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

.. only:: html

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

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

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

.. _sphx_glr_intro_scipy_auto_examples_plot_connect_measurements.py:


=============================
Demo connected components
=============================

Extracting and labeling connected components in a 2D array

.. GENERATED FROM PYTHON SOURCE LINES 8-12

.. code-block:: Python


    import numpy as np
    import matplotlib.pyplot as plt








.. GENERATED FROM PYTHON SOURCE LINES 13-14

Generate some binary data

.. GENERATED FROM PYTHON SOURCE LINES 14-35

.. code-block:: Python

    x, y = np.indices((100, 100))
    sig = (
        np.sin(2 * np.pi * x / 50.0)
        * np.sin(2 * np.pi * y / 50.0)
        * (1 + x * y / 50.0**2) ** 2
    )
    mask = sig > 1

    plt.figure(figsize=(7, 3.5))
    plt.subplot(1, 2, 1)
    plt.imshow(sig)
    plt.axis("off")
    plt.title("sig")

    plt.subplot(1, 2, 2)
    plt.imshow(mask, cmap="gray")
    plt.axis("off")
    plt.title("mask")
    plt.subplots_adjust(wspace=0.05, left=0.01, bottom=0.01, right=0.99, top=0.9)





.. image-sg:: /intro/scipy/auto_examples/images/sphx_glr_plot_connect_measurements_001.png
   :alt: sig, mask
   :srcset: /intro/scipy/auto_examples/images/sphx_glr_plot_connect_measurements_001.png
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 36-37

Label connected components

.. GENERATED FROM PYTHON SOURCE LINES 37-49

.. code-block:: Python

    import scipy as sp

    labels, nb = sp.ndimage.label(mask)

    plt.figure(figsize=(3.5, 3.5))
    plt.imshow(labels)
    plt.title("label")
    plt.axis("off")

    plt.subplots_adjust(wspace=0.05, left=0.01, bottom=0.01, right=0.99, top=0.9)





.. image-sg:: /intro/scipy/auto_examples/images/sphx_glr_plot_connect_measurements_002.png
   :alt: label
   :srcset: /intro/scipy/auto_examples/images/sphx_glr_plot_connect_measurements_002.png
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 50-51

Extract the 4th connected component, and crop the array around it

.. GENERATED FROM PYTHON SOURCE LINES 51-60

.. code-block:: Python

    sl = sp.ndimage.find_objects(labels == 4)
    plt.figure(figsize=(3.5, 3.5))
    plt.imshow(sig[sl[0]])
    plt.title("Cropped connected component")
    plt.axis("off")

    plt.subplots_adjust(wspace=0.05, left=0.01, bottom=0.01, right=0.99, top=0.9)

    plt.show()



.. image-sg:: /intro/scipy/auto_examples/images/sphx_glr_plot_connect_measurements_003.png
   :alt: Cropped connected component
   :srcset: /intro/scipy/auto_examples/images/sphx_glr_plot_connect_measurements_003.png
   :class: sphx-glr-single-img






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

   **Total running time of the script:** (0 minutes 0.078 seconds)


.. _sphx_glr_download_intro_scipy_auto_examples_plot_connect_measurements.py:

.. only:: html

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

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

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

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

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: plot_connect_measurements.zip <plot_connect_measurements.zip>`


.. only:: html

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

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