Arts, Media and Engineering Program, Arizona State University, Tempe, AZ;Intelligent Information Management Department, IBM T.J. Watson Research Center, 19 Skyline Drive, Hawthorne, NY;Intelligent Information Management Department, IBM T. J. Watson Research Center, 19 Skyline Drive, Hawthorne, NY;Microsoft Corporation, Microsoft China R&D Group, 49 Zhichun Road, Beijing, NY, China