| 摘要 |
For providing an efficient image pattern matching system, an image feature extractor of the invention comprises a feature vector extraction mea ns for extracting a feature vector from the pattern image, a quality index extracti on means for extracting quality index information of the pattern image, an erro r distribution information storing means wherein error distribution informatio n representing correlation between error distribution of the feature vector an d the quality index information is prepared, and a confidence attribution means fo r obtaining confidence estimation information referring to the error distribution information retrieved with the quality index information. The image feature analyzer prepares the error distribution information. An image feature matching system collates feature information of an image pattern extracted by the ima ge feature extractor by comparing it to registered feature information.
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