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2 1 Introduction

(a) (b)

(c) (d)

Figure 1.2 Some examples of computer vision algorithms and applications. (a) Structure from motion algorithms
can reconstruct a sparse 3D point model of a large complex scene from hundreds of partially overlapping pho-
tographs (Snavely, Seitz, and Szeliski 2006) c 2006 ACM. (b) Stereo matching algorithms can build a detailed 3D
model of a building fac¸ade from hundreds of differently exposed photographs taken from the Internet (Goesele,
Snavely, Curless et al. 2007) c 2007 IEEE. (c) Person tracking algorithms can track a person walking in front
of a cluttered background (Sidenbladh, Black, and Fleet 2000) c 2000 Springer. (d) Face detection algorithms,
coupled with color-based clothing and hair detection algorithms, can locate and recognize the individuals in this
image (Sivic, Zitnick, and Szeliski 2006) c 2006 Springer.