.. _`Filter Image, Dual Output`:

.. _`syip.imagefiltering2`:

Filter Image, Dual Output
~~~~~~~~~~~~~~~~~~~~~~~~~

.. image:: image_filtering_dual.svg
   :width: 48


Filters one image using algorithms with two images as output

*Algorithms*:


  - *corner_foerstner*

    Computes Foerstner corner measure response images. Outputs error eclipse sizes (top) and roundness or error eclipse (bottom).

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


  - *hessian eigenvalues*

    Computes the eigenvalues of the hessian matrix for each pixel. Returns larger eigenvalue in first output image and smaller in second

    **sigma:**
      Standard deviation of gaussian kernel (default 3.0) used for calculating Hessian.

      Approximation is not reliable for sigma < 3.0



*Input ports*:
    **source** : image

        source image to filter

*Output ports*:
    **resultA** : image

        result after filtering

    **resultB** : image

        result after filtering



*Configuration*:
    **Algorithm** (algorithm)
        (no description)
    **n** (n)
        (no description)
    **sigma** (sigma)
        (no description)
    **threshold** (threshold)
        (no description)

.. automodule:: node_filtering

.. class:: ImageFiltering2