Algorithms and Perception for Interactive Free-Viewpoint Image-Based Navigation

Date

July 19, 2013

Speaker

Gaurav Chaurasia

Affiliation

INRIA Sophia Antipolis

Overview

We present IBR approaches that compensate for lack of depth using image-based operations to create free viewpoint walkthroughs. In the first project, we use discontinuous image warping guided by quasi-dense depth maps which gives far fewer IBR artifacts than projective texturing an erroneous 3D model. In the second project, we oversegment the image and warp superpixels independently using sparse depth. We introduce depth synthesis to create approximate depth which can be used within our image warps for creating pleasing walkthroughs. We compare our results to as many as four recent IBR approaches and show that our approach extends very well to free viewpoint navigation.
We also investigate perceptual issues of basic IBR of projecting panoramic images onto a planar proxy, widely used for city visualization. We compare artifacts of smooth transitions (blending multiple images) with abrupt transitions (popping/hatching) from a perceptual point of view and develop guidelines for selecting the best possible tradeoff. In another study, we further zoom into the problem and use vision science to investigate perspective distortions produced when single image projected onto a planar geometry is viewed from novel viewpoints. We use the study to develop capture density guidelines that minimize such distortions.
Overall, we believe that our work is an important step towards principled free-viewpoint interactive image-based navigation

Speakers

Gaurav Chaurasia

Gaurav Chaurasia is a third year PhD student at INRIA Sophia Antipolis, France in the REVES group supervised by Dr. George Drettakis. He received a bachelors degree in computer science from Indian Institute of Technology Delhi, India in 2009. During his undergraduate, he interned at NVIDIA in the embedded graphics team. He completed a Masters degree in computer science at the École Nationale Supérieure d’Informatique et de Mathématiques Appliquées (ENSIMAG), France in 2010 with a major in computer graphics. His main research interests are image warping, image-based rendering, texture synthesis and GPU based image processing.