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Table 9 RMSD of positional errors of the proposed detector for the ideal slopes

From: A one-dimensional slope detection approach

Pre-smooth	Erf	Tanh	Sigmoid	Ramp	Step	Arctan
0	0.0092	0.0157	0.1024	0.2116	-	0.0686
1	0.0067	0.0094	0.1024	0.2068	0.3706	0.0682
2	0.0040	0.0049	0.1024	0.2094	0.2950	0.0681
4	0.0018	0.0021	0.1052	0.2065	0.2913	0.0683

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