Non-Identifiable Fingermarks from Unfired Ammunition in Handguns

Data Collected as part of National Institute of Justice Award 15PNIJ-21-GG-04192-RESS, Evaluation of the Occurrence and Associative Value of NonIdentifiable Fingermarks on Unfired Ammunition in Handguns for Evidence Supporting Proof of Criminal Possession, Use and Intent. The overall goal of this project was to answer the question of how often non-identifiable fingermarks occur on naturally loaded handgun ammunition and what range of associative values can be expected. The datasets include images of 415 Non-Identifiable Fingermarks. The Non-Identifiable Fingermark Dataset has original images in .tif format, whereas the Annotated Non-Identifiable Fingermark Dataset has processed images with annotation of fingermark minutiae. The accompanying spreadsheets contain summary information. The spreadsheet Marks by Round provides, for each of 1263 rounds of ammunition, the number of identifiable and non-identifiable fingermarks found, the number of annotated minutiae for the marks, the handgun type (semi-automatic vs. revolver) and the caliber class. The spreadsheet Marks by Handgun Load summarizes the results from each of the handguns sampled. The four caliber classes used were 22 (.22LR); 32 (.32 ACP); 38 (including .38 Special, .357 Magnum, .380 ACP and 9mm); and .45 (including .45 ACP, .45 Colt, .44 Magnum and .40 S&W).

本数据集源自美国国家司法研究所（National Institute of Justice）资助项目编号15PNIJ-21-GG-04192-RESS的研究成果，该项目主题为评估未发射手枪弹药上不可识别指印（Non-Identifiable Fingermarks）的出现情况及其关联价值，用于为刑事持有、使用及故意犯罪的举证提供支撑。本项目的核心目标是解答两个关键问题：自然装填的手枪弹药上，不可识别指印的出现频率如何，以及可预期的关联价值区间范围。本数据集包含415组不可识别指印的图像：其中不可识别指印数据集的原始图像格式为.tif格式，而带注释的不可识别指印数据集则包含带有指印细节点注释的处理后图像。随附的电子表格包含研究汇总信息：名为"Marks by Round"的表格针对1263发弹药分别记录了检出的可识别与不可识别指印数量、对应指印的注释细节点数量、手枪类型（半自动手枪 vs 转轮手枪）以及口径类别；名为"Marks by Handgun Load"的表格则汇总了所有采样手枪的研究结果。本次研究涵盖的四种口径类别分别为：.22（.22口径长步枪弹，.22LR）；.32（.32自动手枪弹，.32 ACP）；.38口径（含.38特种弹、.357马格南弹、.380自动手枪弹及9毫米弹）；以及.45口径（含.45自动手枪弹、.45柯尔特弹、.44马格南弹及.40 S&W弹）。