“…We classified the appearance models according to simplified human models or complex models. There are simple person models that define the person as a region or shape, i.e., holistic models [2]- [10], [14], [15], [17]- [20], [23]- [38], [42] and more complex models that define the person as combination of multiple regions or shapes, i.e., part-based models [11]- [13], [21], [22], [25], [39]- [41], [43], [44]. Although the vast majority of approaches are mainly based on appearance information, there are some approaches that combine appearance and motion information in order to improve the detection results.…”