title: Relative effects of posture and activity on human height estimation from surveillance footage.
abstract: Height estimations based on security camera footage are often requested by law enforcement authorities. While valid and reliable techniques have been established to determine vertical distances from video frames, there is a discrepancy between a person's true static height and their height as measured when assuming different postures or when in motion (e.g., walking). The aim of the research presented in this report was to accurately record the height of subjects as they performed a variety of activities typically observed in security camera footage and compare results to height recorded using a standard height measuring device. Forty-six able bodied adults participated in this study and were recorded using a 3D motion analysis system while performing eight different tasks. Height measurements captured using the 3D motion analysis system were compared to static height measurements in order to determine relative differences. It is anticipated that results presented in this report can be used by forensic image analysis experts as a basis for correcting height estimations of people captured on surveillance footage.
authors.affiliation: Department of Rehabilitation, School of Health Sciences, Jönköping University, Box 1026, SE-551 11 Jönköping, Sweden. Nerrolyn.ramstrand@hhj.hj.se
authors.forename: Nerrolyn
authors.initials: N
authors.lastname: Ramstrand
authors.forename: Simon
authors.initials: S
authors.lastname: Ramstrand
authors.forename: Per
authors.initials: P
authors.lastname: Brolund
authors.forename: Kristin
authors.initials: K
authors.lastname: Norell
authors.forename: Peter
authors.initials: P
authors.lastname: Bergström
mesh_terms: D000328:Adult; D001827:Body Height; D005260:Female; D005554:Forensic Medicine / Q000379:methods; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D009038:Motion; D010865:Pilot Projects; D011187:Posture / Q000502:physiology*; D012494:Sampling Studies; D012637:Security Measures; D014741:Video Recording; D016138:Walking