1. A method performed by a computer for processing images to identify a head portion of a subject in the images comprising: obtaining images of a subject; generating, by the computer, a first confidence value representing a confidence that a first process has identified a location of a head portion of the subject in the images; generating, by the computer, a second confidence value representing a confidence that a second, different process has identified the location of the head portion of the subject in the images; and identifying, by the computer, the location of the head portion of the subject in the images based at least in part on the first confidence value and the second confidence value.