FEATURE EXTRACTION METHOD, AND IMAGE RECOGNITION METHOD AND FEATURE DATABASE CREATION METHOD USING THE SAME

摘要

A feature extraction method includes: the step (#14) of grouping a cluster of features, in which an interval of the respective features is less than or equal to a predetermined grouping interval, to form a feature group, for a plurality of features of which feature information including at least information of a position and a feature type is included in a predetermined feature information storage unit; the step (#15) of excluding the feature, not suitable for use in an image recognition process of the feature with respect to image information, from the cluster of the features within the feature group; and the step (#18) of extracting a part or all of one or more of the features within the feature group remaining as a result of the exclusion step as a target feature suitable for the use in the image recognition process.