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Non-invasive, optical latent fingerprint acquisition from cartridge casings: A first feasibility study using a laser-scanning confocal microscope

机译：从墨盒外壳获取无创光学潜像指纹：使用激光扫描共聚焦显微镜的首次可行性研究

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Technologies and partly automated systems for the support of forensic criminalistic examinations are currently an important field of research with rising importance. Specifically the application of contact-less, optical sensors and subsequent signal processing techniques for the acquisition and enhancement of latent fingerprints from nonabsorbent surfaces are at present important fields of research. In this work a series of tests is performed to investigate the general feasibility of a laser-scanning confocal microscope for the task of latent fingerprint acquisition on cartridge casings. For our first evaluation we are using flattened as well as original shaped cartridge casings and we are scanning previously determined regions with latent fingerprints. Fingerprints have been provided by three different donors and cartridges of three different manufactures are used. The prints are applied on the cartridges after firing and non aged fingerprints are used. According to an existing suggested benchmarking scheme we are using a differential image approach to judge the sensors capability of acquiring these traces. No automated feature extraction is done yet and the quality of the results is assessed in a quantitative and a qualitative fashion. Furthermore, we will provide some very first enhancement experiments using signal processing techniques for enhancing the captured fingerprint representation. Even though our test set is limited and the results are of preliminary nature we provide a proof of concept that the sensor is able to capture the desired traces. Additionally, we are giving an outlook what techniques should be addressed in future work to design an imaging system for acquisition and extraction of latent fingerprints on cartridge casings.
机译：支持法医犯罪检查的技术和部分自动化的系统目前是一个重要的研究领域，并且具有越来越高的重要性。特别地，用于从非吸收性表面获取和增强潜在指纹的非接触式光学传感器和后续信号处理技术的应用是当前的重要研究领域。在这项工作中，进行了一系列测试，以研究激光扫描共聚焦显微镜在墨盒外壳上进行潜在指纹采集的总体可行性。对于我们的第一次评估，我们使用扁平的和原始形状的墨盒外壳，并在扫描带有潜在指纹的先前确定的区域。指纹已由三个不同的供体提供，并且使用了三个不同制造商的墨盒。射击后，将照片打印在墨盒上，并使用未老化的指纹。根据现有的建议基准测试方案，我们正在使用差分图像方法来判断传感器获取这些迹线的能力。尚未进行自动特征提取，并且以定量和定性的方式评估结果的质量。此外，我们将提供一些最先使用信号处理技术的增强实验，以增强捕获的指纹表示。即使我们的测试集有限并且结果只是初步性质，我们仍提供了概念证明，即传感器能够捕获所需的迹线。此外，我们展望了在未来的工作中应设计什么技术来设计成像系统，以采集和提取墨盒外壳上的潜在指纹。

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