SSIM (Structural Similarity Index Measure) compares two images by evaluating luminance, contrast, and structural patterns across local windows. It returns a score from -1 to 1: 1.0 means the images are pixel-identical, 0 means no structural correlation, and negative values mean the images are anti-correlated (less alike than random noise). For glyph comparison, it answers the question: do these two rendered characters share the same visual structure?
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Rolls-Royce, the engine-maker and defence firm that is spitting out so much cash it can shove £7bn to £9bn towards buying back shares over the next three years, would like UK taxpayers to find a few quid – reportedly up to £200m as a first slug – to help fund one its big bets. The company would “appreciate” financial support from the government to smooth work on a new engine, says its chief executive, Tufan Erginbilgiç.，这一点在im钱包官方下载中也有详细论述
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10127-0