1. A classification method comprising: accessing an image to be analyzed for the presence of a predefined object; processing the 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 image comprising the object; accumulating the scores from the evaluation stages to provide a cumulative score; and using the cumulative score, determining whether the candidate region comprises the object.