Compressing and restoring method of image data based on dot areas and positions
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United States of America Patent
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Oct 9, 2007
Grant Date -
Dec 5, 2002
app pub date -
Dec 20, 2000
filing date -
Dec 20, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for compressing/restoring image data free from degradation of image quality caused by compression/decompression, a method for compressing image data at high compression ratio, and its restoring method are disclosed. In the image data compressing method, image elements contained in a digital image read from a sheet of paper are extracted (S02), each of the extracted image elements (51-53) is subjected to data compression by a compression method corresponding to the type of the image element (S03-S05), and the compressed image element data (54-56) are stored.
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