PROBLEM TO BE SOLVED: To extract a feature of an object without separating an object from an image and without a need of a plurality of frame images and model information.;SOLUTION: An object feature extraction apparatus includes a feature extraction unit 210; a feature appearance frequency distribution calculation unit 220; and an object feature extraction unit 230. The feature extraction unit 210 extracts a plurality of feature sets from a plurality of image sets corresponding to a plurality of categories, respectively. The feature appearance frequency distribution calculation unit 220 calculates a plurality of feature appearance frequency distributions on the basis of the plurality of the feature sets, respectively. The object feature extraction unit 230 selects a plurality of important features from a plurality of features on the basis of comparison results of the plurality of the feature appearance frequency distributions, and calculates a plurality of object features indicating a plurality of frequencies where the plurality of the important features appear on the basis of the plurality of the feature appearance frequency distributions and the plurality of the important features.;COPYRIGHT: (C)2011,JPO&INPIT
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