An impressive example of boosting
	• Viola and Jones created a very fast face detector that can be scanned across a large image to find the faces. • The base classifier just compares the total intensity in two rectangular pieces of the image. – There is a neat trick for computing the total intensity in a rectangle in a few operations. • So its easy to evaluate a huge number of base classifiers and they are very fast at runtime. – We add classifiers greedily based on their quality on the weighted training cases.