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. Author manuscript; available in PMC: 2010 Dec 22.
Published in final edited form as: IEEE Trans Pattern Anal Mach Intell. 1999 Oct;21(10):974. doi: 10.1109/34.799905

Fig. 4.

Fig. 4

First four principal components of the difference images for the (a) upper face actions and (b) lower face actions. Components are ordered left to right, top to bottom.