1. A method for operating an image processing device coupled to a color camera and a depth camera, comprising: receiving a color image of a 3-dimensional scene from a color camera; receiving a depth map of the 3-dimensional scene from a depth camera; generating an aligned 3-dimensional face mesh from a plurality of color images received from the color camera indicating movement of a subject's head within the 3-dimensional scene and from the depth map; determining a head region based on the depth map; segmenting the head region into a plurality of facial sections based on both the color image, depth map, and the aligned 3-dimensional face mesh; and overlaying the plurality of facial sections on the color image.