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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Navigate to APIs & Services > Credentials. Check each API key's configuration. You're looking for two types of keys:
Both sides are reporting they have inflicted heavy casualties on each other, but it is difficult to know the true numbers when they are presenting sharply divergent figures.