.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "advanced/image_processing/auto_examples/plot_greyscale_dilation.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_advanced_image_processing_auto_examples_plot_greyscale_dilation.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_advanced_image_processing_auto_examples_plot_greyscale_dilation.py:


Greyscale dilation
====================

This example illustrates greyscale mathematical morphology.

.. GENERATED FROM PYTHON SOURCE LINES 7-41



.. image-sg:: /advanced/image_processing/auto_examples/images/sphx_glr_plot_greyscale_dilation_001.png
   :alt: plot greyscale dilation
   :srcset: /advanced/image_processing/auto_examples/images/sphx_glr_plot_greyscale_dilation_001.png
   :class: sphx-glr-single-img





.. code-block:: default


    import numpy as np
    import scipy as sp
    import matplotlib.pyplot as plt

    im = np.zeros((64, 64))
    np.random.seed(2)
    x, y = (63*np.random.random((2, 8))).astype(int)
    im[x, y] = np.arange(8)

    bigger_points = sp.ndimage.grey_dilation(im, size=(5, 5), structure=np.ones((5, 5)))

    square = np.zeros((16, 16))
    square[4:-4, 4:-4] = 1
    dist = sp.ndimage.distance_transform_bf(square)
    dilate_dist = sp.ndimage.grey_dilation(dist, size=(3, 3), \
            structure=np.ones((3, 3)))

    plt.figure(figsize=(12.5, 3))
    plt.subplot(141)
    plt.imshow(im, interpolation='nearest', cmap=plt.cm.nipy_spectral)
    plt.axis('off')
    plt.subplot(142)
    plt.imshow(bigger_points, interpolation='nearest', cmap=plt.cm.nipy_spectral)
    plt.axis('off')
    plt.subplot(143)
    plt.imshow(dist, interpolation='nearest', cmap=plt.cm.nipy_spectral)
    plt.axis('off')
    plt.subplot(144)
    plt.imshow(dilate_dist, interpolation='nearest', cmap=plt.cm.nipy_spectral)
    plt.axis('off')

    plt.subplots_adjust(wspace=0, hspace=0.02, top=0.99, bottom=0.01, left=0.01, right=0.99)
    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  0.064 seconds)


.. _sphx_glr_download_advanced_image_processing_auto_examples_plot_greyscale_dilation.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example




    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_greyscale_dilation.py <plot_greyscale_dilation.py>`

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_greyscale_dilation.ipynb <plot_greyscale_dilation.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_