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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