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Comparison of the Performance of Two Methods for Height Estimation

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In the case study, two methods of performing body height measurements in images are compared based on projective geometry and 3D modeling of the crime scene. Accuracy and stability of height estimations are tested using reconstruction images of test persons of known height. Given unchanged camera settings, predictions of both methods are accurate. However, as the camera had been moved in the case, new vanishing points and camera matches had to be created for the reconstruction images. 3D modeling still yielded accurate and stable estimations. Projective geometry produced incorrect predictions for test persons and unstable intervals for questioned persons. The latter is probably caused by the straight lines in the field of view being hard to discern. With the quality of material presented, which is representative for our case practice, using vanishing points may thus yield unstable results. The results underline the importance of performing validation experiments in casework.
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Keywords: CCTV images; body height measurement; digital images; forensic science; photogrammetry; stability; validation; video images

Document Type: Research Article

Affiliations: Netherlands Forensic Institute, PO Box 24044, 2490 AA Den Haag, The Netherlands.

Publication date: March 1, 2010

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