`skimage.exposure.exposure:adjust_sigmoid`

source: /dev/scikit-image/src/skimage/exposure/exposure.py :735

Signature

def adjust_sigmoid ( image , cutoff = 0.5 , gain = 10 , inv = False )

Summary

Performs Sigmoid Correction on the input image.

Extended Summary

Also known as Contrast Adjustment. This function transforms the input image pixelwise according to the equation O = 1/(1 + exp*(gain*(cutoff - I))) after scaling each pixel to the range 0 to 1.

Parameters

image : ndarray: Input image.
cutoff : float, optional: Cutoff of the sigmoid function that shifts the characteristic curve in horizontal direction. Default value is 0.5.
gain : float, optional: The constant multiplier in exponential's power of sigmoid function. Default value is 10.
inv : bool, optional: If True, returns the negative sigmoid correction. Defaults to False.

Returns

out : ndarray: Sigmoid corrected output image.

Aliases

skimage.exposure.adjust_sigmoid

Referenced by

This package

release_notes:release_0.16