Noise related

[twomol]

Hi Rys:
You said "FSR's algorithm can potentially exacerbate high frequency input".
So does the following steps theoretically help(I don't have access to the render pipe, only the final render result):

1. Apply Fourier Transform on the target to remove high frequency part
2. Apply FSR
3. put high frequency part back to the target

[brunogm0]

http://johncostella.com/magic/mks.pdf

At least use the Fourier analysis like the paper above to check Spectral Energy Leakage form padding, filter kernel.
Maybe then try to "noise shaping" like in audio aplications.