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NCJRS Abstract

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NCJ Number: 229279 Add to Shopping cart Find in a Library
Title: Body Height Measurement in Images
Journal: Journal of Forensic Sciences  Volume:54  Issue:6  Dated:November 2009  Pages:1365-1375
Author(s): Bart Hoogeboom, M.Sc.; Ivo Alberink, Ph.D.; Mirelle Goos, M.Sc.
Date Published: November 2009
Page Count: 11
Type: Instructional Material; Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: In order to test whether the difference in the measurement of a person’s height in an image and that person’s actual height is due to the camera and other circumstances, an experiment was conducted that involved the measurement of 22 test persons using 3 cameras of varying quality.
Abstract: The main conclusion of the study is that when height measurements are performed on images of persons, an error is made that depends on the stance of the person and on the camera position. A statistical analysis of measurement on different persons must be performed for each new case and helps to gain more insight regarding this error. Reproducibility of measurement per image was apparently strongly dependent on the camera quality; whereas, systematic bias differed with the view point of the camera. The measurement process was also dependent on the camera operator, so its repetition by different operators is recommended. Apart from the camera quality, the position of the person in the image, and the operator, other factors are the height of the person in the image in pixels (“resolution” of the person), camera location and orientation (tilt), and lens distortion. As for height measurements in real life, they are always estimates of actual values. Descriptions of methods and techniques address the set-up of the main experiment, notation, kernel density estimation, and numerical analysis. 9 tables, 12 figures, and 9 references
Main Term(s): Criminology
Index Term(s): Foreign criminal justice research; Forensic sciences; Investigative techniques; Netherlands; Photographic analyses; Photographic identification; Photography; Police photography training; Suspect identification; Testing and measurement; Visual electronic surveillance
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