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NCJRS Abstract

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NCJ Number: 136869 Find in a Library
Title: Additional Applications of Digital Image Processing to Forensic Document Examinations
Journal: Journal of Forensic Sciences  Volume:37  Issue:3  Dated:(May 1992)  Pages:797-807
Author(s): A P Behnen; L K Nelson
Date Published: 1992
Page Count: 11
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: Two experimental applications of digital image processing to the examination of questioned documents are evaluated.
Abstract: The first application involves a comparison of digital image processing, electrostatic detection apparatus (ESDA) processing, side lighting, and photography in the decipherment of indented writing. The best results are demonstrated by first using the ESDA and then digitally enhancing the ESDA lift with a high-pass sharpening filter. The second application is the use of image processing equipment to make fracture match comparisons to associate carbon film typewriter ribbons with questioned typescript. Split screen images and image overlays are shown to be very effective techniques for this kind of examination. A benefit of the fracture match identification system is that large numbers of documents and letters can be examined simply by removing one and placing another under the camera. In addition, the system is less stressful on the eyes than the comparison microscope. If a printer is part of the image enhancement hardware, a printed picture can be made of the match for case file notes and courtroom demonstration. The image can also be saved on a disk for future use. 2 references and 8 figures (Author abstract modified)
Main Term(s): Document analysis; Photographic identification
Index Term(s): Computer aided investigations; Photographic analyses; Photography techniques; Typewriting analysis
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