1. A method comprising: at a computer, accessing a digital image representing a plurality of faces including a first face and a second face, wherein the digital image is part of a frame of video data; at the computer, identifying a plurality of identification regions of the digital image including a first identification region associated with the first face and a second identification region associated with the second face; at the computer, assigning the digital image to a first face cluster of a plurality of face clusters when a difference between data descriptive of the first identification region and data descriptive of a face cluster identification region of the first face cluster satisfies a threshold; and at the computer, assigning the digital image to a second face cluster of the plurality of face clusters based on an analysis of a portion of the video data to determine a frequency at which the first face and the second face appear together.