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Table 13 RMSD of positional errors of the proposed detector for the sparsely sampled ideal slopes

From: A one-dimensional slope detection approach

Pre-smooth Erf Tanh Sigmoid Ramp Step Arctan
0 0.1004 0.0615 0.2323 0.2547 - 0.0692
1 0.0946 0.0484 0.2421 0.2353 0.3519 0.0665
4 0.3529 0.2818 0.7248 0.2840 0.2932 0.4723