Sunkavalli, KalyanMatusik, WojciechPfister, HanspeterRusinkiewicz, Szymon2011-02-152007Sunkavalli, Kalyan, Wojciech Matusik, Hanspeter Pfister, and Szymon Rusinkiewicz. 2007. Factored time-lapse video. Proceedings International Conference on Computer Graphics and Interactive Techniques, ACM SIGGRAPH 2007 papers: August 05 - 09, 2007, San Diego, California, 101-111. New York, N.Y.: ACM. Also published in ACM Transactions on Graphics 26(3): 101-111.0730-0301http://nrs.harvard.edu/urn-3:HUL.InstRepos:4726186We 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. We show results using several publicly available time-lapse sequences.en-UScomputational photographyimage-based rendering and lightinginverse problemsreflectanceConference Paper2011-02-1510.1145/1276377.1276504