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The effect of the sizes of the inner filter kernels (M2 and M3) on the prescreening performance. The Hessian multiscale filters were fixed at {σ} = {0.20 mm, 0.25 mm, 0.35 mm}. The outer filter kernel M1 was set to be 0.3, 0.7, and 0.11 mm in Figs. 7(a)–7(c), respectively.
