Unseen Object Clustering: Learning RGB-D Feature Embeddings for Unseen Object Instance Segmentation

Introduction

In this work, we propose a new method for unseen object instance segmentation by learning RGB-D feature embeddings from synthetic data. A metric learning loss functionis utilized to learn to produce pixel-wise feature embeddings such that pixels from the same object are close to each other and pixels from different objects are separated in the embedding space. With the learned feature embeddings, a mean shift clustering algorithm can be applied to discover and segment unseen objects. We further improve the segmentation accuracy with a new two-stage clustering algorithm. Our method demonstrates that non-photorealistic synthetic RGB and depth images can be used to learn feature embeddings that transfer well to real-world images for unseen object instance segmentation. arXiv, Talk video

<p align="center"><img src="./data/pics/network.png" width="750" height="200"/></p>

License

Unseen Object Clustering is released under the NVIDIA Source Code License (refer to the LICENSE file for details).

Citation

If you find Unseen Object Clustering useful in your research, please consider citing:

@inproceedings{xiang2020learning,
    Author = {Yu Xiang and Christopher Xie and Arsalan Mousavian and Dieter Fox},
    Title = {Learning RGB-D Feature Embeddings for Unseen Object Instance Segmentation},
    booktitle = {Conference on Robot Learning (CoRL)},
    Year = {2020}
}

Required environment

• Ubuntu 16.04 or above
• PyTorch 0.4.1 or above
• CUDA 9.1 or above

Installation

1. Install PyTorch.

2. Install python packages

   pip install -r requirement.txt
   

Download

• Download our trained checkpoints from here, save to $ROOT/data.

Running the demo

1. Download our trained checkpoints first.

2. Run the following script for testing on images under $ROOT/data/demo.

   ./experiments/scripts/demo_rgbd_add.sh
   

<p align="center"><img src="./data/pics/demo_rgbd_add.png" width="640" height="360"/></p>

Training and testing on the Tabletop Object Dataset (TOD)

1. Download the Tabletop Object Dataset (TOD) from here (34G).

2. Create a symlink for the TOD dataset

   cd $ROOT/data
   ln -s $TOD_DATA tabletop
   

3. Training and testing on the TOD dataset

   cd $ROOT
   
   # multi-gpu training, we used 4 GPUs
   ./experiments/scripts/seg_resnet34_8s_embedding_cosine_rgbd_add_train_tabletop.sh
   
   # testing, $GPU_ID can be 0, 1, etc.
   ./experiments/scripts/seg_resnet34_8s_embedding_cosine_rgbd_add_test_tabletop.sh $GPU_ID $EPOCH
   
   

Testing on the OCID dataset and the OSD dataset

1. Download the OCID dataset from here, and create a symbol link:

   cd $ROOT/data
   ln -s $OCID_dataset OCID
   

2. Download the OSD dataset from here, and create a symbol link:

   cd $ROOT/data
   ln -s $OSD_dataset OSD
   

3. Check scripts in experiments/scripts with name test_ocid or test_ocd. Make sure the path of the trained checkpoints exist.

   experiments/scripts/seg_resnet34_8s_embedding_cosine_rgbd_add_test_ocid.sh
   experiments/scripts/seg_resnet34_8s_embedding_cosine_rgbd_add_test_osd.sh
   
   

Running with ROS on a Realsense camera for real-world unseen object instance segmentation

• Python2 is needed for ROS.

• Make sure our pretrained checkpoints are downloaded.

  # start realsense
  roslaunch realsense2_camera rs_aligned_depth.launch tf_prefix:=measured/camera
  
  # start rviz
  rosrun rviz rviz -d ./ros/segmentation.rviz
  
  # run segmentation, $GPU_ID can be 0, 1, etc.
  ./experiments/scripts/ros_seg_rgbd_add_test_segmentation_realsense.sh $GPU_ID
  

Our example:

<p align="center"><img src="./data/pics/unseen_clustering.gif"/></p>