Feasibility study of linear trace identification based on laser scanning

The detection and identification of tool marks have always been an important research content in the field of forensic science and criminal science and technology. Traditional methods of tool trace inspection and identification usually rely on the experience and subjective judgment of experts. It is likely to lead to the analysis of judgment bias in the comparison process of the two differences. Therefor the digital extraction and analysis of linear trace has become a hot research topic for improve the reliability of linear trace analysis. In this paper, the single-point laser scanning device is used to extract linear traces on the surface of Aluminum wires. The validity and accuracy of linear trace alignment test are investigated. The matching results of linear traces on 10 fracture surfaces of varying diameters are calculated over a span of 15 seconds, with a success rate exceeding 80%. The results show that linear trace extraction can be used to identify and analyze tool traces.