Figure 22.

Motion models can be used to limit the search area for linking algorithms.³¹¹ (a) The two parabolas represent the past and future volumes in which a particle localized at their intersection may be found on the basis of a motion model. Limiting the search volume reduces the computational cost of the method. (b) Once a trajectory segment has been determined, it is possible to use different motion models in different spatiotemporal areas of the trajectory, as shown by the different shapes of the paraboloid search regions. In this case motion in the later end of the trajectory (designated “head”) is considerably more constrained than motion in the early part of the trajectory (designated “tail”). Reproduced with permission from ref 311. Copyright 2005, IEEE Computer Society.