DepthFM: Fast Monocular Depth Estimation with Flow Matching
<|reference_start|>DepthFM: Fast Monocular Depth Estimation with Flow Matching: Monocular depth estimation is crucial for numerous downstream vision tasks and applications. Current discriminative approaches to this problem are limited due to blurry artifacts, while state-of-the-art generative methods suffer from slow sampling due to their SDE nature. Rather than starting from noise, we seek a direct mapping from input image to depth map. We observe that this can be effectively framed using flow matching, since its straight trajectories through solution space offer efficiency and high quality. Our study demonstrates that a pre-trained image diffusion model can serve as an adequate prior for a flow matching depth model, allowing efficient training on only synthetic data to generalize to real images. We find that an auxiliary surface normals loss further improves the depth estimates. Due to the generative nature of our approach, our model reliably predicts the confidence of its depth estimates. On standard benchmarks of complex natural scenes, our lightweight approach exhibits state-of-the-art performance at favorable low computational cost despite only being trained on little synthetic data.<|reference_end|>
@article{gui2024depthfm:,
    title={DepthFM: Fast Monocular Depth Estimation with Flow Matching},
    author={Ming Gui and Johannes S. Fischer and Ulrich Prestel and Pingchuan Ma
  and Dmytro Kotovenko and Olga Grebenkova and Stefan Andreas Baumann and
  Vincent Tao Hu and Bj"orn Ommer},
    journal={arXiv preprint arXiv:2403.13788},
    year={2024},
    archivePrefix={arXiv},
    eprint={2403.13788},
    primaryClass={cs.CV}
}