TY - CONF A1 - Osterloh, Kurt T1 - Ways of Digital Image Processing to Obtain Fast and Unbiased Results T2 - 18th World Conference on NDT (WCNDT 2012) CY - Durban, South Africa DA - 2012-04-16 PY - 2012 AN - OPUS4-26655 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Osterloh, Kurt T1 - Der EFNDT WG5 Workshop in Berlin Köpenick vom 22. bis 24. Oktober 2012 PY - 2012 UR - http://www.dgzfp.de/Portals/24/Zeitung/Ausgaben/Zeitung132.pdf#page=10 SN - 1616-069X SN - 0948-5112 VL - 132 SP - 12 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung CY - Berlin AN - OPUS4-27549 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - Safety and Security, Dealing with Risks T2 - 7th FutureSecurity CY - Bonn, Germany DA - 2012-09-04 PY - 2012 AN - OPUS4-27496 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - Das Verständnis von Risiko und dessen Einschätzung T2 - DACH-Jahrestagung DGZfP CY - Graz, Austria DA - 2012-09-17 PY - 2012 AN - OPUS4-27497 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - Bildbearbeitung; automatische Eigenschaftserkennung versus visuelle Bearbeitung T2 - DACH-Jahrestagung DGZfP CY - Graz, Austria DA - 2012-09-17 PY - 2012 AN - OPUS4-27498 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - Approaching an understanding of risk: a subject for the EFNDT Working Group 5 "NDT Technology for Public Security and Safety" T2 - 3rd EFNDT WG5 Workshop "NDT Technology for Public Security and Safety" CY - Berlin, Germany DA - 2012-10-22 PY - 2012 AN - OPUS4-27499 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - Risk assessment techniques samples T2 - 3rd EFNDT WG5 Workshop "NDT Technology for Public Security and Safety" CY - Berlin, Germany DA - 2012-10-22 PY - 2012 AN - OPUS4-27500 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - EFNDT Working Group 5, from mines to any kind of threats T2 - 3rd EFNDT WG5 Workshop "NDT Technology for Public Security and Safety" CY - Berlin, Germany DA - 2012-10-22 PY - 2012 AN - OPUS4-27501 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt T1 - Security research and expertise at the BAM Federal Institute for Materials Research and Testing T2 - Archimedes first End-User and Operator Driven Roundtable: Towards More Efficient Civil Aviation Security? CY - Berlin-Schönhagen, Germany DA - 2012-12-03 PY - 2012 AN - OPUS4-27502 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Osterloh, Kurt A1 - Bücherl, T. A1 - Zscherpel, Uwe A1 - Ewert, Uwe T1 - Image recovery by removing stochastic artefacts identified as local asymmetries N2 - Stochastic artefacts are frequently encountered in digital radiography and tomography with neutrons. Most obviously, they are caused by ubiquitous scattered radiation hitting the CCD-sensor. They appear as scattered dots and, at higher frequency of occurrence, they may obscure the image. Some of these dotted interferences vary with time, however, a large portion of them remains persistent so the problem cannot be resolved by collecting stacks of images and to merge them to a median image. The situation becomes even worse in computed tomography (CT) where each artefact causes a circular pattern in the reconstructed plane. Therefore, these stochastic artefacts have to be removed completely and automatically while leaving the original image content untouched. A simplified image acquisition and artefact removal tool was developed at BAM and is available to interested users. Furthermore, an algorithm complying with all the requirements mentioned above was developed that reliably removes artefacts that could even exceed the size of a single pixel without affecting other parts of the image. It consists of an iterative two-step algorithm adjusting pixel values within a 3 × 3 matrix inside of a 5 × 5 kernel and the centre pixel only within a 3 × 3 kernel, resp. It has been applied to thousands of images obtained from the NECTAR facility at the FRM II in Garching, Germany, without any need of a visual control. In essence, the procedure consists of identifying and tackling asymmetric intensity distributions locally with recording each treatment of a pixel. Searching for the local asymmetry with subsequent correction rather than replacing individually identified pixels constitutes the basic idea of the algorithm. The efficiency of the proposed algorithm is demonstrated with a severely spoiled example of neutron radiography and tomography as compared with median filtering, the most convenient alternative approach by visual check, histogram and power spectra analysis. KW - Data processing methods KW - Image filtering KW - Pattern recognition KW - Cluster finding KW - Calibration and fitting methods PY - 2012 DO - https://doi.org/10.1088/1748-0221/7/04/C04018 SN - 1748-0221 VL - 7 IS - April SP - 1 EP - 14 PB - Inst. of Physics Publ. CY - London AN - OPUS4-25877 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -