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NCJ Number: 135798 Add to Shopping cart Find in a Library
Title: Incipient Ridges and the Clarity Spectrum
Journal: Journal of Forensic Identification  Volume:42  Issue:2  Dated:(March/April 1992)  Pages:106-114
Author(s): D R Ashbaugh
Date Published: 1992
Page Count: 9
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: Incipient ridges may create certain inconsistencies as to their inclusion and value as part of the fingerprint identification process, but they can be a vital factor in determining individuality when approached from their morphological structure and evaluated as to their significance in the clarity spectrum.
Abstract: During the identification process, the value of incipient ridges depends on the clarity of friction ridge structures. Clarity also dictates whether incipient ridges may qualify as nonspecific or accidental characteristics. Incipient ridges are thin, fragmented ridges which appear in the furrows between normal, mature friction ridges. They are narrower in width, do not usually have the same height as normal ridges, and are reported to lack pore structure. Incipient ridges are often called false ridges when fingerprints are classified for ten print searching and filing purposes. Nonetheless, incipient ridges form in the same manner as normal ridges and have the same subcutaneous structures. Ridge units begin developing at different times and at various locations on friction skin. As incipient ridges are formed by ridge unit development, some incipient ridges will mature more than others. The location of ridge structure on the clarity spectrum dictates the level of detail that can be compared. Whether incipient ridges qualify as nonspecific or accidental characteristics depends on the clarity of ridge structures and on the examiner's ability to judge where ridge structures fit in the clarity spectrum. 7 references and 8 figures
Main Term(s): Fingerprint classification; Fingerprint image quality
Index Term(s): Criminal investigation; Forensic sciences
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