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The feature integration, Gabor masks, and structure detection near artery bifurcation. (a) illustrates circular pattern detector and feature integration. (b) is an examples of five Gabor masks, and their parameters, where (b1) T1 = 5, θ1 = π/2, f1 = 0.2; (b2) T2 = 9, θ2 = π/2, f2 = 0.111; (b3) T3 = 13, θ3 = π/2, f3 = 0.077; (b4) T4 = 9, θ4 = 3π/4, f4 = 0.111; (b5) T5 = 5, θ5 = 3π/4, f5 = 0.2. (c) illustrates the problem of the uncertainty of the node positions.
