Suppression of residual gradients in the flat-field corrected images

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F19%3A00507997" target="_blank" >RIV/68378297:_____/19:00507997 - isvavai.cz</a>

Result on the web

<a href="http://www.ndt.net/?id=23716" target="_blank" >http://www.ndt.net/?id=23716</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Suppression of residual gradients in the flat-field corrected images

Original language description

Flat field correction, based on using the open beam and the dark field images, is a basic method used for correction of the projection images acquired in computed tomography process. The correction suppresses the stationary noise of the detector, caused by non-uniform gain and offset of each pixel, as well as the non-uniformity of intensity caused by the non-flat intensity profile of the incident X-rays beam. In an ideal case, the corrected image should have a constant intensity in the open-beam areas, i.e., everywhere outside the investigated object. However, this is not always true due to several factors, such as drifts of the spot position, wearing out of the target (pitting), etc. In such a case, the background in the flat-field corrected image is not really “flat” or constant. Particularly in radiography, this is an undesired effect, because the intensity values are also influenced in the object area, leading thus to a possible misinterpretation of the image (even for a constant thickness area, the intensity distribution looks like if the thickness was varying). In this paper, a method is described how to compensate this effect in rather an effective way.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10201 - Computer sciences, information science, bioinformathics (hardware development to be 2.2, social aspect to be 5.8)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

9th Conference on Industrial Computed Tomography (iCT) 2019

ISBN

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ISSN

1435-4934

e-ISSN

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Number of pages

5

Pages from-to

23716

Publisher name

NDT.net

Place of publication

Bad Breisig

Event location

Padova

Event date

Feb 13, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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