BTFDBB: BTF Datenbank Bonn und Messlabor

UBO2014 Datasets

Update (2014/12/11): The synthetic data has just been added!

Here you can download the material appearance as compressed BTF files for a number of material samples that have been captured using the Dome I setup of our department. Per material sample, a full BTF has been measured using the bi-directional sampling of 151 viewing directions and 151 lighting directions, where the cameras are uniformly distributed on a hemispherical gantry. For lighting, we use the flashes of the cameras.

Currently, our database consists of 7 semantic categories. Each of these 7 material categories contains measurements of 12 different material instances for being capable to represent the corresponding intra-class variances. Per material sample, a full BTF has been measured using the bi-directional sampling of 151 viewing directions and 151 lighting directions. Consequently, a total of 22,801 images have been acquired for material samples with a size of 5 cm x 5 cm with spatial resolution of 512 x 512 texels. The available BTFs contain the central 400 x 400 texels (corresponding to an area of approx. 3.9 cm x 3.9 cm).

We offer two types of BTFs: Decorrelated Full-Matrix-Factorization (DFMF)-BTFs and BTFs resampled with respect to the surface geometry which has been measured using structured light. This allows rendering realistic silhouettes and helps to reduce compression artifacts which are caused by a blurring of surface details. This blurring results from parallax effects at regions significantly protruding from the modeled reference surface.

Besides the BTF data, there are archives of synthetic renderings for each of the materials under various environmental illuminations. Per material there is an uncompressed tar archive containing folders for each of the five used environments. Inside these subfolders there are high dynamic range renderings in the OpenEXR format, whose filenames have the form: img_phi_theta_distance_envrot.exr

Description of the parameters:

  • phi (azimuth angle) in {0.0°; 22.5°; 45.0°} and theta (inclination angle) in {-67.5°;-45.0°;-22.5°; 0.0°; 22.5°; 45.0°; 67.5°} represent the rotation of the material sample w.r.t. the camera
  • distance represents the distance of the material sample to the camera
  • envrot represents the rotation of the environments (used to increase the intra-class variances)

All datasets are free to use, modify and re-distribute for research and scholarship purposes. Furthermore, permission is granted to publish images made using the BTF data in a scholarly article or book, as long as proper credit is given to the University of Bonn's BTF Database. Any usage of the datasets for commercial purposes is not allowed without our permission and in some cases the permission of third parties. For more information about the databases, please refer to:

Michael Weinmann, externJuergen Gall and Reinhard Klein. extern"Material Classification based on Training Data Synthesized Using a BTF Database", accepted at ECCV 2014. Please externcite this work when using the datasets.

General information:

You can access the data either using your web browser and download directly from this page or use our anonymous FTP server: externftp://btf.cs.uni-bonn.de. The data is provided in a compressed binary format. Examplary code for reading and decoding these files is available on externgithub.

Note:
Some users encountered problems using certain browsers with the provided FTP links. A native FTP client using active-mode will work in these cases.


OVERVIEW

carpet  carpet01carpet02carpet03carpet04carpet05carpet06carpet07carpet08carpet09carpet10carpet11carpet12
fabric  fabric01fabric02fabric03fabric04fabric05fabric06fabric07fabric08fabric09fabric10fabric11fabric12
felt  felt01felt02felt03felt04felt05felt06felt07felt08felt09felt10felt11felt12
leather  leather01leather02leather03leather04leather05leather06leather07leather08leather09leather10leather11leather12
stone  stone01stone02stone03stone04stone05stone06stone07stone08stone09stone10stone11stone12
wallpaper  wallpaper01wallpaper02wallpaper03wallpaper04wallpaper05wallpaper06wallpaper07wallpaper08wallpaper09wallpaper10wallpaper11wallpaper12
wood  wood01wood02wood03wood04wood05wood06wood07wood08wood09wood10wood11wood12