Publication date: 10 March 2026
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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2024 年年初，美国某仓库里，工人们把一本本新书送进机器，切掉书脊，扫描，然后把纸送去回收。下令做这件事的是 Anthropic，项目内部代号「巴拿马」，目标是以破坏性方式扫描全球所有书籍——Anthropic不希望外界知道他们做了这件事。
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