[Colloquium] Reminder: Joshua Ahn MS Presentation - April 12, 2024

[Jessica Garza]

This is a reminder of Joshua Ahn's MS Presentation

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Candidate: Joshua Ahn

Date: Friday, April 12, 2024

Time:  4 pm CT

Zoom Link: https://uchicago.zoom.us/j/9040721508?pwd=amovMGJDSW83R2JkVC9FMVMydUttQT09

Location: JCL 356

Title: On Alpha Invariance and the Inverse Scaling between Distance and Volume Density in Neural Radiance Fields

Abstract: Scale-ambiguity in 3D scene dimensions leads to magnitude-ambiguity of volumetric densities in neural radiance fields, i.e., the densities halve when the scene size doubles, and vice versa. We call this property alpha invariance. For NeRFs to better maintain alpha invariance, we recommend 1) parameterizing both distance and volumetric density in log space, and 2) using a discretization-agnostic initialization strategy to guarantee high transmittance and consistently high rendering quality. We revisit several popular radiance field models from the literature and find that these architectures use various heuristics to address issues arising from scene scaling. We test their behaviors and demonstrate that our recipe is more robust to changes in scene size.
I will send you a draft of the paper closer to next Friday. Thank you!

Advisors: Greg Shakhnarovich

Committee Members: Greg Shakhnarovich, Rana Hanocka, Michael Maire

Jessica Garza
Assistant Director of Undergraduate Studies
Department of Computer Science
The University of Chicago
John Crerar Library 374
Office: (773) 702-2336




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