80(3); U f--+ U, 5In some literature, the matrix it is denoted by u x or [ul x. 6We will explain the reason for this name later in this chapter. 2. 2 30(3) ~ JR3 ; u t--* UV = u. Rigid-body motion Consider an object moving in front of a camera. In order to describe its motion one should, in principle, specify the trajectory of every single point on the object, for instance, by specifying coordinates of a point as a function of time X (t).
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