3维的SIFT算法。源码来自Saad Ali，可去作者的主页寻找http://www.cs.ucf.edu/~pscovann/. 代表论文为Paul Scovanner, Saad Ali, and Mubarak Shah, A 3-Dimensional SIFT Descriptor and its Application to Action Recognition, ACM MM 2007. 使用时先阅读readme.