Počet záznamů: 1
Suppression of residual gradients in the flat-field corrected images
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SYSNO ASEP 0507997 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Suppression of residual gradients in the flat-field corrected images Tvůrce(i) Vopálenský, Michal (UTAM-F) RID, ORCID, SAI
Kumpová, Ivana (UTAM-F) RID, SAI, ORCID
Vavřík, Daniel (UTAM-F) RID, SAI, ORCIDCelkový počet autorů 3 Číslo článku 23716 Zdroj.dok. 9th Conference on Industrial Computed Tomography (iCT) 2019. - Bad Breisig : NDT.net, 2019 - ISSN 1435-4934 Poč.str. 5 s. Forma vydání Online - E Akce Conference on Industrial Computed Tomography (iCT) 2019 /9./ Datum konání 13.02.2019 - 15.02.2019 Místo konání Padova Země IT - Itálie Typ akce WRD Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova image processing ; flat field correction ; radiography ; computed tomography ; image correction methods Vědní obor RIV JB - Senzory, čidla, měření a regulace Obor OECD Computer sciences, information science, bioinformathics (hardware development to be 2.2, social aspect to be 5.8) Institucionální podpora UTAM-F - RVO:68378297 Anotace 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. Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2020 Elektronická adresa http://www.ndt.net/?id=23716
Počet záznamů: 1