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首页> 外文会议>International symposium on multispectral image processing and pattern recognition >Visualization of Latent Fingerprints beneath Opaque Electrical Tapes by Optical Coherence Tomography
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Visualization of Latent Fingerprints beneath Opaque Electrical Tapes by Optical Coherence Tomography

机译：通过光学相干断层扫描技术可视化不透明胶带下方的潜在指纹

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摘要

Electrical tape is found as one type of important trace evidence in crime scene. For example, it is very frequently used to insulate wires in explosive devices in many criminal cases. The fingerprints of the suspects were often left on the adhesive side of the tapes, which can provide very useful clues for the investigation and make it possible for individual identification. The most commonly used method to detect and visualize those latent fingerprints is to peel off each layer of the tapes first and then adopt the chemical methods to develop the fingerprints on the tapes. However, the peeling-off and chemical development process would degrade and contaminate the fingerprints and thus adversely affect the accuracy of identification. Optical coherence tomography (OCT) is a novel forensic imaging modality based on low-coherence interferometry, which has the advantages of non-destruction, micrometer-level high resolution and cross-sectional imaging. In this study, a fiber-based spectral-domain OCT (SD-OCT) system with ~6μm resolution was employed to obtain the image of fingerprint sandwiched between two opaque electrical tapes without any pre-processing procedure like peeling-off. Three-dimensional (3D) OCT reconstruction was performed and the subsurface image was produced to visualize the latent fingerprints. The results demonstrate that OCT is a promising tool for recovering the latent fingerprints hidden beneath opaque electrical tape non-destructively and rapidly.
机译：在犯罪现场，发现电气胶带是重要的痕迹证据之一。例如，在许多刑事案件中，它经常用于绝缘爆炸装置中的电线。犯罪嫌疑人的指纹通常留在胶带的粘贴面上，这可以为调查提供非常有用的线索，并可以进行个人识别。检测和可视化那些潜在指纹的最常用方法是先剥掉胶带的每一层，然后采用化学方法在胶带上显影指纹。但是，剥离和化学显影过程会降解并污染指纹，从而对识别的准确性产生不利影响。光学相干断层扫描（OCT）是一种基于低相干干涉技术的新型法医成像手段，具有无损，微米级高分辨率和截面成像的优势。在这项研究中，采用了具有〜6μm分辨率的基于光纤的光谱域OCT（SD-OCT）系统来获取夹在两个不透明胶带之间的指纹图像，而无需进行任何诸如剥落之类的预处理程序。进行了三维（3D）OCT重建，并生成了地下图像以可视化潜在指纹。结果表明，OCT是一种有希望的工具，可以无损，快速地恢复隐藏在不透明电气胶带下的潜在指纹。

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