earticle

영어

Tool marks are critical forensic evidence significantly influencing crime scene interpretation, necessitating continuous research to enhance analysis accuracy. This study applies three-dimensional (3D) shape comparison techniques to analyze impression marks created by tools. Using a 3D microscope, we observed and compared tool marks produced by two types of screwdrivers on metal can lids, confirming the potential of 3D microscopy for tool mark analysis. We developed an objective and accurate method for identifying tool mark similarity by calculating cross-correlation coefficients between 3D shapes of different tool marks. The results demonstrated high similarity between tool marks from the same tool, with maximum cross-correlation coefficients averaging 0.9268575, compared to 0.757101 for marks from different tools, validating the effectiveness of 3D shape analysis for tool mark identification. However, limitations, such as a 0.2 mm measurement error and minor differences in correlation coefficients between matching and non-matching toolmarks, suggest the need for further research into improving the error detection capability and optimizing experimental conditions for enhancing impression mark differentiation.