1. A system to generate a signature associated with a video program, the system comprising: an intra-coded block extractor to extract intra-coded macro blocks from a video frame associated with the video program; a scaled image extractor to extract a scaled image from the intra-coded macro blocks; and a signature generator to form a signature for the scaled image based on a first centroid associated with a first image component of the scaled image and a second centroid associated with a second image component of the scaled image, the first centroid defined by first coordinates within the scaled image and the second centroid defined by second coordinates relative to the first centroid coordinates.