Quantifying and Ranking Quality for Acquired Recordings on Digital Video Recorders

Journal of Forensic Sciences
Walter E Bruehs, Dorothy Stout

Abstract

As the closed-circuit television (CCTV) security industry transitioned from analog media to digital video recorders (DVRs) with digital storage, the law enforcement community struggled with the means with which to collect the recordings. New guidelines needed to be established to determine the collection method which would be efficient as well as provide the best quality evidence from live DVRs. A test design was developed to measure, quantify, and rank the quality of acquisition methods used on live systems from DVRs typically used in digital CCTV systems. The purpose was to determine guidelines for acquiring the best quality video for investigative purposes. A test pattern which provided multiple quantifiable metrics for comparison between the methods of acquisition was used. The methods of acquisition included direct data download of the proprietary file and open file format as well as recording the video playback from the DVR via the available display monitor connections including the composite video, Video Graphics Array (VGA), and high-definition multimedia interface (HDMI). While some acquisition methods may provide the best quality evidence, other methods of acquisition are not to be discounted depending on the situatio...Continue Reading

Citations

May 21, 2021·Forensic Science, Medicine, and Pathology·Elena GiovanniniPaolo Fais
Oct 9, 2021·Journal of Forensic Sciences·Walter E Bruehs, Dorothy Stout

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