Wahbeh, Wissam

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Wahbeh
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Wissam
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Wahbeh, Wissam

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2020 - 20212
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Enddatum: 2021 × Anfangsdatum: 2020 × Typ: 01A - Beitrag in wissenschaftlicher Zeitschrift ×

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Gerade angezeigt 1 - 2 von 2
  • Vorschaubild
    Publikation
    Human height estimation from highly distorted surveillance image
    (Wiley, 01.10.2021) Tosti, Francesco; Nardinocchi, Carla; Ciampini, Claudio; Marsella, Maria; Lopes, Pierpaolo; Giuliani, Samuele; Wahbeh, Wissam [in: Journal of Forensic Sciences]
    Video surveillance camera (VSC) is an important source of information during inves- tigations especially if used as a tool for the extraction of verified and reliable foren- sic measurements. In this study, some aspects of human height extraction from VSC video frames are analyzed with the aim of identifying and mitigating error sources that can strongly affect the measurement. More specifically, those introduced by lens distortion are present in wide-field-of-view lens such as VSCs. A weak model, which is not able to properly describe and correct the lens distortion, could introduce sys- tematic errors. This study focuses on the aspect of camera calibration to verify human height extraction by Amped FIVE software, which is adopted by the Forensic science laboratories of Carabinieri Force (RaCIS), Italy. A stable and reliable approach of cam- era calibration is needed since investigators have to deal with different cameras while inspecting the crime scene. The performance of the software in correcting distorted images is compared with a technique of single view self-calibration. Both approaches were applied to several frames acquired by a fish-eye camera and then measuring the height of five different people. Moreover, two actual cases, both characterized by common low-resolution and distorted images, were also analyzed. The height of four known persons was measured and used as reference value for validation. Results show no significant difference between the two calibration approaches working with fish-eye camera in test field, while evidence of differences was found in the measure- ment on the actual cases.
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Vorschaubild
    Publikation
    Digital twinning of the built environment. An interdisciplinary topic for innovation in Didactics
    (Copernicus Publications, 03.08.2020) Wahbeh, Wissam; Kunz, Dominique; Hofmann, Joachim; Bereuter, Pia [in: ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information sciences]
    Abstract. The concept of a Digital Twin (DT) takes an increasingly important role in the construction industry and related research fields. It is a concept associated with Industry 4.0; however, the scientific literature does not provide a unique and clear definition of this concept. This paper aims to analyse the definitions of the digital twin to clarify this concept in the related fields of architecture, engineering and construction (AEC). Moreover, this work proposes and employs the concept of a Digital Twin as an objective for a project-based learning approach in a didactical setting. As an interdisciplinary approach, this work demonstrates the potential impact on the traditional didactical frameworks in the educational domain of construction and its value as an opportunity to introduce interdisciplinary expertise to all students in these fields. This work presents a use case applying the concept at the School of Architecture, Civil Engineering and Geomatics of FHNW.
    01A - Beitrag in wissenschaftlicher Zeitschrift