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Paper · 2104.05327 · 2021

MinkLoc++: Lidar and Monocular Image Fusion for Place Recognition

arXiv · PDF · Open in the Atlas

Code that ran

We lifted 5 functions out of this paper's own repositories and ran 3 of them in a sandbox. "Ran" means the function executed on a synthesized input and returned a value. It is not a reproduction of the paper's results.

RepositoryRoleRan
jac99/MinkLocMultimodal canonical 3 of 5
FunctionStatusWhere it lives
get_max_per_row Ran jac99/MinkLocMultimodal/models/loss.py
code served (permissive licence) · get_code("cf42d9b216f9481c")
get_min_per_row Ran jac99/MinkLocMultimodal/models/loss.py
code served (permissive licence) · get_code("4bd72deb0a0b5897")
tensor2img Ran jac99/MinkLocMultimodal/datasets/augmentation.py
code served (permissive licence) · get_code("ffc92c5bb8278ff1")
image4lidar Not yet run jac99/MinkLocMultimodal/datasets/oxford.py
code served (permissive licence) · get_code("a443d3b499a823b6")
ts_from_filename Not yet run jac99/MinkLocMultimodal/datasets/oxford.py
code served (permissive licence) · get_code("7cd8433380d56d84")

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Abstract

We introduce a discriminative multimodal descriptor based on a pair of sensor readings: a point cloud from a LiDAR and an image from an RGB camera. Our descriptor, named MinkLoc++, can be used for place recognition, re-localization and loop closure purposes in robotics or autonomous vehicles applications. We use late fusion approach, where each modality is processed separately and fused in the final part of the processing pipeline. The proposed method achieves state-of-the-art performance on standard place recognition benchmarks. We also identify dominating modality problem when training a multimodal descriptor. The problem manifests itself when the network focuses on a modality with a larger overfit to the training data. This drives the loss down during the training but leads to suboptimal performance on the evaluation set. In this work we describe how to detect and mitigate such risk when using a deep metric learning approach to train a multimodal neural network. Our code is publicly available on the project website: https://github.com/jac99/MinkLocMultimodal.

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