ShoeCase: A data set of mock crime scene footwear impressions
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This project's main objective is to create an open-source database containing a sizeable number of high-quality images of shoe impressions. The team at the Center for Statistics and Applications in Forensic Evidence (CSAFE) worked to collect images that could be representative of those found at crime scenes and made publicly available to the broader forensic and research communities. With mixed impression types (full blood impression, partial blood impression, and dust), flooring (vinyl and tile), lift techniques (gel lifts), and digital file types (TIF, XMP, CR3, and JPG). Our data was collected with the intention of reproducibility, using simple but specific protocols and easily accessible materials. The complete dataset includes 936 unique shoeprint images contained in 3,275 digital files. Data collection consisted of trained volunteers making shoe impressions on flooring with the 2 mediums: Spatter blood and graphite powder. They would wear the shoe, step in the material, and then walk on the flooring. For the blood prints a separate “lighter” step was made for a partial print. The blood prints were brought to the photography station where researchers labelled it and took a photograph. Graphite prints were covered with a gel lifter before being brought to the photography room. There the researchers removed the lift, then labeled and photographed it. We hope that our data will be of significant use for researchers, examiners, and anyone that could benefit from the use of a large dataset like this. Footwear datasets are often difficult to find, especially ones that resemble crime scenes, so our data can help fill that gap.
本项目的核心目标是构建一个开源数据库，收录海量高质量鞋印图像。由法医统计与应用中心（Center for Statistics and Applications in Forensic Evidence, CSAFE）的团队负责采集，所获图像可模拟犯罪现场常见的鞋印形态，并向法医领域与科研界的广大从业者公开。该数据集涵盖多种印模类型（全血印模、部分血印模与粉尘印模）、多种承痕基底（乙烯基地板与瓷砖）、采用凝胶提取法，以及多种数字文件格式（TIF、XMP、CR3与JPG）。 本数据集的采集遵循可复现原则，采用简洁且标准化的操作流程与易于获取的实验材料。完整数据集包含936枚独特鞋印图像，对应3275个数字文件。 数据采集由经过培训的志愿者完成：志愿者穿着目标鞋子，踩踏两种介质——溅射血液与石墨粉后，在承痕地面行走。其中血印需额外完成一次"轻踩"动作以生成部分血印。血印样本会被送至摄影工作站，由研究人员标注后进行拍摄；石墨粉印则需先使用凝胶提取膜覆盖，再移送至摄影室，研究人员取下提取膜后完成标注与拍摄。 我们期望本数据集可为科研人员、法医鉴定人员及其他可从中获益的群体提供重要支撑。鞋印类数据集往往难以获取，尤其是贴合犯罪现场场景的此类数据集，本数据集可填补这一领域的空白。
