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?
上世纪90年代初，福建省领导科学研究会曾邀时任宁德地委书记习近平对青年领导干部谈谈如何干好工作的问题，一篇《从政杂谈》引经据典、发人深省——
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"We like time to free up our mind. I get the best ideas when I walk my dog," says Marieke Pepers, chief people officer at the Dutch software firm Nmbrs.