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SEARCHING A REPOSITORY OF DOCUMENTS USING A SOURCE IMAGE AS A QUERY

  • US 20100185615A1
  • Filed: 01/14/2009
  • Published: 07/22/2010
  • Est. Priority Date: 01/14/2009
  • Status: Active Grant
First Claim
Patent Images

1. A method for searching a repository of documents using an image as a search query, the method comprising:

  • receiving a query image I* to be used to search a repository of documents;

    hashing said query image to obtain a hash value h(I*) for said query image;

    setting an initial threshold level τ

    0 for said search;

    performing a no-reference quality assessment on said query image to estimate of a measure of quality Q(I*) for said query image e;

    adjusting said initial threshold level by said measure of quality, said adjusted threshold defining a possible match for said search;

    for each current document in said repository;

    for each current image in said document;

    extracting said current image I(k) from said current document;

    hashing said extracted current image to obtain a hash value h(I(k) for said extracted current image;

    computing a distance between said hash value h(l*) of said query image and said hash value h(I(k) of said extracted current image;

    comparing said computed distance against said adjusted threshold; and

    flagging said current document as a possible match in response to said computed distance being less than said adjusted threshold; and

    providing any of said flagged documents to a user in response to said search.

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