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Table 8 RMSD of positional errors of the L x detector for the ideal slopes

From: A one-dimensional slope detection approach

Pre-smooth

Erf

Tanh

Sigmoid

Ramp

Step

Arctan

0

0.2859

0.2859

0.2861

16.9743

-

0.2859

1

0.2859

0.2859

0.2861

14.3276

0.5836

0.2859

2

0.2859

0.2859

0.2861

10.8449

0.5857

0.2860

4

0.2859

0.2859

0.2861

4.2151

0.5558

0.2860