.. _sphx_glr_auto_examples_edges:

Edges and lines
---------------



.. raw:: html

    <div class="sphx-glr-thumbnails">

.. thumbnail-parent-div-open

.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="We use a marching squares method to find constant valued contours in an image. In skimage.measu...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_contours_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_contours.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Contour finding</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="The convex hull of a binary image is the set of pixels included in the smallest convex polygon ...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_convex_hull_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_convex_hull.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Convex Hull</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="The Canny filter is a multi-stage edge detector. It uses a filter based on the derivative of a ...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_canny_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_canny.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Canny edge detector</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="Marching cubes is an algorithm to extract a 2D surface mesh from a 3D volume. This can be conce...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_marching_cubes_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_marching_cubes.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Marching Cubes</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="The active contour model is a method to fit open or closed splines to lines or edges in an imag...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_active_contours_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_active_contours.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Active Contour Model</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="Ridge filters can be used to detect ridge-like structures, such as neurites [1]_, tubes [2]_, v...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_ridge_filter_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_ridge_filter.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Ridge operators</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="This example shows how to draw several different shapes:">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_shapes_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_shapes.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Shapes</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="Example of generating random shapes with particular properties.">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_random_shapes_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_random_shapes.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Random Shapes</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="This example shows how to approximate (Douglas-Peucker algorithm) and subdivide (B-Splines) pol...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_polygon_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_polygon.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Approximate and subdivide polygons</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="The Hough transform in its simplest form is a method to detect straight lines [1]_.">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_line_hough_transform_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_line_hough_transform.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Straight line Hough transform</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="The Hough transform in its simplest form is a method to detect straight lines but it can also b...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_circular_elliptical_hough_transform_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_circular_elliptical_hough_transform.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Circular and Elliptical Hough Transforms</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="Skeletonization reduces binary objects to 1 pixel wide representations. This can be useful for ...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_skeleton_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_skeleton.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Skeletonize</div>
    </div>


.. raw:: html

    <div class="sphx-glr-thumbcontainer" tooltip="Edge operators are used in image processing within edge detection algorithms. They are discrete...">

.. only:: html

  .. image:: /auto_examples/edges/images/thumb/sphx_glr_plot_edge_filter_thumb.png
    :alt:

  :ref:`sphx_glr_auto_examples_edges_plot_edge_filter.py`

.. raw:: html

      <div class="sphx-glr-thumbnail-title">Edge operators</div>
    </div>


.. thumbnail-parent-div-close

.. raw:: html

    </div>


.. toctree::
   :hidden:

   /auto_examples/edges/plot_contours
   /auto_examples/edges/plot_convex_hull
   /auto_examples/edges/plot_canny
   /auto_examples/edges/plot_marching_cubes
   /auto_examples/edges/plot_active_contours
   /auto_examples/edges/plot_ridge_filter
   /auto_examples/edges/plot_shapes
   /auto_examples/edges/plot_random_shapes
   /auto_examples/edges/plot_polygon
   /auto_examples/edges/plot_line_hough_transform
   /auto_examples/edges/plot_circular_elliptical_hough_transform
   /auto_examples/edges/plot_skeleton
   /auto_examples/edges/plot_edge_filter