/noise ratio is reached. try a higher threshold and then try lower low-ratios and so on...


greetings

[MrTroy]

Thanks Heini011. I had to reread your post several times, but I completely understand it now. :thanks: