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Human height estimation from highly distorted surveillance image
Author(s) -
Tosti Francesco,
Nardinocchi Carla,
Wahbeh Wissam,
Ciampini Claudio,
Marsella Maria,
Lopes Pierpaolo,
Giuliani Samuele
Publication year - 2022
Publication title -
journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.715
H-Index - 96
eISSN - 1556-4029
pISSN - 0022-1198
DOI - 10.1111/1556-4029.14888
Subject(s) - distortion (music) , computer science , computer vision , artificial intelligence , calibration , lens (geology) , camera resectioning , software , camera lens , field of view , field (mathematics) , optics , mathematics , statistics , physics , computer network , amplifier , bandwidth (computing) , pure mathematics , programming language
Video surveillance camera (VSC) is an important source of information during investigations especially if used as a tool for the extraction of verified and reliable forensic 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 systematic 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 camera 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 measurement on the actual cases.