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?
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前大埔區議員姚鈞豪曾在社交媒體發文，批評政府問卷未提及不同安置方案的詳情，認為內容誤導，不贊成以此來收集意見。
Nov 25, 2025: Google initially determined this behavior was intended. We pushed back.