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NCJRS Abstract

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NCJ Number: 136868 Find in a Library
Title: Application of Digital Image Enhancement Software with the Macintosh Computer to Questioned Document Problems
Journal: Journal of Forensic Sciences  Volume:37  Issue:3  Dated:(May 1992)  Pages:783-796
Author(s): J A Black
Date Published: 1992
Page Count: 14
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: Computerized image enhancement has been shown to be a useful tool in examining questioned documents, and the current study used the Digital Darkroom computer program with a Macintosh Plus computer, a black and white laser printer, and both hand-held and full-size scanners to enhance nearly obliterated writing.
Abstract: Use of the Digital Darkroom software with an optical scanner or video camera and laser printer opens the door to the possibility of creating digitized images of documentary evidence and then altering or enhancing the image. The scanner or video camera converts the document into digital code suitable for manipulation, storage, and printing. Once a document has been scanned, the software can be used to digitally change its appearance. Pencil writing which had been erased and then overwritten and writing obscured by typewriter correction fluid are illustrated before and after computerized image enhancement. A photograph of a check printed from microfilm was enhanced by the author, and his results are compared with the efforts of a professional computer image service. 2 references and 10 figures (Author abstract modified)
Main Term(s): Document analysis
Index Term(s): Computer aided investigations; Criminal investigation; Typewriting analysis
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