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182 4 Feature detection and matching

(a) (b)

(c) (d)

Figure 4.1 A variety of feature detectors and descriptors can be used to analyze, describe and match images: (a)
point-like interest operators (Brown, Szeliski, and Winder 2005) c 2005 IEEE; (b) region-like interest operators
(Matas, Chum, Urban et al. 2004) c 2004 Elsevier; (c) edges (Elder and Goldberg 2001) c 2001 IEEE; (d)
straight lines (Sinha, Steedly, Szeliski et al. 2008) c 2008 ACM.