UXOTi_NPA_1_class dataset
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Evaluation dataset <strong>UXOTi_NPA</strong>–an abbreviation that stands for UneXploded Ordnance Thermal images provided by Norwegian People's Aid–for this research was constructed as follows. The raw data was provided by the humanitarian organization Norwegian People’s Aid which collected videos about unexploded ordnances during a project in Bosnia and Herzegovina in 2019. Thermal imaging sensor was mounted on the UAV that surveyed the area at a height of 3 meters. A very small Ground Sampling Distance (GSD) was achieved with such a configuration. These videos were acquired by the thermal imager Zenmuse XT with a dimension of 720x480 pixels at 30 Hz frame rate. Pixel pitch was 17 μm, sensitivity (NEdT) <50mK at focal length f/1.0, and a field of view was 69°x56°. Videos were stored in mp4 format. Image sequences were grabbed from the full videos by using VirtualDub software. These clips were about 25 seconds long and show the UAV's flight over the targets. We annotated videos semi-automatically by using Computer Vision Annotation Tool (CVAT). Positions of objects’ annotations were manually corrected after every 5 to 6 frames. The evaluation dataset consists of 808 thermal images of dimensions of 720x480 pixels extracted from the above-described video clips, whenever at least one target (UXO) was present in the image. The number of objects per image varied between one to three.
本研究使用的评测数据集为**UXOTi_NPA**——其全称为未爆炸弹药热成像图像（UneXploded Ordnance Thermal images），由挪威人民援助会（Norwegian People's Aid）提供，数据集构建流程如下。 原始数据由人道主义组织挪威人民援助会提供，该组织于2019年在波斯尼亚和黑塞哥维那开展项目期间，采集了多段涉及未爆炸弹药（UneXploded Ordnance, UXO）的视频。本次搭载的热成像传感器安装于无人机（Unmanned Aerial Vehicle, UAV），该无人机在3米高度开展区域勘测，此配置实现了极小的地面采样距离（Ground Sampling Distance, GSD）。所用热成像仪为Zenmuse XT，视频分辨率为720×480像素，帧率30Hz，像素间距17μm，在f/1.0焦距下，其灵敏度（噪声等效温差，Noise Equivalent Temperature Difference, NEdT）小于50mK，视场角为69°×56°。视频以mp4格式存储。 通过VirtualDub软件从完整视频中提取图像序列，每段剪辑时长约25秒，内容为无人机飞越目标区域的飞行画面。本研究采用计算机视觉标注工具（Computer Vision Annotation Tool, CVAT）对半自动完成视频标注，并每隔5至6帧手动校正目标的标注位置。 本评测数据集共包含808张分辨率为720×480像素的热成像图像，均从上述视频剪辑中提取，且每张图像中至少包含一个未爆炸弹药（UXO）目标。单张图像中的目标数量介于1至3个之间。
