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Table of Contents

Summary


CcpiRingArtefactFilterVoCentering
Process categoryBrief description

Computational demand

(low, medium, high)

Comment(s)Reference(s)Common alternative process(es)
correctorfilter

To suppress ring artefacts.

An analytical formula for ring artefact suppression in X-ray tomography and references therein.

find an optimal value of CoR automatically.



Reliable method for calculating the center of rotation in parallel-beam tomography VoCenteringIterative


Parameters


Code Block
titleSavu Configurator command
>>> disp -avv

-------------------------------------------------------------------------------------
 1) CcpiRingArtefactFilterVoCentering(savu.plugins.ring_removalcentering.ccpi_ring_artefact_filter)vo_centering)                                 
  A plugin to perform ring artefact removal find the center of rotation per frame                                  
    1)                preview : []
 1)   A slice list of required frames (sinograms) to use in num_seriesthe :calulation 1of the
   High aspectcentre rationof compensationrotation (this will not reduce the data size for plate-like objects only) subsequent plugins).
    2)            start_pixel : None
    The approximate centre. If value is None, take the param_rvalue :from 0.005nxs file else set
 The correction strength -to decreaseimage (typicallycentre.
in order of magnitude steps3)  to          increasesearch_area ring: supression, or increase to reduce ring supression(-50, 50)
    Search area from horizontal approximate centre of the image.
    34)            in_datasets : []
    Create a list of the dataset(s) to process.
    5)    4      search_radius : 6
    Use for fine searching.
    6)                  ratio : 0.5
    The ratio between the size of object and FOV of the camera.
    7)           out_datasets : ['cor_raw', 'cor_fit']
    Create aThe default names.
    8)   datasets_to_populate : []
    A list of the dataset(s) to createdatasets which require this information.
    59)                paramrow_ndrop : 20
0    Drop lines around vertical Unknown description (for plate-like objects only)center of the mask.
   10)                   step : 0.5
    Step of fine searching.
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>>> 
ItemParameter nameParameter formatExample(s)Comment(s)
Parameter valueEffect
1
num_series

preview





2
param

start_

r

pixel





3

search_area





4

in_datasets

4




5search_radius



6ratio



7out_datasets
5param_n




8

datasets_to_populate





9row_drop



10step





Usage

Cont.