Measuring image quality and stability

Measuring image quality and stability. (A) Original artwork: Pixel art of Himemori Luna and her knight mascots (Hololive Production) on a raft; (B) Blurred version after 650,000 pixel flips – the artwork's structure degrades, but the raft shape remains visible; (C) Color Distance Map: A grayscale image showing structural stability – black areas are stable, white areas are not; (D) Degradation score: Shows how the artwork's structure changes with pixel flips, compared to a completely shuffled version; (Inset in D) Color distribution: A 3D scatter plot of the 50 most frequent colors in the artwork, showing their distribution in red-green-blue space; (E) Structural stability: Defines a metric (∆S) to measure structural stability, which is maximized when the number of pixel flips is about equal to the image size.