Method and apparatus for retrieving text using document signatures
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United States of America Patent
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Nov 16, 2004
Issued Date -
N/A
app pub date -
Jan 18, 2000
filing date -
Jul 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for retrieving similar or identical textual passages among different documents is disclosed. Normal discourse structures along with textual content attributes are used to encode a known passage with 'marker sequences' that give a characterizing 'signature' to the passage. The encoded known passage is then evaluated against similarly encoded passages appearing in a database of documents. If it is determined that there is a possible match between the encoded known passage and an encoded passage in a database document, a sequential string search is performed to determine whether the two passages are likely to be similar or identical. If the sequential string search records a probable match between the known passage and the database passage, the database passage is displayed for further review.
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