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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?，这一点在搜狗输入法2026中也有详细论述
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The Somerset couple set off in October last year, but after a stress fracture for Langley-Wathen, they were forced to stop after covering just 60 miles.，更多细节参见safew官方版本下载
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