Image processing system for compressing image data including binary image data and continuous tone image data by a sub-band transform method with a high-compression rate
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United States of America Patent
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Oct 1, 2002
Grant Date -
Nov 22, 2001
app pub date -
May 7, 1998
filing date -
May 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An image processing system which compresses an image including both a binary image and a continuous tone image by a sub-band transform method with a high compression rate. A 2.times.2 pixel matrix block is extracted from image data. A transform factor having a plurality of frequency components is obtained from the 2.times.2 pixel matrix block data. The transform factor is quantized by a fixed-length quantizing method by deleting a predetermined number of lower order bits of each of the frequency components.
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