For providing an efficient image pattern matching system, an image feature extractor (11) of the invention comprises a feature vector extraction means (101) for extracting a feature vector from the pattern image, a quality index extraction means (106) for extracting quality index information of the pattern...http://www.google.de/patents/US6067369?utm_source=gb-gplus-sharePatent US6067369 - Image feature extractor and an image feature analyzer
