createfbpfilter.txt

.. _createfbpfilter:

createfbpfilter
***************


**Syntax:** :code:`createfbpfilter(image, size, filter type, cut-off)`

Creates image containing values of filter function used in filtered backprojection. Can be used to visualize different filter functions.

This command cannot be used in the distributed processing mode. If you need it, please contact the authors.

Arguments
---------

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

**Data type:** float32 image

Image where the filter is to be placed.

size [input]
~~~~~~~~~~~~

**Data type:** positive integer

**Default value:** 100

Size of the filter. This corresponds to the padded image size in FBP.

filter type [input]
~~~~~~~~~~~~~~~~~~~

**Data type:** string

**Default value:** Ramp

Type of the filter. Supported values are Ideal ramp, Ramp, Shepp-Logan, Cosine, Hamming, Hann, Blackman, Parze.

cut-off [input]
~~~~~~~~~~~~~~~

**Data type:** real

**Default value:** 1

Filter cut-off frequency, 0 corresponds to DC and 1 corresponds to Nyquist.

See also
--------

:ref:`fbppreprocess`, :ref:`fbp`, :ref:`deadpixelremoval`, :ref:`createfbpfilter`, :ref:`defaultrecsettings`