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Automated Texture Recognition of Quartz Sand Grains for Forensic Applications* |
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| Authors: | Newell Andrew J Morgan Ruth M Griffin Lewis D Bull Peter A Marshall John R Graham Giles |
| Affiliation: | Department of Computer Science, University College London, London, U.K. Centre for Mathematics and Physics in the Life Sciences and Experimental Biology (CoMPLEX), University College London, London, U.K. Department of Security and Crime Science, University College London, London, U.K. Oxford University Centre for the Environment, University of Oxford, Oxford, U.K. SETI Institute, Mountain View, CA. AWE, Aldermarston, Reading, U.K. Institute for Security Science and Technology, Imperial College London, London, U.K. |
| Abstract: | Quartz sand surface texture analysis has been automated for the first time for forensic application. The derived Basic Image Features (BIFs) provide computer-generated texture recognition from preexisting data sets. The technique was applied to two distinct classification problems; first, the ability of the system to discriminate between (quartz) sand grains with upturned plate features (indicative of eolian, global sand sea environments) and grains that do not exhibit these features. A success rate of grain classification of 98.8% was achieved. Second, to test the ability of the computer recognition system to identify specific energy levels of formation of the upturned plate surface texture features. Such recognition ability has to date been beyond manual geological interpretation. The discrimination performance was enhanced to an exact classification success rate of 81%. The enhanced potential for routine forensic investigation of the provenance of common quartz sand is indicated. |
| Keywords: | forensic science quartz grain surface texture analysis provenance Basic Image Features encoding automated recognition |
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