Method and apparatus for adaptive compression of scanned documents
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United States of America Patent
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Feb 8, 2005
Grant Date -
Nov 14, 2002
app pub date -
Mar 28, 2001
filing date -
Mar 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of compressing a document, includes preparing an encoded representation of a document by scanning the document to provide a scanner output; classifying the scanner output as belonging to a class of document taken from the document classes consisting of smooth, text, graphics and image; and adaptively compressing the scanner output as a function of the class of the document. A compression apparatus for compressing scanned data, includes a scanner for scanning a document and generating a scanner output; a block-based classifier for classifying the scanner output as belonging to a class of documents taken from the document classes consisting of smooth, text, graphics and image; an adaptive compressor for compressing the scanner output according to a compression mode as a function of the class of document; a storage mechanism for storing compressed scanner output and compression mode information; and a decompressor for decompressing compressed scanner output in accordance with the compression mode information.
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