The process of generating the cascade of classifiers is
relatively time-consuming, but it produces quite promising
results. The first three stages of a learned cascade are shown in
Fig. . The time performance of the object detection
crucially depends on the bootstrapping, i.e., on the generation
of false positive examples during the stage
learning. Nevertheless, learning has to be executed only once,
the application of the cascade if very fast (300 ms). Thus the
major time for the accurate object localization is spent during
the model alignment and evaluation step (
1.4 s).
The capabilities of the chosen approach have been evaluated in
various experiments. Fig. shows four examples of
successful detections and Table
summarizes
the object localization results.