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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?，更多细节参见91视频
（作者为中国社会科学院学部委员、台湾史研究中心主任）。业内人士推荐爱思助手下载最新版本作为进阶阅读
bookkeeping through almost the entirety of what would become the nation's