1. A method for identifying a location of a hand of a person, comprising: identifying a group of pixels in an image of a scene as representing the person; defining a plane positioned and oriented based on three-dimensional coordinates of the group of pixels identified as representing the person; setting a reference point for the group of pixels identified as representing the person; identifying a local distance maximum from the reference point within the group of pixels identified as representing the person based on the position and orientation of the plane; and outputting an indication of the location of the hand of the person based on the identified local distance maximum.