*2.3. Filtering Steps*

As noted in Figure 1, some of the false positives generated by the ensemble of classifiers are extracted by applying several filtering approaches that take advantage of the depth maps. The filters tested in this work are the set of six tested in [9] (viz. SIZE, STD, SEG, ELL, EYE, and SEC) and a new filter proposed here (viz. WAV), which is based on processing the image with different wavelets. Each of these filtering techniques is described below. Figure 3 illustrates images rejected by the seven types of filters.

**Figure 3.** Examples of images rejected by the different filtering methods.
