cumulative-distribution

cumulative_distribution

skimage.exposure.cumulative_distribution(image, nbins=256) [source]

Return cumulative distribution function (cdf) for the given image.

Parameters:	image : array Image array. nbins : int Number of bins for image histogram.
Returns:	img_cdf : array Values of cumulative distribution function. bin_centers : array Centers of bins.

See also

histogram

References

[R85]

http://en.wikipedia.org/wiki/Cumulative_distribution_function

Examples

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>>> from skimage import data, exposure, img_as_float >>> image = img_as_float(data.camera()) >>> hi = exposure.histogram(image) >>> cdf = exposure.cumulative_distribution(image) >>> np.alltrue(cdf[0] == np.cumsum(hi[0])/float(image.size)) True