bundles / skimage latest / skimage / exposure / exposure / adjust_sigmoid
function
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: ndarrayInput image.
cutoff: float, optionalCutoff of the sigmoid function that shifts the characteristic curve in horizontal direction. Default value is 0.5.
gain: float, optionalThe constant multiplier in exponential's power of sigmoid function. Default value is 10.
inv: bool, optionalIf True, returns the negative sigmoid correction. Defaults to False.
Returns
out: ndarraySigmoid corrected output image.
See also
Aliases
skimage.exposure.adjust_sigmoid