Search Results for author: Christopher A. Metzler

Found 22 papers, 9 papers with code

WaveMo: Learning Wavefront Modulations to See Through Scattering

no code implementations11 Apr 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.

Astronomy

Adaptive LPD Radar Waveform Design with Generative Deep Learning

no code implementations18 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.

Radar waveform design

Bagged Deep Image Prior for Recovering Images in the Presence of Speckle Noise

1 code implementation23 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.

Hyper-Diffusion: Estimating Epistemic and Aleatoric Uncertainty with a Single Model

no code implementations5 Feb 2024 Matthew A. Chan, Maria J. Molina, Christopher A. Metzler

In this work we introduce a new approach to ensembling, hyper-diffusion, which allows one to accurately estimate epistemic and aleatoric uncertainty with a single model.

Computed Tomography (CT) Weather Forecasting

AONeuS: A Neural Rendering Framework for Acoustic-Optical Sensor Fusion

no code implementations5 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.

3D Scene Reconstruction Neural Rendering +2

TiDy-PSFs: Computational Imaging with Time-Averaged Dynamic Point-Spread-Functions

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.

Monocular Depth Estimation

SUD$^2$: Supervision by Denoising Diffusion Models for Image Reconstruction

no code implementations16 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.

Image Denoising Image Reconstruction

Weakly-Supervised Semantic Segmentation of Ships Using Thermal Imagery

no code implementations26 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

MetaDIP: Accelerating Deep Image Prior with Meta Learning

no code implementations18 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.

Denoising Meta-Learning +1

Denoising Generalized Expectation-Consistent Approximation for MR Image Recovery

2 code implementations9 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).

Denoising

TurbuGAN: An Adversarial Learning Approach to Spatially-Varying Multiframe Blind Deconvolution with Applications to Imaging Through Turbulence

no code implementations13 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.

Supervision by Denoising for Medical Image Segmentation

no code implementations7 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.

Denoising Image Reconstruction +3

D-VDAMP: Denoising-based Approximate Message Passing for Compressive MRI

1 code implementation25 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.

Denoising Image Reconstruction

Deep Learning Techniques for Inverse Problems in Imaging

no code implementations12 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.

Deep S$^3$PR: Simultaneous Source Separation and Phase Retrieval Using Deep Generative Models

1 code implementation14 Feb 2020 Christopher A. Metzler, Gordon Wetzstein

This paper introduces and solves the simultaneous source separation and phase retrieval (S$^3$PR) problem.

Retrieval

Keyhole Imaging: Non-Line-of-Sight Imaging and Tracking of Moving Objects Along a Single Optical Path

no code implementations13 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.

Autonomous Driving

Unsupervised Learning with Stein's Unbiased Risk Estimator

1 code implementation26 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.

Astronomy Image Denoising

Learned D-AMP: Principled Neural Network based Compressive Image Recovery

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.

Denoising

From Denoising to Compressed Sensing

2 code implementations16 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.

Denoising

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