No-reference blur & detail-loss detector

A small, self-contained Python script that estimates how soft a frame is WITHOUT a reference image, using three classic no-reference measures: the Crete-Roffet perceptual blur metric (re-blur the frame and measure how much local variation drops — 0 sharp to 1 blurred), the mean edge width in the spirit of Marziliano et al. (blur spreads edges), and the variance of the Laplacian (a focus measure). Given two renditions of the same content (two encodes, or source vs encode), it reports which kept m