1. A method of generating index elements of objects in images captured by a camera system, the method comprising: capturing a first group of multiple images of an object in a field of view of the camera system; detecting the object in the first group of multiple images; generating a first set of single-frame signatures of the object, the single-frame signatures of the first set corresponding to features of the object derived from the multiple images of the first group; producing a first average signature of the object, the first average signature being an average of the single-frame signatures of the first set, and the first average signature being a first index element of the object; producing a cumulative signature of the object, the cumulative signature being a weighted average of the single-frame signatures of the first set; capturing a second image of the object; detecting the object in the second image; generating a second single-frame signature derived from the second image; updating the cumulative signature by weighing the second single-frame signature and averaging the weighted second single-frame signature with the cumulative signature; and determining whether to accept or reject the updated cumulative signature and the first average signature as a match, wherein the first average signature is updated based on the second single-frame signature when the updated cumulative signature and the first average signature are accepted as a match, and a second average signature of the object is produced based on the second single-frame signature when the updated cumulative signature and the first average signature are rejected as a match, the second average signature being a second index element of the object.