`skimage.filters.rank.generic:threshold`

source: /dev/scikit-image/src/skimage/filters/rank/generic.py :1325

Signature

   def     threshold (    image    ,    footprint    ,    out    =  None   ,    mask    =  None   ,    shift_x    =  0   ,    shift_y    =  0   ,    shift_z    =  0     )

Summary

Local threshold of an image.

Extended Summary

The resulting binary mask is True if the gray value of the center pixel is greater than the local mean.

Parameters

image : ndarray of shape ([P,] M, N) and dtype (uint8 or uint16): Input image.
footprint : ndarray: The neighborhood expressed as an ndarray of 1's and 0's.
out : ndarray of shape ([P,] M, N), same dtype as input `image`: If None, a new array is allocated.
mask : ndarray of dtype (int or float), optional: Mask array that defines (>0) area of the image included in the local neighborhood. If None, the complete image is used (default).
shift_x, shift_y, shift_z : int: Offset added to the footprint center point. Shift is bounded to the footprint sizes (center must be inside the given footprint).

Returns

out : ndarray of shape ([P,] M, N), same dtype as input `image`: Output image.

Examples

from skimage.morphology import footprint_rectangle # Need to add 3D example
from skimage.filters.rank import threshold
img = 255 * np.array([[0, 0, 0, 0, 0],
                      [0, 1, 1, 1, 0],
                      [0, 1, 1, 1, 0],
                      [0, 1, 1, 1, 0],
                      [0, 0, 0, 0, 0]], dtype=np.uint8)
threshold(img, footprint_rectangle((3, 3)))

✓

Aliases

skimage.filters.rank.threshold