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Thirty bin feature vector histograms of Channel 4 outputs for Tc (left) and Tl (right) for defect types 1 (top, anterior defect with 5% extent and 50% severity) and 2 (bottom, inferior defect with 5% extent and 50% severity) using 5 iterations (4 subsets/iteration) and a cutoff frequency of 0.1 pixel−1.
