Michael Kellman

kellman at eecs dot berkeley dot edu

I am a PhD graduate student at UC Berkeley in the EECS department, where I work on problems in the fields of signal processing, computational imaging, and machine learning. I am advised by Prof. Laura Waller and Prof. Michael Lustig and am funded by NSF GRFP. I am also affiliated with the Berkeley Artificial Intelligence Research Laboratory and the Berkeley Center for Computational Imaging. I am an enthusiast of engineering, science, food, photography, and art.

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Learning LED patterns for Fourier Ptychographic Microscopy

Want to learn the experimental design for your computational imaging system? Checkout our code on github to learn the best LED patterns for Fourier Ptychographic microscopy.


Featured Research

In broadest terms, the goal of my research is to improve the limitation of modern computational imaging systems. I'm particularly interested in the areas of signal processing, machine learning theory, image reconstruction algorithms, and optical modeling. Specifically, my work is focused on the applications of microscopy, medical imaging, and photography. My PhD dissertation topic is data-driven design methods for computational imaging systems.

Memory-efficient Learning for Large-scale Computational Imaging
Michael Kellman, Jon Tamir, Emrah Bostan, Michael Lustig, Laura Waller
Neural Information Processing Systems, 2019.
preprint / bibtex

Critical aspects such as experimental design and image priors should be optimized through the unrolled iterations of classical physics-based reconstructions (termed physics-based networks). For real-world large-scale systems, computing gradients via backpropagation restricts learning due to the memory limitations of graphical processing units. In this work, we propose a memory-efficient learning procedure that exploits the reversibility of the network's layers to enable data-driven design for large-scale computational imaging (e.g. super-resolution optical microscopy and 3D multi-channel magnetic resonance imaging).

Data-Driven Design for Fourier Ptychographic Microscopy
Michael Kellman, Emrah Bostan, Michael Chen, Laura Waller
IEEE International Conference for Computational Photography, 2019.
preprint / poster / bibtex / code

We learn experimental design parameters to perform compressed Fourier Ptychography (i.e. super-resolution imaging) on an LED array microscope. This is accomplished by recasting the Fourier Ptychographic image reconstruction as a Physics-based Neural Network and learning the experimental design to optimize the system's overall performance.







Physics-based Learned Design: Optimized Coded-Illumination for Quantitative Phase Imaging
Michael Kellman, Emrah Bostan, Nicole Repina, Laura Waller
IEEE Transactions on Computational Imaging, 2019.
blog / poster / bibtex

We present a novel data-driven experimental design method to optimize the end-to-end performance of a computational imaging system. By unrolling the iterations of an image reconstruction we build a network that is parameterized by the system's experimental design and that incorporates both the system physics of measurement formation and the non-linearities of the reconstruction. We demonstrate our methodology by learning how best to capture measurements for quantitative phase imaging on the LED array microscope.

Motion-resolved Quantitative Phase Imaging
Michael Kellman, Michael Chen, Zachary Phillips, Michael Lustig, Laura Waller
Biomedical Optics Express (BOEx), 2018.
talk / poster / video / bibtex

The temporal resolution of quantitative phase imaging with Differential Phase Contrast (DPC) is limited by the requirement for multiple illumination-encoded measurements. This inhibits imaging of fast-moving samples. We present a computational approach to model and correct for non-rigid sample motion during the DPC acquisition in order to improve temporal resolution to that of a single-shot method and enable imaging of motion dynamics at the framerate of the sensor.


Node-Pore Coded Coincidence Correction: Coulter Counters, Code Design, and Sparse Deconvolution
Michael Kellman, Francios Rivest, Alina Pechacek, Lydia Sohn, Michael Lustig
IEEE Sensors Journal, 2018.
poster / code / data / bibtex

Using communication theory and detection theory, we create a Barker-coded high-throughput microfluidic channel. We jointly design the channel's system response and cell detection heuristic to efficiently resolve coincidence events by way of an inverse problem formulation.

This work is done in collaboration with the Sohn Lab.

Archive
Apr. 2, 2019

I am working this summer on the computational imaging team at Google AI with Dr.Peyman Milanfar as a research intern.

Physics-Based Learned Design: Teaching a Microscope How to Image
Michael Kellman, Emrah Bostan, Laura Waller
Nov. 26, 2018

Computational imaging systems marry the design of hardware and image reconstruction. For example, in optical microscopy, tomographic, super-resolution, and phase imaging systems can be constructed from simple hardware modifications to a commercial microscope and computational reconstruction. Traditionally, we require a large number of measurements to recover the above quantities; however, for live cell imaging applications, we are limited in the number of measurements we can acquire due to motion. Naturally, we want to know what are the best measurements to acquire. In this post, we highlight our latest work that learns the experiment design for a non-linear computational imaging system.


Teaching

EE16A - Fall 2019 (content GSI)

EE16A - Fall 2018 (discussion and content GSI)


Copyright 2019 Michael Kellman. All rights reserved.
Template borrowed from Jon Barron.

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