Keir Mierle
427844c28d
Before the refinement phase of tracking, a brute force SAD search is run across the search area. This works well but is slow; especially if the guess for the track's location is accurate. This patch runs a refinement phase before running a brute force search, hoping that the guessed position (in x2, y2) is close to the best answer. If it is, then no brute search is done. If it is not, then a normal brute force search followed by refinement is done. In some cases this may produce worse tracks than before; the regressions will need investigation. The predictive motion model (to be implemented) will reduce the probability of that happening.