Greg Humphreys

(University of Virginia, Department of Computer Science, USA)

Our ever-increasing ability to measure and model the physical world has led to the creation of 3D digital models of stunning quality and accuracy. Because these models reflect important cultural heritage as well as countless hours of labor, these environments have become valuable intellectual property. Curators of virtual environments must balance the desire to widely disseminate their models with the need to protect their investment. In this talk, I will describe our ongoing efforts to address this tension with a secure graphics system. In particular, I will present our recent progress on defeating so-called “analog” attacks which reconstruct 3D models from a series of photographs. Although environments rendered using our technique are irrecoverable using state-of-the-art computer vision algorithms, user studies have shown that our technique is imperceptible for both object manipulation and walkthrough environments, affecting neither orientation nor task performance.