.. _`Edge detection`:

.. _`syip.edge_detection`:

Edge detection
``````````````

.. image:: image_edges.svg
   :width: 48


Detects edges in the incoming image




Documentation
:::::::::::::

Algorithms
==========

    **canny**
        Canny edge detection.


        :sigma: Standard deviation of gaussian kernel (default 1.0)


        More info: http://scikit-image.org/docs/0.13.x/api/skimage.feature.html#skimage.feature.canny

    **laplace**
        Find edges using the Laplace operator.


        :kernel size: Kernel size of the discrete Laplacian operator


        More info: http://scikit-image.org/docs/0.13.x/api/skimage.filters.html#skimage.filters.laplace

    **prewitt**
        Find edges using the Prewitt transform as one of, or combination of horizontal and vertical prewitt convolutions


        :horizontal/vertical: Select orientation for transform, if both then mean square of both will be used


        More info: http://scikit-image.org/docs/0.13.x/api/skimage.filters.html#skimage.filters.prewitt_h

    **roberts**
        Find edges using Robert's cross operator.


        :positive/negative diagonal: Select orientation for transform


        More info: http://scikit-image.org/docs/0.13.x/api/skimage.filters.html#skimage.filters.roberts_pos_diag

    **scharr**
        Find edges using the Scharr transform as one of, or combination of horizontal and vertical prewitt convolutions.
        The Scharr operator has a better rotation invariance than other edge filters such as the Sobel or the Prewitt operators


        :horizontal/vertical: Select orientation for transform, if both then mean square of both will be used


        More info: http://scikit-image.org/docs/0.13.x/api/skimage.filters.html#skimage.filters.scharr_h

    **sobel**
        Find edges using the Sobel transform as one of, or combination of horizontal and vertical prewitt convolutions.


        :horizontal/vertical: Select orientation for transform, if both then mean square of both will be used


        More info: http://scikit-image.org/docs/0.13.x/api/skimage.filters.html#skimage.filters.sobel_h


Definition
::::::::::


Input ports
===========

    **source**  image
        source image to filter


Output ports
============

    **result**  image
        result after filtering




Configuration
=============

    **Algorithm** (algorithm)
        (no description)
    **horizontal/vertical** (horizontal/vertical)
        (no description)
    **kernel size** (kernel size)
        (no description)
    **positive/negative diagonal** (positive/negative diagonal)
        (no description)
    **sigma** (sigma)
        (no description)









Implementation
==============

.. automodule:: node_detection_filters
    :noindex:

.. class:: EdgeDetection
    :noindex: