Quantitative matching of forensic evidence fragments utilizing 3D microscopy analysis of fracture surface replicas DOI Creative Commons
Bishoy Dawood, Carlos Llosa-Vite, Geoffrey Z. Thompson

et al.

Journal of Forensic Sciences, Journal Year: 2022, Volume and Issue: 67(3), P. 899 - 910

Published: March 7, 2022

Abstract Silicone casts are widely used by practitioners in the comparative analysis of forensic items. Fractured surfaces carry unique details that can provide accurate quantitative comparisons fragments. In this study, a statistical comparison protocol was applied to set 3D topological images fractured surface pairs and their replicas confidence between items silicone cast replicas. A 10 stainless steel samples were from same metal rod under controlled conditions replicated using standard casting technique. Six maps with 50% overlap acquired for each pair. Spectral analyses utilized identify correlation features at different length scales topology. We selected two frequency bands over critical wavelength (greater than two‐grain diameters) comparison. Our model matrix‐variate t ‐distribution accounts match non‐match population densities. decision rule identified probability matched unmatched surfaces. The proposed methodology correctly classified posterior exceeding 99.96%. Moreover, replication technique shows potential accurately replicating fracture greater 20 μm, which far exceeds feature range on most metallic alloy framework establishes basis limits articles while providing reliable mechanics‐based

Language: Английский

Quantitative matching of forensic evidence fragments utilizing 3D microscopy analysis of fracture surface replicas DOI Creative Commons
Bishoy Dawood, Carlos Llosa-Vite, Geoffrey Z. Thompson

et al.

Journal of Forensic Sciences, Journal Year: 2022, Volume and Issue: 67(3), P. 899 - 910

Published: March 7, 2022

Abstract Silicone casts are widely used by practitioners in the comparative analysis of forensic items. Fractured surfaces carry unique details that can provide accurate quantitative comparisons fragments. In this study, a statistical comparison protocol was applied to set 3D topological images fractured surface pairs and their replicas confidence between items silicone cast replicas. A 10 stainless steel samples were from same metal rod under controlled conditions replicated using standard casting technique. Six maps with 50% overlap acquired for each pair. Spectral analyses utilized identify correlation features at different length scales topology. We selected two frequency bands over critical wavelength (greater than two‐grain diameters) comparison. Our model matrix‐variate t ‐distribution accounts match non‐match population densities. decision rule identified probability matched unmatched surfaces. The proposed methodology correctly classified posterior exceeding 99.96%. Moreover, replication technique shows potential accurately replicating fracture greater 20 μm, which far exceeds feature range on most metallic alloy framework establishes basis limits articles while providing reliable mechanics‐based

Language: Английский

Citations

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