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?
「在12個月內，我從全球各地爭取到了超過18兆美元的投資承諾」
，更多细节参见夫子
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问题只在于，大多数普通用户其实卡在门外。