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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?
。im钱包官方下载是该领域的重要参考
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pixel[0] = pixel[0] 0.0031308f ? 1.055f * powf(pixel[0], 1.0f / 2.4f) - 0.055f : 12.92f * pixel[0];