It is today at noon! [Ph.D. Thesis Defense: Chao Liu]

[Artur Dubrawski]

Reminder: Chao's PhD thesis defense is today at noon!

Zoom link and other information can be found below.

Cheers
Artur

---------- Forwarded message ---------
From: Suzanne Lyons Muth <lyonsmuth at cmu.edu>
Date: Tue, Apr 28, 2020 at 10:49 AM
Subject: RI Ph.D. Thesis Defense: Chao Liu
To: ri-people at lists.andrew.cmu.edu <ri-people at lists.andrew.cmu.edu>


Date:  07 May 2020

Time:  12:00 p.m.

Place: *Virtual Presentation* https://cmu.zoom.us/j/2623852919

Type:  Ph.D. Thesis Defense

Who:  Chao Liu

Title:  Vision with Small Baselines


Abstract:
3D sensing with portable imaging systems is becoming more and more popular
in computer vision applications such as autonomous driving, virtual
reality, robotics manipulation and surveillance, due to the decreasing
expense and size of RGB cameras. Despite the compactness and portability of
the small baseline vision systems, it is well-known that the uncertainty in
range finding using multiple views and the sensor baselines are inversely
related. On the other hand, besides compactness, the small baseline vision
system has its unique advantages such as easier correspondence and large
overlapping regions across views.

The goal of this thesis is to develop computational methods and small
baseline imaging systems for 3D sensing of complex scenes in real world
conditions. Our design principle is to physically model the scene
complexities and specifically infer the uncertainties for the images
captured with small baseline setups.

With this design principle, we make four contributions. In the first
contribution, we propose a two-stage near-light photometric stereo method
using a small (6 cm diameter) LED ring. The imaging system is compact
compared to traditional photometric stereo systems. In the second
contribution, we develop an algorithm to simultaneously estimate the
occlusion pattern and depth for thin structures from a focal image stack,
which is obtained either by varying the focus/aperture of the lens or
computed from a one-shot light field image. As the third contribution, we
propose a  learning-based method to estimate per-pixel depth and its
uncertainty continuously from a monocular video stream, with small camera
baselines across adjacent frames. These depth probability volumes are
accumulated over time as more incoming frames are processed sequentially,
which effectively reduces depth uncertainty and improves accuracy,
robustness, and temporal stability. Finally, using a pair of high
resolution camera and laser projector, we develop a high spatial resolution
Diffuse Optical Tomography (DOT) system that can detect accurate boundaries
and relative depth of heterogeneous structures up to a depth of 8mm below a
highly scattering medium such as whole milk.

We showcase the application of a small baseline vision system for in-vivo
micro-scale 3D reconstruction of capillary veins and develop a system for
real-time analysis of microvascular blood flow for critical care. We
believe that the computational methods developed in this thesis would find
more applications of compact 3D sensing under challenging conditions.



Thesis Committee Members:

Srinivasa G. Narasimhan, Co-chair
Artur W. Dubrawski, Co-chair
Aswin C. Sankaranarayanan
Manmohan Chandraker, University of California, San Diego


A copy of the thesis document is available at:

https://www.dropbox.com/s/cz75koh96ragy4x/thesis-small-baseline.pdf?dl=0


_______________________________________________
ri-people mailing list
ri-people at lists.andrew.cmu.edu
https://lists.andrew.cmu.edu/mailman/listinfo/ri-people
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.srv.cs.cmu.edu/pipermail/autonlab-users/attachments/20200507/16a00291/attachment.html>