1. A classification method comprising: accessing an initial image to be analyzed for the presence of a predefined object; processing the initial image using a plurality of evaluation stages; generating a plurality of scores for respective ones of the evaluation stages responsive to the processing, wherein the scores are indicative of a likelihood of a candidate region of the initial image comprising the object, wherein the generating includes generating an initial score using an initial one of the evaluation stages; using a subsequent one of the evaluation stages, accumulating the scores from the evaluation stages including the initial score to provide a cumulative score; using the cumulative score, determining whether the candidate region comprises the object; accessing an other image to be analyzed; and indicating presence of the object in the other image prior to processing of the other image by at least one of the evaluation stages.