Sigmoid

Class: NodeSigmoidFilter

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Computes the sigmoid function pixel-wise. A linear transformation is applied first on the argument of the sigmoid function. The resulting total transform is given by

f(x) = (Max-Min) * 1/(1+e^( -(x - beta) / alpha )) + Min

Every output pixel is equal to f(x). Where x is the intensity of the homologous input pixel, and alpha and beta are user-provided constants.

Inputs

Image

input image.

Type: Image4DFloat, Required, Single

Outputs

Output

Resulting image.

Type: Image4DFloat

Settings

Alpha Number

Alpha parameter.

Beta Number

Beta parameter.

Output Maximum Number

Output max value.

Output Minimum Number

Output min value.

References

  1. “The Insight Segmentation and Registration Toolkit” www.itk.org