1. A computer-implemented head position estimating method comprising: cropping an image object in an image, wherein the image object comprises a visual representation of a head of at least one individual; abstracting one or more features from the image object; and determining a position of the head of the at least one individual in the image object, by way of a processor, using the one or more abstracted features and a predefined statistical model, wherein the determining the position of the head comprises calculating a probability that each of the pixels in the image object belongs to a set of poses of a plurality of sets of poses in the predefined statistical model, and determining the position of the head based on the calculated probability.