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Table 2 Parameter values of the methods

From: Structure-based level set method for automatic retinal vasculature segmentation

Method Parameters
Proposed preprocessing Amplitude of the trace-based filter is 30, amplitude of the shock filter is 45, τ1 = updated at each iteration, other parameters of these filters are kept as in the related study[39], and kernel size of median filter is 25 × 25.
Log-Gabor filter[40] and modified phase map f 0 x = 3 × 2.1 x - 1 - 1 , 1 x S = 3 , σ r = log 0.55 , σ θ = 1.2 , θ 0 x , 1 x O = 8 , β = 1 , and σ q = 3
GAC[23] τ 2 = 0.2 , ϑ = 1 , and α = 0.3
PBLS[24] τ2 = updated at each iteration, ϑ = 0.07, and α = 1
DRLSE[25] τ2 = 5, σ = 1.5, μ = 0.04, ϑ = 5, α = ± 1.5, and c0 = 2
ARLS[28] τ2 = 5, σ = 1.4, μ = 0.04, ϑ = 2.7, α = ± 1, and c0 = ±1
Proposed segmentation τ2 = 1, μ = 0.2, ϑ = 0.6, α = 3, and c0 = {2, 5}
RBLSE[33] τ2 = 0.1, σ = 4, μ = 1, ϑ = 0.01 × 2552, and c0 = 1