no code implementations • 11 Mar 2025 • Tianxiang Lin, Mohamad Qadri, Kevin Zhang, Adithya Pediredla, Christopher A. Metzler, Michael Kaess
We consider the problem of optimizing neural implicit surfaces for 3D reconstruction using acoustic images collected with drifting sensor poses.
no code implementations • 31 Dec 2024 • Tianfu Wang, Mingyang Xie, Haoming Cai, Sachin Shah, Christopher A. Metzler
Transparent surfaces, such as glass, create complex reflections that obscure images and challenge downstream computer vision applications.
no code implementations • 10 Dec 2024 • Jingxi Chen, Brandon Y. Feng, Haoming Cai, Tianfu Wang, Levi Burner, Dehao Yuan, Cornelia Fermuller, Christopher A. Metzler, Yiannis Aloimonos
In this work, we overcome the limited data challenge by adapting pre-trained video diffusion models trained on internet-scale datasets to EVFI.
no code implementations • 3 Oct 2024 • Mingyang Xie, Haoming Cai, Sachin Shah, Yiran Xu, Brandon Y. Feng, Jia-Bin Huang, Christopher A. Metzler
We introduce a simple yet effective approach for separating transmitted and reflected light.
no code implementations • 5 Jun 2024 • Tianyi Xiong, Jiayi Wu, Botao He, Cornelia Fermuller, Yiannis Aloimonos, Heng Huang, Christopher A. Metzler
By combining differentiable rendering with explicit point-based scene representations, 3D Gaussian Splatting (3DGS) has demonstrated breakthrough 3D reconstruction capabilities.
no code implementations • CVPR 2024 • Mingyang Xie, Haiyun Guo, Brandon Y. Feng, Lingbo Jin, Ashok Veeraraghavan, Christopher A. Metzler
Imaging through scattering media is a fundamental and pervasive challenge in fields ranging from medical diagnostics to astronomy.
no code implementations • 18 Mar 2024 • Matthew R. Ziemann, Christopher A. Metzler
Our waveforms are designed to follow a distribution that is indistinguishable from the ambient radio frequency (RF) background -- while still being effective at ranging and sensing.
1 code implementation • 23 Feb 2024 • Xi Chen, Zhewen Hou, Christopher A. Metzler, Arian Maleki, Shirin Jalali
We investigate both the theoretical and algorithmic aspects of likelihood-based methods for recovering a complex-valued signal from multiple sets of measurements, referred to as looks, affected by speckle (multiplicative) noise.
1 code implementation • 5 Feb 2024 • Matthew A. Chan, Maria J. Molina, Christopher A. Metzler
Estimating and disentangling epistemic uncertainty, uncertainty that is reducible with more training data, and aleatoric uncertainty, uncertainty that is inherent to the task at hand, is critically important when applying machine learning to high-stakes applications such as medical imaging and weather forecasting.
no code implementations • 5 Feb 2024 • Mohamad Qadri, Kevin Zhang, Akshay Hinduja, Michael Kaess, Adithya Pediredla, Christopher A. Metzler
Underwater perception and 3D surface reconstruction are challenging problems with broad applications in construction, security, marine archaeology, and environmental monitoring.
no code implementations • ICCV 2023 • Sachin Shah, Sakshum Kulshrestha, Christopher A. Metzler
We then demonstrate, in simulation, that time-averaged dynamic (TiDy) phase masks can offer substantially improved monocular depth estimation and extended depth-of-field imaging performance.
no code implementations • 16 Mar 2023 • Matthew A. Chan, Sean I. Young, Christopher A. Metzler
Many imaging inverse problems$\unicode{x2014}$such as image-dependent in-painting and dehazing$\unicode{x2014}$are challenging because their forward models are unknown or depend on unknown latent parameters.
no code implementations • 26 Dec 2022 • Rushil Joshi, Ethan Adams, Matthew Ziemann, Christopher A. Metzler
The United States coastline spans 95, 471 miles; a distance that cannot be effectively patrolled or secured by manual human effort alone.
