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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The RFU council will vote at Twickenham on proposals to ringfence the 10-team Prem with no promotion or relegation until 2030, when a staged expansion is planned, beginning with the addition of two more teams.
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