Removing small objects in grayscale images with a top hat filterΒΆ

This example shows how to remove small objects from grayscale images. The top-hat transform 1 is an operation that extracts small elements and details from given images. Here we use a white top-hat transform, which is defined as the difference between the input image and its (mathematical morphology) opening.


Original, White tophat, Complementary
import numpy as np
import matplotlib.pyplot as plt

from skimage import data
from skimage import color, morphology

image = color.rgb2gray(data.hubble_deep_field())[:500, :500]

selem =  morphology.disk(1)
res = morphology.white_tophat(image, selem)

fig, ax = plt.subplots(ncols=3, figsize=(20, 8))
ax[0].imshow(image, cmap='gray')
ax[1].set_title('White tophat')
ax[1].imshow(res, cmap='gray')
ax[2].imshow(image - res, cmap='gray')

Total running time of the script: ( 0 minutes 0.557 seconds)

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