1. A method for tracking a person, comprising: receiving a depth image that includes a target, the target corresponding to a person and comprising a head portion, a torso portion, arms portions, and legs portion; generating voxels from the depth image, each voxel comprising an x-value, a y-value, and a depth value; identifying a first plurality of voxels corresponding to the target; calculating an average x-value, an average y-value, and an average depth value from the plurality of voxels corresponding to the target; identifying a centroid of the target, the centroid having the average x-value, the average y-value, and the average depth value; searching from the centroid and toward a head portion of the target for a first voxel that is not associated with the target; searching from the centroid and away from the head portion of the target for a second voxel that is not associated with the target; and determining a core volume of the target, the core volume based at least in part on the first voxel and the second voxel and excluding at least part of the legs portion of the target.