Hwang HW89

Original reference: [7].
Additional assumptions: A speed limit is given. No exit.
Initialization: Within the speed limit, all links between $F_{1}$ and $F_{2}$ are considered.
Cost function: As in SJ87 (eq. (1)), but with different weights $w_{1}=0.4$, $w_{2}=0.6$. The cost is averaged in 3 consecutive frames.
Linking strategy: Multiple extensions of a trajectory are ranked according to their costs. A few top-ranked are kept for final selection in the last frame. Multiple solutions are possible. A point can be assigned no trajectory at all.
Occlusion handling: An occluded point is indicated if a vicinity of the predicted location is empty. The vicinity is defined by the speed limit.