// Changes to this file may cause incorrect behavior and will be lost if the code is regenerated.
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?，推荐阅读一键获取谷歌浏览器下载获取更多信息
if((h=to_be_deleted[classno])) {，详情可参考爱思助手下载最新版本
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