.. _danielsson2:

danielsson2
***********


**Syntax:** :code:`danielsson2(input image, output image)`

Calculates an estimate of the set of centers of locally maximal spheres from squared Euclidean distance map. Uses Danielsson's algorithm. The output image can be interpreted as a medial axis or a distance ridge. Drawing a sphere on each nonzero pixel in the output image, with radius and color equal to square root of pixel value, results in a local thickness map of the structure. See e.g. Yaorong Ge and J. Michael Fitzpatrick - On the Generation of Skeletons from Discrete Euclidean Distance Maps, IEEE Transactions on Pattern Analysis and Machine Intelligence 18, 1996; and P.-E. Danielsson, Euclidean distance mapping, Computer Graphics and Image Processing 14(3), 1980.

This command can be used in the distributed processing mode. Use :ref:`distribute` command to change processing mode from local to distributed.

Arguments
---------

input image [input]
~~~~~~~~~~~~~~~~~~~

**Data type:** uint8 image, uint16 image, uint32 image, uint64 image, int8 image, int16 image, int32 image, int64 image, float32 image

Input image.

output image [output]
~~~~~~~~~~~~~~~~~~~~~

**Data type:** uint8 image, uint16 image, uint32 image, uint64 image, int8 image, int16 image, int32 image, int64 image, float32 image

Output image.

See also
--------

:ref:`dmap2`, :ref:`dmap`, :ref:`tmap`