1. A method, comprising: receiving from a depth camera a series of depth maps imaging a scene including a human subject, each depth map including a plurality of pixels, each of the plurality of pixels defining a depth of a surface imaged by that pixel; modeling the human subject with a virtual skeleton including a plurality of virtual joints including a virtual hand joint and one or more other virtual joints; mapping a position of the virtual hand joint to a corresponding portion of one or more depth maps in the series of depth maps, the corresponding portion of the one or more depth maps imaging a hand of the human subject modeled by the virtual hand joint and excluding other portions of the human subject modeled by the one or more other virtual joints; performing analysis on depth map information of the corresponding portion of one or more depth maps to model one or more fingers of the hand without performing analysis on depth map information of other portions of the one or more depth maps corresponding to the other portions of the human subject modeled by the one or more other virtual joints; and interpreting a finger gesture performed by the one or more fingers.