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DigitalPrintPrint + Digital
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2026-02-28 00:00:00:03014274610http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142746.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142746.html11921 本版责编：程 红
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?