Content Based image retrieval (CBIR),which is the mixture of image understanding and multimedia, is becoming a key technique in next generation large scale intelligent multimedia database.

• 0引言信息时代的到来使得人们越来越多地接触到大量的图象信息，有效地组织、管理和检索大规模的图象数据库成为迫切需要解决的问题。