NCJ Number
238371
Journal
Journal of Forensic Identification Volume: 62 Issue: 2 Dated: March/April 2012 Pages: 165-182
Date Published
April 2012
Length
18 pages
Annotation
In this paper, three questions involving video frame comparisons are addressed.
Abstract
The scientific authentication of digital video-audio recordings involves the examination of both the visual and acoustic information through a number of analysis steps. One step in this protocol is determining whether any of the individual images are identical to any other images within the same digital recording. Additionally, in some examinations, it is necessary to identify nonmatching pixels from nearly identical images. These duplicate, or nearly duplicate images, could be indicative of editing, an irregularity of a specific recording device, or just identically captured and processed images. In this paper, three questions involving video frame comparisons are addressed: 1) Does a specific, commonly available, consumer-quality camcorder produce any identical images with a static visual view in standard and high definition modes? (2) Are there accurate methodologies for determining whether two recorded digital images are identical? (3) What digital analysis procedures are available for comparing two nearly identical images? These questions are answered with the analysis of more than 147,100 frames from a consumer camcorder using digital data analyses and Photoshop routines. (Published Abstract)