Given is a frame of a video taken with a lens focussing on the background, so the foreground is slightly blurred.

How to determine the decrease of resolution in per cent necessary for the blurred areas in all or most frames to appear sharp?

My approach:

  1. Determine blurried areas(How?)
  2. Average to determine an average amount of blurriness, for instance 4 pixels should be one.
  3. Divide the resolution by 4.

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