DeepMapping: Unsupervised Map Estimation From Multiple Point Clouds

This repository contains PyTorch implementation associated with the paper:

"DeepMapping: Unsupervised Map Estimation From Multiple Point Clouds", Li Ding and Chen Feng, CVPR 2019 (Oral).

<p align="center"> <img src='./docs/resources/vis_2D_sample1.gif' width="250"> <img src='./docs/resources/vis_2D_sample2.gif' width="250"> <img src='./docs/resources/vis_2D_sample3.gif' width="250"> </p>

Citation

If you find DeepMapping useful in your research, please cite:

@InProceedings{Ding_2019_CVPR,
author = {Ding, Li and Feng, Chen},
title = {DeepMapping: Unsupervised Map Estimation From Multiple Point Clouds},
booktitle = {The IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
month = {June},
year = {2019}
}

Dependencies

Requires Python 3.x, PyTorch, Open3D, and other common packages listed in requirements.txt

pip3 install -r requirements.txt

Running on GPU is highly recommended. The code has been tested with Python 3.6.5, PyTorch 0.4.0 and Open3D 0.4.0

Getting Started

Dataset

Simulated 2D point clouds are provided as ./data/2D/all_poses.tar. Extract the tar file:

tar -xvf ./data/2D/all_poses.tar -C ./data/2D/

A set of sub-directories will be created. For example, ./data/2D/v1_pose0 corresponds to the trajectory 0 sampled from the environment v1. In this folder, there are 256 local point clouds saved in PCD file format. The corresponding ground truth sensor poses is saved as gt_pose.mat file, which is a 256-by-3 matrix. The i-th row in the matrix represent the sensor pose [x,y,theta] for the i-th point cloud.

Solving Registration As Unsupervised Training

To run DeepMapping, execute the script

./script/run_train_2D.sh

By default, the results will be saved to ./results/2D/.

Warm Start

DeepMapping allows for seamless integration of a “warm start” to reduce the convergence time with improved performance. Instead of starting from scratch, you can first perform a coarse registration of all point clouds using incremental ICP

./script/run_icp.sh

The coarse registration can be further improved by DeepMapping. To do so, simply set INIT_POSE=/PATH/TO/ICP/RESULTS/pose_est.npy in ./script/run_train_2D.sh. Please see the comments in the script for detailed instruction.

Evaluation

The estimated sensor pose is saved as numpy array pose_est.npy. To evaluate the registration, execute the script

./script/run_eval_2D.sh

Absolute trajectory error will be computed as error metrics.

Related Project

DeepMapping2 (CVPR'2023) for large-scale LiDAR mapping