.. _frangifilter:

frangifilter
************


**Syntax:** :code:`frangifilter(input image, output image, spatial sigma, output scale, c, gamma, alpha, beta)`

Calculates line-enhancing filter Vo according to Frangi - Multiscale vessel enhancement filtering.

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.

spatial sigma [input]
~~~~~~~~~~~~~~~~~~~~~

**Data type:** real

Standard deviation of Gaussian kernel, determines scale of structures that are probed.

output scale [input]
~~~~~~~~~~~~~~~~~~~~

**Data type:** real

**Default value:** 0

Output values are scaled by this number. Pass in zero to scale output value 1 to maximum of the data type for integer data types and to 1 for floating point data types.

c [input]
~~~~~~~~~

**Data type:** real

**Default value:** 0.25

Sensitivity of the filter to deviation from background noise. Typical value is quarter of the value of the maximum intensity of the lines.

gamma [input]
~~~~~~~~~~~~~

**Data type:** real

**Default value:** 0

Scale-space scaling exponent. Set to zero to disable scaling.

alpha [input]
~~~~~~~~~~~~~

**Data type:** real

**Default value:** 0.5

Sensitivity of the filter to deviation from plate-like structures.

beta [input]
~~~~~~~~~~~~

**Data type:** real

**Default value:** 0.5

Sensitivity of the filter to deviation from blob-like structures.

See also
--------

:ref:`satofilter`