Weakly-supervised Learning
Weakly supervised segmentation
+2
no code implementations • 18 Sep 2022 • Kevin Zhang, Mingyang Xie, Maharshi Gor, Yi-Ting Chen, Yvonne Zhou, Christopher A. Metzler
Deep image prior (DIP) is a recently proposed technique for solving imaging inverse problems by fitting the reconstructed images to the output of an untrained convolutional neural network.
2 code implementations • 9 Jun 2022 • Saurav K. Shastri, Rizwan Ahmad, Christopher A. Metzler, Philip Schniter
To solve inverse problems, plug-and-play (PnP) methods replace the proximal step in a convex optimization algorithm with a call to an application-specific denoiser, often implemented using a deep neural network (DNN).
no code implementations • 13 Mar 2022 • Brandon Yushan Feng, Mingyang Xie, Christopher A. Metzler
We present a self-supervised and self-calibrating multi-shot approach to imaging through atmospheric turbulence, called TurbuGAN.
no code implementations • 7 Feb 2022 • Sean I. Young, Adrian V. Dalca, Enzo Ferrante, Polina Golland, Christopher A. Metzler, Bruce Fischl, Juan Eugenio Iglesias
SUD unifies stochastic averaging and spatial denoising techniques under a spatio-temporal denoising framework and alternates denoising and model weight update steps in an optimization framework for semi-supervision.
1 code implementation • 25 Oct 2020 • Christopher A. Metzler, Gordon Wetzstein
Plug and play (P&P) algorithms iteratively apply highly optimized image denoisers to impose priors and solve computational image reconstruction problems, to great effect.
1 code implementation • 25 Oct 2020 • Ruangrawee Kitichotkul, Christopher A. Metzler, Frank Ong, Gordon Wetzstein
Convolutional neural networks (CNN) have emerged as a powerful tool for solving computational imaging reconstruction problems.
no code implementations • 12 May 2020 • Gregory Ongie, Ajil Jalal, Christopher A. Metzler, Richard G. Baraniuk, Alexandros G. Dimakis, Rebecca Willett
Recent work in machine learning shows that deep neural networks can be used to solve a wide variety of inverse problems arising in computational imaging.
1 code implementation • 14 Feb 2020 • Christopher A. Metzler, Gordon Wetzstein
This paper introduces and solves the simultaneous source separation and phase retrieval (S$^3$PR) problem.
no code implementations • 13 Dec 2019 • Christopher A. Metzler, David B. Lindell, Gordon Wetzstein
Non-line-of-sight (NLOS) imaging and tracking is an emerging technology that allows the shape or position of objects around corners or behind diffusers to be recovered from transient, time-of-flight measurements.
no code implementations • CVPR 2020 • Christopher A. Metzler, Hayato Ikoma, Yifan Peng, Gordon Wetzstein
High-dynamic-range (HDR) imaging is crucial for many computer graphics and vision applications.
1 code implementation • 26 May 2018 • Christopher A. Metzler, Ali Mousavi, Reinhard Heckel, Richard G. Baraniuk
We show that, in the context of image recovery, SURE and its generalizations can be used to train convolutional neural networks (CNNs) for a range of image denoising and recovery problems without any ground truth data.
2 code implementations • ICML 2018 • Christopher A. Metzler, Philip Schniter, Ashok Veeraraghavan, Richard G. Baraniuk
Phase retrieval algorithms have become an important component in many modern computational imaging systems.
1 code implementation • NeurIPS 2017 • Christopher A. Metzler, Ali Mousavi, Richard G. Baraniuk
The LDAMP network is easy to train, can be applied to a variety of different measurement matrices, and comes with a state-evolution heuristic that accurately predicts its performance.
2 code implementations • 16 Jun 2014 • Christopher A. Metzler, Arian Maleki, Richard G. Baraniuk
A key element in D-AMP is the use of an appropriate Onsager correction term in its iterations, which coerces the signal perturbation at each iteration to be very close to the white Gaussian noise that denoisers are typically designed to remove.