Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-01-03
1990-05-01
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358455, 375 27, H04N 141, H04N 713
Patent
active
049223402
ABSTRACT:
A method and an apparatus of compressing information content of multilevel digital image data having multilevel gradation value P (i, j) of each picture cell comprising means to determine an occurence frequency of individual gradation value from each gradation value P (i, j) in a predetermined image unit or to determine a difference value f(i, j) between gradation values of adjacent picture cells from multilevel image data of a predetermined image component as well as determining an occurrence frequency of individual difference values from the determined difference values f(i, j) in the image and means to code each multilevel gradation value P (i, j) or difference value f(i, j) by assigning a code having a lower bit number as the gradation or difference value has a higher occurrence frequency.
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Britton Howard W.
Nippon Board Computer Co., Ltd.
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