2. The apparatus according to claim 1 , wherein the selection unit selects weak classifiers to be composited based on information including a degree of similarity between weak classifiers.
2. The apparatus according to claim 1 , wherein the selection unit selects weak classifiers to be composited based on information including a degree of similarity between weak classifiers. 4. The apparatus according to claim 2 , wherein when filter structures of the weak classifiers are expressed by vectors, the degree of similarity between the weak classifiers is based on at least one of an inner product between the vectors, a Euclidean distance between the vectors, and a Minkowski distance between the vectors.