Method of processing data by performing a predetermined operation between a current and preceding raster and compressing the resultant data
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United States of America Patent
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-
Jul 11, 2000
Grant Date -
N/A
app pub date -
Dec 23, 1992
filing date -
Dec 27, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
At a data output apparatus side, raster image information, which is obtained by means of performing an exclusive OR operation between raster image information on the preceding line and raster image information on the current line, is compression-processed in a raster direction and then transmitted to a data processing apparatus. In the data processing apparatus, the received image information is expansion-processed, an exclusive OR operation between image information after the expansion and image information on the preceding line is carried out, and a processing for recording and the like is performed taking the thus obtained information as the raster image information on the current line. Thus it is possible to provide a higher compression rate of the image information with a simple processing and to improve a processing speed.
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