threshold-otsu

threshold_otsu

skimage.filters.threshold_otsu(image, nbins=256) [source]

Return threshold value based on Otsu’s method.

Parameters:	image : array Grayscale input image. nbins : int, optional Number of bins used to calculate histogram. This value is ignored for integer arrays.
Returns:	threshold : float Upper threshold value. All pixels intensities that less or equal of this value assumed as foreground.

Notes

The input image must be grayscale.

References

[R206]

Wikipedia, http://en.wikipedia.org/wiki/Otsu’s_Method

Examples

>>> from skimage.data import camera
>>> image = camera()
>>> thresh = threshold_otsu(image)
>>> binary = image <= thresh