Factored Time-Lapse Video – Hanspeter Pfister – Harvard University: In this talk I will describe a method for converting time-lapse photography captured with outdoor cameras into Factored Time-Lapse Video (FTLV): a video in which time appears to move faster (i.e., lapsing) and where data at each pixel has been factored into shadow, illumination, and reflectance components. The factorization allows a user to easily relight the scene, recover a portion of the scene geometry (normals), and to perform advanced image editing operations.
Our method is easy to implement, robust, and provides a compact representation with good reconstruction characteristics. I will show results using several publicly available time-lapse sequences.
4D Cities: Past, Present, and Future – Frank Dellaert – College of Computing at Georgia Tech: The 4D Cities project at Georgia Tech aims at developing techniques to do spatio-temporal reconstruction of urban environments, with applications in virtual tourism, cultural heritage preservation, urban planning and much more. In this project, we start from images taken over a span of 100-150 years and build a 4D model (3D + time) using conventional structure from motion techniques. I will discuss the recent work we presented at CVPR on recovering the ordering of the images from this reconstruction automatically using constraint satisfaction methods. I will also present other ongoing work and future directions, including an exciting planned collaboration with Microsoft research.