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Table 5 statistics of Lxs / Lx for various slope functions

From: A one-dimensional slope detection approach

Edge Min Max Mean Std
Erf 0.6381 0.6891 0.6637 0.0149
tanh 0.6169 0.9932 0.6488 0.0503
sigmoid 0.4503 0.6705 0.6398 0.0193
ramp 0.7768 0.8565 0.8134 0.0221
step 0.6429 0.6429 0.6429 0
arctan 0.5531 0.9968 0.5798 0.0522