CPU Denoiser Documentation

Hello,

I am trying to use the denoiser combined to the path tracing , but the denoising is too strong and I end up losing a lot of details.

Not expert of the OID , and I would like to know if there is a documentation about the console variables , because in the official doc , I find it a little bit light for an artist trying to adjust the values , example

"
r.PathTracing.TemporalDenoiser.DeltaE :
Cut off the history weight to zero at CIE DeltaE for low frequency1.0 :the just noticeable difference (JND)2.0 :perceptible for close loo10.0:Perceptible at a glance This works as an alternative control instead of kappa. 2 as default.
"

What is the history weight ? What is CIE DeltaE ? What is JND 2.0 ? What is kappa ?

Is there a doc that explains in details these kind of values to adjust the denoise ?
Even in the official Intel Open Image Denoise doc I don’t find these informations
https://www.openimagedenoise.org/documentation.html

Thanks a lot for your help