3D Photogrammetric-Data for KK13-09

Research data (*.las, *.ply and *.obj format) which was obtained by Photogrammetric/Computer Vision 3D digitization as well as original images which were the base for the 3D reconstruction process. Explanation about the 3D data format: Las (Is the normal data format for laser scanned point cloud data and also for photogrammetric 3D model.) Ply or Ply + jpg (The software RealityCapture encoded texture mesh in a single ply file while the software Agisoft metashape exported textured mesh in ply format + .jpg.) Obj + mtl + jpg (Obj stores a texture mesh together with mtl and jpg file. Obj file contains information of geometric vertices, texture vertices, vertex normal, polygon face element etc. The Mtl file defines the texture information of the faces. Mtl normally refers to a jpg for storing the actual texture.) Explanation about the mask image (if available): To avoid lots of background information in the 3D reconstruction process, well-aligned images to generate a rough model were applied. Afterwards a mask for each image could be calculated according to the 3D model. In the next step, original images together with the corresponding masks are applied to implement the reconstruction, which is free from the influence of the background information. This dataset is part of the digital gyroscope collection. For more information about the collection and its creation, please see the documentation dataset: Niklaus, Maria, 2021, "Information about the Gyrolog data repository", doi: 10.18419/darus-821, DaRUS.To refer to the whole collection: Wagner, Jörg F.; Ceranski, Beate; Fritsch, Dieter; Mammadov, Gasim; Niklaus, Maria; Schweizer, Timo; Simon, Sven; Zhan, Kun, 2021, "Digital Gyroscope Collection Created by the Project 'Gyrolog'", doi: 10.18419/darus-gyrolog, DaRUS.

本数据集包含通过摄影测量/计算机视觉三维数字化技术获取的研究数据（格式为*.las、*.ply及*.obj），以及作为三维重建流程基础的原始影像。

三维数据格式说明：
LAS格式：是激光扫描点云数据及摄影测量三维模型的标准数据格式。
PLY格式（或PLY+JPG）：RealityCapture软件将纹理网格编码至单个PLY文件中；Agisoft Metashape软件则将带纹理的网格以PLY格式配合JPG文件的形式导出。
OBJ+MTL+JPG格式：OBJ文件可存储纹理网格的相关信息，需配合MTL与JPG文件共同使用。其中，OBJ文件包含几何顶点、纹理顶点、顶点法线、多边形面元素等信息；MTL文件用于定义多边形面的纹理属性，通常会关联JPG文件以存储实际的纹理数据。

掩膜影像说明（若数据集包含该类文件）：
为避免三维重建流程中引入过多无关背景信息，首先使用对齐精度良好的影像生成粗略三维模型，随后可基于该粗略模型为每张影像计算对应的掩膜。后续将原始影像与对应的掩膜配合使用，即可实现不受背景信息干扰的三维重建流程。

本数据集属于数字陀螺仪馆藏的一部分。如需了解该馆藏及其构建的更多细节，请参阅数据集文档：Niklaus, Maria, 2021, "关于Gyrolog数据仓库的说明", doi: 10.18419/darus-821, DaRUS。如需完整引用该馆藏，请参考以下文献：Wagner, Jörg F.; Ceranski, Beate; Fritsch, Dieter; Mammadov, Gasim; Niklaus, Maria; Schweizer, Timo; Simon, Sven; Zhan, Kun, 2021, "Gyrolog项目构建的数字陀螺仪馆藏", doi: 10.18419/darus-gyrolog, DaRUS。