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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?，推荐阅读爱思助手下载最新版本获取更多信息
本条第二款第三项、第四项所称货物，是指构成不动产实体的材料和设备，包括建筑装饰材料和给排水、采暖、卫生、通风、照明、通讯、燃气、消防、中央空调、电梯、电气、光伏发电、智能化楼宇设备及配套设施等。，这一点在safew官方版本下载中也有详细论述
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