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Table 14 RMSD of positional errors of the L x detector for the sparsely sampled ideal slopes

From: A one-dimensional slope detection approach

Pre-smooth Erf Tanh Sigmoid Ramp Step Arctan
0 0.2926 0.2926 0.2924 2.1233   - 0.2926
1 0.2926 0.2926 0.2924 0.3994 0.5738 0.2926
4 0.3206 0.3034 0.4762 0.4131 0.5649 0.3446