A Rigorous Technique for Forensic Measurement of Surveillance Video Footage
A Rigorous Technique for Forensic
|ERA Journal ID||4653|
|Authors||Chong, A. K.|
|Journal Title||Photogrammetric Engineering and Remote Sensing|
|Journal Citation||68 (7), pp. 753-759|
|Number of Pages||7|
|Place of Publication||United States|
A technique using a mono-view video frame to make accurate measurement of physical features of a crime suspect is discussed. The technique uses a portable control frame to calibrate the surveillance video cameras lens in situ. The control frame is also used to provide object-space control for the computation of exterior orientation parameters of the photography. The technique removes lens distortion, x-tilt, y-tilt, and PPA offset from the video frame coordinates. Surveillance video camera lens calibration and the laboratory testing of the technique are discussed in detail. In addition, an argument is provided to examine the uncertainties in the forensic measurement using mono-view video footage. A case study involving a short clip of bank surveillance video footage is used to demonstrate the use of this technique in a photogrammetrically unfriendly situation. Trials show that height measurement accuracy using this technique exceeds the police specification of 30 mm for a suspect standing upright.
|Keywords||Calibration; Law enforcement; Lenses; Video cameras|
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|Byline Affiliations||University of Otago, New Zealand|
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