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README.md

ScanNet

ScanNet is an RGB-D video dataset containing 2.5 million views in more than 1500 scans, annotated with 3D camera poses, surface reconstructions, and instance-level semantic segmentations.

ScanNet Data

If you would like to download the ScanNet data, please fill out an agreement to the ScanNet Terms of Use and send it to us at scannet@googlegroups.com.

If you have not received a response within a week, it is likely that your email is bouncing - please check this before sending repeat requests.

Data Organization

The data in ScanNet is organized by RGB-D sequence. Each sequence is stored under a directory with named scene<spaceId>_<scanId>, or scene%04d_%02d, where each space corresponds to a unique location (0-indexed). The raw data captured during scanning, camera poses and surface mesh reconstructions, and annotation metadata are all stored together for the given sequence. The directory has the following structure:

<scanId>
|-- <scanId>.sens
    RGB-D sensor stream containing color frames, depth frames, camera poses and other data
|-- <scanId>_vh_clean.ply
    High quality reconstructed mesh
|-- <scanId>_vh_clean_2.ply
    Cleaned and decimated mesh for semantic annotations
|-- <scanId>_vh_clean_2.0.010000.segs.json
    Over-segmentation of annotation mesh
|-- <scanId>.aggregation.json, <scanId>_vh_clean.aggregation.json
    Aggregated instance-level semantic annotations on lo-res, hi-res meshes, respectively
|-- <scanId>_vh_clean_2.0.010000.segs.json, <scanId>_vh_clean.segs.json
    Over-segmentation of lo-res, hi-res meshes, respectively (referenced by aggregated semantic annotations)
|-- <scanId>_vh_clean_2.labels.ply
    Visualization of aggregated semantic segmentation; colored by nyu40 labels (see img/legend; ply property 'label' denotes the ScanNet label id)
|-- <scanId>_2d-label.zip
    Raw 2d projections of aggregated annotation labels as 16-bit pngs with ScanNet label ids
|-- <scanId>_2d-instance.zip
    Raw 2d projections of aggregated annotation instances as 8-bit pngs
|-- <scanId>_2d-label-filt.zip
    Filtered 2d projections of aggregated annotation labels as 16-bit pngs with ScanNet label ids
|-- <scanId>_2d-instance-filt.zip
    Filtered 2d projections of aggregated annotation instances as 8-bit pngs

Data Formats

The following are overviews of the data formats used in ScanNet:

Reconstructed surface mesh file (*.ply): Binary PLY format mesh with +Z axis in upright orientation.

RGB-D sensor stream (*.sens): Compressed binary format with per-frame color, depth, camera pose and other data. See ScanNet C++ Toolkit for more information and parsing code. See SensReader/python for a very basic python data exporter.

Surface mesh segmentation file (*.segs.json):

{
  "params": {  // segmentation parameters
   "kThresh": "0.0001",
   "segMinVerts": "20",
   "minPoints": "750",
   "maxPoints": "30000",
   "thinThresh": "0.05",
   "flatThresh": "0.001",
   "minLength": "0.02",
   "maxLength": "1"
  },
  "sceneId": "...",  // id of segmented scene
  "segIndices": [1,1,1,1,3,3,15,15,15,15],  // per-vertex index of mesh segment
}

Aggregated semantic annotation file (*.aggregation.json):

{
  "sceneId": "...",  // id of annotated scene
  "appId": "...", // id + version of the tool used to create the annotation
  "segGroups": [
    {
      "id": 0,
      "objectId": 0,
      "segments": [1,4,3],
      "label": "couch"
    },
  ],
  "segmentsFile": "..." // id of the *.segs.json segmentation file referenced
}

2d annotation projections (*_2d-label.zip, *_2d-instance.zip, *_2d-label-filt.zip, *_2d-instance-filt.zip): Projection of 3d aggregated annotation of a scan into its RGB-D frames, according to the computed camera trajectory.

ScanNet C++ Toolkit

Tools for working with ScanNet data. SensReader loads the ScanNet .sens data of compressed RGB-D frames, camera intrinsics and extrinsics, and IMU data.

Camera Parameter Estimation Code

Code for estimating camera parameters and depth undistortion. Required to compute sensor calibration files which are used by the pipeline server to undistort depth. See CameraParameterEstimation for details.

Mesh Segmentation Code

Mesh supersegment computation code which we use to preprocess meshes and prepare for semantic annotation. Refer to Segmentator directory for building and using code.

BundleFusion Reconstruction Code

ScanNet uses the BundleFusion code for reconstruction. Please refer to the BundleFusion repository at https://github.com/niessner/BundleFusion . If you use BundleFusion, please cite the original paper:

@article{dai2017bundlefusion,
  title={BundleFusion: Real-time Globally Consistent 3D Reconstruction using On-the-fly Surface Re-integration},
  author={Dai, Angela and Nie{\ss}ner, Matthias and Zoll{\"o}fer, Michael and Izadi, Shahram and Theobalt, Christian},
  journal={ACM Transactions on Graphics 2017 (TOG)},
  year={2017}
}

ScanNet Scanner iPad App

ScannerApp is designed for easy capture of RGB-D sequences using an iPad with attached Structure.io sensor.

ScanNet Scanner Data Server

Server contains the server code that receives RGB-D sequences from iPads running the Scanner app.

ScanNet Data Management UI

WebUI contains the web-based data management UI used for providing an overview of available scan data and controlling the processing and annotation pipeline.

ScanNet Semantic Annotation Tools

Code and documentation for the ScanNet semantic annotation web-based interfaces is provided as part of the SSTK library. Please refer to https://github.com/smartscenes/sstk/wiki/Scan-Annotation-Pipeline for an overview.

Benchmark Tasks

We provide code for several scene understanding benchmarks on ScanNet:

  • 3D object classification
  • 3D object retrieval
  • Semantic voxel labeling

Train/test splits are given at Tasks/Benchmark.
Label mappings and trained models can be downloaded with the ScanNet data release.

See Tasks.

Labels

The label mapping file (scannet-labels.combined.tsv) in the ScanNet task data release contains mappings from the labels provided in the ScanNet annotations (id) to the object category sets of NYUv2, ModelNet, ShapeNet, and WordNet synsets. Download with along with the task data (--task_data) or by itself (--label_map).

Citation

If you use the ScanNet data or code please cite:

@inproceedings{dai2017scannet,
    title={ScanNet: Richly-annotated 3D Reconstructions of Indoor Scenes},
    author={Dai, Angela and Chang, Angel X. and Savva, Manolis and Halber, Maciej and Funkhouser, Thomas and Nie{\ss}ner, Matthias},
    booktitle = {Proc. Computer Vision and Pattern Recognition (CVPR), IEEE},
    year = {2017}
}

Help

If you have any questions, please contact us at scannet@googlegroups.com

Changelog

License

The data is released under the ScanNet Terms of Use, and the code is released under the MIT license.

Copyright (c) 2017