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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
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| 출원번호 | US-0222281 (1994-04-01) |
| 발명자 / 주소 |
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| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 344 인용 특허 : 0 |
An improved document matching and retrieval system is disclosed where an input document is matched against a database of documents, using a descriptor database which lists descriptors and points to a list of documents containing features from which the descriptor is derived document. The descriptors
An improved document matching and retrieval system is disclosed where an input document is matched against a database of documents, using a descriptor database which lists descriptors and points to a list of documents containing features from which the descriptor is derived document. The descriptors are selected to be invariant to distortions caused by digitizing the documents or differences between the input document and its match in the document database. An array of accumulators is used to accumulate votes for each document in the document database as the descriptor base is scanned, wherein a vote is added to an accumulator for a document if the document is on the list as having a descriptor which is also found in the input document. The document which accumulates the most votes is returned as the matching document, or the documents with more than a threshold number of votes are returned.
An apparatus for matching an input document to a reference document in a document database, comprising: a document database, wherein reference descriptors are derived from content of reference documents in said document database; a descriptor database, identifying, for each reference descriptor, a l
An apparatus for matching an input document to a reference document in a document database, comprising: a document database, wherein reference descriptors are derived from content of reference documents in said document database; a descriptor database, identifying, for each reference descriptor, a list of reference documents which include content from which said each reference descriptor is derived, the descriptor database including, for each reference document, a plurality of redundant reference descriptors for said each reference document, a reference descriptor being redundant in that said each reference document is identifiable from less than all of said plurality of redundant reference descriptors for said each reference document; input means for inputting content of an input document to be matched against said reference documents of said document database; descriptor derivation means, coupled to said input means, for deriving input descriptors from said content of said input document; accumulation means, coupled to said descriptor database and said descriptor derivation means, for accumulating votes for reference documents in said document database by matching said input descriptors with said reference descriptors, said accumulation means accumulating a vote for each reference document in a list of reference documents associated with a particular reference descriptor when the particular reference descriptor matches an input descriptor; and output means, coupled to said accumulation means, for outputting an indication of at least one matching reference document with a count of accumulated votes larger than a threshold count or larger than a count of accumulated votes for a nonmatching reference document.
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