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Human image retrieval system

  • US 8,306,281 B2
  • Filed: 10/29/2008
  • Issued: 11/06/2012
  • Est. Priority Date: 11/01/2007
  • Status: Active Grant
First Claim
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1. A human image retrieval system for retrieving an image having a human similar to a human detected from a retrieval query image from a retrieval target image group, comprising:

  • means for inputting said retrieval query image;

    means for detecting a face area from each image of said retrieval target image group;

    means for extracting face image features from each face area detected from said retrieval target image group;

    means for extracting whole image features from a whole area of each image of said retrieval target image group;

    means for detecting a face area from said retrieval query image;

    means for extracting face image features from said retrieval query image;

    means for retrieving a face image similar to a face image in said retrieval query image from said retrieval target image group by using said face image features, and storing n retrieval results in storage means in an order of a higher degree of similarity;

    means for comparing whole image features of a first image, in a query image, having a specific i-th order in said n retrieval results with whole image features of a second image having a lower degree of similarity than a degree of similarity of said first image, to calculate a degree of similarity between said first and second images;

    means for excluding said second image from a set of said retrieval results if a value of said degree of similarity is not lower than a predetermined threshold value;

    means for changing said specific order i←

    i+1, i+2, . . . , n−

    1, and comparing whole image features of an image of a changed specific order with whole image features of an image having a lower order than the changed specific order, to calculate a degree of similarity;

    filtering means for excluding said image having a lower order from a set of said retrieval results if a value of said degree of similarity is not lower than a predetermined threshold value; and

    means for outputting and displaying images left after filtering by said filtering mean.

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