A new method for the recovery and evidential comparison of footwear impressions using 3D structured light scanning

Thompson, Tim; Norris, Pippa

doi:10.1016/j.scijus.2018.02.001

Cited by 23 publications

(19 citation statements)

References 17 publications

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“…41,44 Moreover, the scanning must be preceded by the geometric calibration process that uses a very robust and accurate algorithm. [46][47][48][49][50] However, the 3D reconstruction process of the injuries of the live subjects faced some difficulties, for example, slight change of the posture of the scanned area (mainly areas of the lower limb) caused overlapping artefact in the final 3D result; however, scanning the area more than three times and post-processing only the scans that had the same posture solved this issue.…”

Section: Discussionmentioning

confidence: 99%

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Documentation and analysis of traumatic injuries in clinical forensic medicine involving structured light three-dimensional surface scanning versus photography

Shamata

Thompson

2018

Journal of Forensic and Legal Medicine

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Non-contact three-dimensional (3D) surface scanning has been applied in forensic medicine and has been shown to mitigate shortcoming of traditional documentation methods. The aim of this paper is to assess the efficiency of structured light 3D surface scanning in recording traumatic injuries of live cases in clinical forensic medicine. The work was conducted in Medico-Legal Centre in Benghazi, Libya. A structured light 3D surface scanner and ordinary digital camera with close-up lens were used to record the injuries and to have 3D and two-dimensional (2D) documents of the same traumas. Two different types of comparison were performed. Firstly, the 3D wound documents were compared to 2D documents based on subjective visual assessment. Additionally, 3D wound measurements were compared to conventional measurements and this was done to determine whether there was a statistical significant difference between them. For this, Friedman test was used. The study established that the 3D wound documents had extra features over the 2D documents. Moreover; the 3D scanning method was able to overcome the main deficiencies of the digital photography. No statistically significant difference was found between the 3D and conventional wound measurements. The Spearman's correlation established strong, positive correlation between the 3D and conventional measurement methods. Although, the 3D surface scanning of the injuries of the live subjects faced some difficulties, the 3D results were appreciated, the validity of 3D measurements based on the structured light 3D scanning was established. Further work will be achieved in forensic pathology to scan open injuries with depth information.

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Section: Discussionmentioning

confidence: 99%

“…The Pico Scan 3D scanner has been used in some forensic works and shown to be effective in scanning some materials of forensic interest, such as footwear impression, human skeleton remains as well as bare different areas of the human body of live subjects. [46][47][48][49] It has also been used in non-Forensic work. 50…”

Section: Documentation Methodsmentioning

confidence: 99%

Documentation and analysis of traumatic injuries in clinical forensic medicine involving structured light three-dimensional surface scanning versus photography

Shamata

Thompson

2018

Journal of Forensic and Legal Medicine

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“…Three-dimensional imaging, virtual environments, and simulations are now becoming commonplace in the reconstruction and documentation of crime scenes, artefacts, and skeletal evidence [9][10][11][12][13][14][15][16]. Ampanozi et al [17] demonstrated that the use of 3D reconstructions and colour-coded CT images were a preferred visual format for district attorneys for understanding radiological findings.…”

Section: Introductionmentioning

confidence: 99%

The effect of different imaging techniques for the visualisation of evidence in court on jury comprehension

et al. 2019

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Evidence presented within a courtroom should be clear so that the members of the jury can understand it. The presentation of distressing images, such as human remains, can have a negative effect on the jury since photographic images may evoke emotional responses. Therefore, it is important to understand how other visual mediums may improve comprehension, bias, or distress individuals. For this study, 91 individuals were randomly assigned one of three visual evidence formats in a mock courtroom exercise. These included photographs, 3D visualisations, or a 3D-printed model. The results show that the use of 3D imaging improves the juror's understanding of technical language used within a courtroom, which in turn better informs the juror's in their decision-making.

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“…In this article Komar et al (2012) stated that the software allows comparison between the two datasets and that the resulting 3D model is a useful tool for courtroom demonstration. This comparison has since been demonstrated by Thompson and Norris (2018), who evidenced the reliability of using structured light scanning. However, it has been noted that further work is needed before the structured light technique can replace traditional casting techniques (Thompson and Norris 2018;Crabbe et al 2015).…”

Section: 41mentioning

confidence: 77%

“…Structured light scanning has the ability to capture geometric, morphometric, and colour surface data (Sansoni 2009). Like the laser-based methods, Thompson and Norris (2018) demonstrated that structured light scanning is non-destructive, has fast acquisition and processing times, is portable, accurate, and reliable. The high computational power required to process the scan data is noted as a limitation (McPherron 2009).…”

Section: Structured Lightmentioning

confidence: 99%

Imaging in forensic science: Five years on

Carew

Errickson

2019

Journal of Forensic Radiology and Imaging

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The Journal of Forensic Radiology and Imaging was launched in 2013 with the aim to collate the literature and demonstrate high-quality case studies on image-based modalities across the forensic sciences. Largely, the focus of this journal has been on the transmissive aspect of forensic imaging, and therefore a significant number of high-quality case studies have been published focusing on computed tomography and magnetic resonance imaging. As a result, the 'and imaging' aspect is often neglected. Since 2013, technology has fundamentally evolved, and a number of new techniques have become accessible or have been demonstrated as particularly useful within many sub-disciplines of forensic science. These include active and passive surface scanning techniques, and the availability of three-dimensional printing. Therefore, this article discusses non-contact techniques, their applications, advantages, and considerations on the current state of play of imaging in forensic science. HIGHLIGHTS • We discuss the application of 3D imaging within the context of forensic science. • We highlight the available documentation techniques assessing their advantages and disadvantages. • This article provides several recommendations for future best practice. 1. 'and imaging' aspect is often neglected, despite there being substantial overlap between reflective and transmissive techniques. Numerous forensic science sub-disciplines have utilised these imaging techniques often in an inter-disciplinary manner. These include, but are not limited to, anthropology, archaeology, odontology, crime scene investigation, footwear mark recovery and analysis, courtroom visualisation, and ballistic comparison. Given that these rapidly evolving techniques are situated within the changing face of forensic science, this article has collated the current developments

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A new method for the recovery and evidential comparison of footwear impressions using 3D structured light scanning

Cited by 23 publications

References 17 publications

Documentation and analysis of traumatic injuries in clinical forensic medicine involving structured light three-dimensional surface scanning versus photography

Documentation and analysis of traumatic injuries in clinical forensic medicine involving structured light three-dimensional surface scanning versus photography

The effect of different imaging techniques for the visualisation of evidence in court on jury comprehension

Imaging in forensic science: Five years on

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