Document retrieval apparatus retrieving document data using calc

Details Document retrieval apparatus retrieving document data using calc Document retrieval apparatus retrieving document data using calc

1995-02-24

1997-10-21

Black, Thomas G.

Image analysis

Histogram processing

For setting a threshold

395603, 395606, 395612, 395616, 382317, 434178, G06F 1730

Patent

active

056806124

ABSTRACT:
There is provided a document retrieval apparatus in which signatures can be easily extracted from document data, and false drop probability is reduced even for a long document so as to reduce a burden of eliminating the false drop. A processing unit converts the document data and the character string into character codes, respectively. The processing unit extracts signatures from each of the character codes, and calculates a record identifier of the document data to be stored based on a storing position of the document data in a record file. A data storing unit stores the document data to be registered in the record file, and stores the signature corresponding to the document data to be registered in a signature file. The signature is stored in a storing position in the signature file, the storing position being designated by the record identifier of corresponding document data stored in the record file. The processing unit retrieves the document data containing a character string identical to the character string to be searched for by referring to a record identifier calculated based on a storing position of the signature in a signature file.

REFERENCES:
patent: 5444840 (1995-08-01), Froessi
patent: 5452379 (1995-09-01), Poor
patent: 5521991 (1996-05-01), Billings
patent: 5542086 (1996-07-01), Andrew et al.
patent: 5556282 (1996-09-01), Middlebrook
"Access Method of Text" by Christos Faloutsos (Computing Surveys, vol.17, No.1, Mar. 1985, pp. 49-74).
"Partial-Match Retrieval via the Method of Superimposed Codes" by Charles S. Roberts (Proceedings of the IEEE., vol.67, No.12, Dec. 1979, pp. 1624-1642).
"Description and Performance Analysis of Signature File Methods for Office Filing" by Christos Faloutsos (ACM Transaction Office Information Systems, vol.5, No.3, Jul. 1987, pp. 237-257).

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