Temporal Factorization Vs. Spatial Factorization

L. Zelnik-Manor and M. Irani


The traditional subspace-based approaches to segmentation (often referred to as multi-body factorization approaches) provide spatial clustering/segmentation by grouping together¬† points with consistent motions. We are exploring a dual approach to factorization, i.e., obtaining temporal clustering/segmentation by grouping together frames capturing consistent shapes. cuts are thus detected at non-rigid changes in the shape of the scene/object. In addition it provides a clustering of the frames with consistent shape (but not necessarily same motion). For example, in a sequence showing a face which appears serious at some frames, and is smiling in other frames, all the “serious expression” frames will be grouped together and separated from all the “smile” frames which will be classified as a second group, even though the head may meanwhile undergo various random motions.ECCV’04 Paper in pdf

Full length version (submitted to review)

Some example results:
These videos show results of temporal clustering of frames. Frames are labeled according to recovered temporal clusters.
Single sequence:

Brave Heart (1.1M avi)

Across sequences: