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I did some testing of SuperRes for different resolution video files and these settings found to be quite good to my eyes.
For 1024x576 -> 1920x1080, the following settings are used
image doubling: off
Chroma upscaling: Bicubic 75 + AR + SuperRes
image upscaling: Bicubic75 + AR
image downscaling: Catmull-Rom + AR + LL
upscaling refinement: passes 2, medium, strength 0.65, sharpness 0.25, softness 0.25, anti-aliasing 0.15, anti-ringing 0.14, refine the image only once after upscaling is complete
While with 720x406 -> 1920x1080, difference with the former settings as following:
image doubling: NEDI
upscaling refinement: choose refine the image after every ~2x upscaling step produces better result, less blocky (the original compressed video has block artefacts).
Since when 1024x576 -> 1920x1080, if the image doubling was used, it ends up with a DOWNSCALING to reach the screen resolution, while 720x406 ends up with an UPSCALING, I guess similar effect might stands to videos with other resolutions.
With 1024x576 -> 1920x1080 files, the non-double defaults does not produce good quality at least for Bicubic 75 + AR upscaling. Actually I have tried SuperRes with other upscaling algorithms, including bilinear, it seems SuperRes works well with Bicubic and Bilinear, not with other algorithms, to my eyes of course.
One question, if using image doubling with 1024x576 -> 1920x1080 and 'choose refine the image after every ~2x upscaling step' is chosen with upscaling refinement settings, would the refinement been applied twice, or just once after doubling; how exactly it's working with 'refine the image only once after upscaling is complete' set to yes?
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