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                            Library & Multimedia
 Validation of Tool Mark Comparisons Obtained Using a Quantitative, Comparative, Statistical Algorithm
NCJ Number
              231636
Journal

*Journal of Forensic Sciences* Volume: 55 Issue: 4 Dated: July 2010 Pages: 953-961
Author(s)
          L. Scott Chumbley, Ph.D.;
                        Max D. Morris, Ph.D.;
                        M. James Kreiser, B.S.;
                        Charles Fisher, B.S.;
                        Jeremy Craft, M.S.;
                        Lawrence J. Genalo, Ph.D.;
                        Stephen Davis, B.S.;
                        David Faden, B.S.;
                        Julie Kidd, M.S.
Date Published

July 2010
Length
              9 pages
Annotation
              A statistical analysis and computational algorithm for comparing pairs of tool marks via profilometry data is described.
Abstract
              Empirical validation of the method is established through experiments based on tool marks made at selected fixed angles from 50 sequentially manufactured screwdriver tips. Results obtained from three different comparison scenarios are presented and are in agreement with experiential knowledge possessed by practicing examiners. Further comparisons between scores produced by the algorithm and visual assessments of the same tool mark pairs by professional tool mark examiners in a blind study in general show good agreement between the algorithm and human experts. In specific instances where the algorithm had difficulty in assessing a particular comparison pair, results obtained during the collaborative study with professional examiners suggest ways in which algorithm performance may be improved. It is concluded that the addition of contextual information when inputting data into the algorithm should result in better performance. (Published Abstract)
      
  
          Additional Details
Grant Number(s)
        2004-IJ-R-088


  
  
        
  Agencies
        NIJ-Sponsored


  
  
        
  Publication Type
        Report (Study/Research)


  
  
        
  Award
        Quantification of Tool Markings
    
  
  
Date Published: July 1, 2010
    
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