white_tophat(image, selem=None, out=None)
The white top hat of an image is defined as the image minus its morphological opening. This operation returns the bright spots of the image that are smaller than the structuring element.
Image array.
The neighborhood expressed as an array of 1's and 0's. If None, use cross-shaped structuring element (connectivity=1).
The array to store the result of the morphology. If None is passed, a new array will be allocated.
The result of the morphological white top hat.
Return white top hat of an image.
>>> # Subtract grey background from bright peakSee :
... import numpy as np
... from skimage.morphology import square
... bright_on_grey = np.array([[2, 3, 3, 3, 2],
... [3, 4, 5, 4, 3],
... [3, 5, 9, 5, 3],
... [3, 4, 5, 4, 3],
... [2, 3, 3, 3, 2]], dtype=np.uint8)
... white_tophat(bright_on_grey, square(3)) array([[0, 0, 0, 0, 0], [0, 0, 1, 0, 0], [0, 1, 5, 1, 0], [0, 0, 1, 0, 0], [0, 0, 0, 0, 0]], dtype=uint8)
The following pages refer to to this document either explicitly or contain code examples using this.
skimage.morphology.grey.black_tophat
skimage.morphology.grey.white_tophat
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