Three-dimensional surface reconstruction for cartridge cases using photometric stereo

Sakarya, Ufuk; Leloglu, Ugur Murat; Tunalı, Erol

doi:10.1016/j.forsciint.2007.07.003

Cited by 28 publications

(17 citation statements)

References 6 publications

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“…These research efforts have shown that topography measurements in 3D allow good accuracy, while at the same time, maintaining a high level of reproducibility. The main objectives of the statistical analysis carried out in these previous studies were either to measure the global discrimination power of the 3D system, establishing the respective error rates (often used to assess the discrimination power of the analyzed impressions) , or to measure the efficiency of these systems when they are used in the context of a database search . The objective of the present study is different as it aims to obtain an objective assignment of the weight of the evidence derived from a set of observations between two entities measured in 3D.…”

Section: Purpose Of the Researchmentioning

confidence: 99%

Automatic Comparison and Evaluation of Impressions Left by a Firearm on Fired Cartridge Cases

Riva

Champod

2014

Journal of Forensic Sciences

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Recent years have been characterized by a series of publications in the field of firearms investigation questioning the reliability and objectivity of such examination. This research investigates new solutions to decrease the subjective component affecting the evaluation that follows the comparison of impressions left by a firearm on the surface of spent cartridge cases. An automatic comparison system based on 3D measurements has been developed and coupled to a bivariate evaluative model allowing assigning likelihood ratios. Based on a dataset of 79 pistols (all SIG Sauer 9 mm Luger caliber), the system shows a very high discriminating power and the LRs that it provides are very indicative of the true state under both the prosecution and the defense propositions. For example, likelihood ratios exceeding a billion are predominantly obtained when impressions originating from the same source are compared. The system is also characterized by relatively low rates (≤ 1%) of misleading evidence depending on the firearm considered.

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Section: Purpose Of the Researchmentioning

confidence: 99%

Automatic Comparison and Evaluation of Impressions Left by a Firearm on Fired Cartridge Cases

Riva

Champod

2014

Journal of Forensic Sciences

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“…No experimental evaluation is presented in this work. Sakarya et al [18] suggest a system based on photometric stereo for surface measurement of cartridges. Suapang et al [19] introduce an acquisition system based on a CCD camera and a rotary device to acquire 2D images as well as line-scans of specimens.…”

Section: Related Workmentioning

confidence: 99%

Automated Firearm Identification

Fischer

Vielhauer

2015

Proceedings of the 3rd ACM Workshop on Information Hiding and Multimedia Security

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The examination of firearm related toolmarks impressed to cartridges and bullets is a well known forensic discipline. The application of three dimensional imaging systems and pattern recognition techniques for automatic comparison and matching of topographic data is a central field of research in the domain of digital crime scene analysis. In this work, we introduce and evaluate a novel Multiple-Slice-Shape (MSS) approach with the objective to closer link the preprocessing and feature extraction stages and improve the automated examinations of firearm toolmark surface data. We employ two existing features which are applied to the topography of firing pin impressions and aim at an automatic matching of the shapes based on multiple line-profile measurement. We suggest several modifications of the original Multiple-Angle-Path (MAP) and Multiple-Circle-Path (MCP) features to achieve an optimal integration into the proposed processing pipeline. Our evaluation approach is three-fold. First, we aim at the determination of an initial parameterization for MSS processing and feature extraction. Second, we evaluate the accuracy of discrimination for two firearms of the same mark and model. Third, we evaluate the accuracy using six different weapons. The test set contains 72 cartridge samples including six guns and three ammunition manufactures. Regarding the first evaluation, the results indicate an improvement of the accuracy for both features. Regarding the second evaluation, the achieved accuracy ranges between 67% and 100% for the MAP feature, and between 92% and 100% for the MCP feature. With respect to the third evaluation, the best result is achieved for MAP 32 with 73% and for MCP 15 with 92% compared to 56% and 82% correct classification rate regarding the original versions. It is supposed that various 3D spatial features can be combined and maybe improved by using the proposed MSS approach. We motivate the evaluation of this question for future work.

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“…So far, the photometric stereo imaging and reconstruction technique has been used in many applications, for example, face and fingerprints reconstruction and recognition in biometrics, 32-34 cartridge cases surface reconstruction in forensics, 35 surface reconstruction of artist paintings 36 and melanin segmentation in dermatology, 37 etc. But as to the authors' knowledge, there has been no study on detecting pre-signs of ulceration on diabetic foot using photometric stereo technique .…”

Section: Overview Of Photometric Stereo Techniquementioning

confidence: 99%

Towards surface analysis on diabetic feet soles to predict ulcerations using photometric stereo

Liu

Heijden

Netten

2012

Advanced Biomedical and Clinical Diagnostic Systems X

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Diabetic foot ulceration is a major complication for patients with diabetes mellitus. Approximately 15% to 25% of patients with Type I and Type II diabetes eventually develop feet ulcers. If not adequately treated, these ulcers may lead to foot infection, and ultimately to total (or partial) lower extremity amputation, which means a great loss in health-related quality of life. The incidence of foot ulcers may be prevented by early identification and subsequent treatment of pre-signs of ulceration, such as callus formation, redness, fissures, and blisters. Therefore, frequent examination of the feet is necessary, preferably on a daily basis. However, self-examination is difficult or impossible due to consequences of the diabetes. Moreover, frequent examination by health care professionals is costly and not feasible. The objective of our project is to develop an intelligent telemedicine monitoring system that can be deployed at the patients' home environment for frequent examination of patients feet, to timely detect pre-signs of ulceration. The current paper reports the preliminary results of an implementation of a photometric stereo imaging system to detect 3D geometric abnormalities of the skin surfaces of foot soles. Using a flexible experimental setup, the system parameters such as number and positions of the illuminators have been selected so as to optimize the performance with respect to reconstructed surface. The system has been applied to a dummy foot sole. Finally, the curvature on the resulting 3D topography of the foot sole is implemented to show the feasibility of detecting the pre-signs of ulceration using photometric stereo imaging. The obtained results indicate clinical potential of this technology for detecting the pre-signs of ulceration on diabetic feet soles.

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Three-dimensional surface reconstruction for cartridge cases using photometric stereo

Cited by 28 publications

References 6 publications

Automatic Comparison and Evaluation of Impressions Left by a Firearm on Fired Cartridge Cases

Automatic Comparison and Evaluation of Impressions Left by a Firearm on Fired Cartridge Cases

Automated Firearm Identification

Towards surface analysis on diabetic feet soles to predict ulcerations using photometric stereo

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