Coding method and apparatus
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United States of America Patent
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Nov 29, 1988
Grant Date -
N/A
app pub date -
Oct 28, 1986
filing date -
Oct 28, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coding method includes the steps of dividing an image into a plurality of blocks each consisting of a plurality of picture elements, dividing gray scale information of each intrablock picture element into three components, i.e, (1) a reference level representing a position of a signal level of an intrablock picture element in a whole dynamic range of gray scale representation, (2) a level difference representing a distribution range of the signal levels of the intrablock picture elements, and (3) a level designating signal representing a level of each intrablock picture element within the distribution range, and independently coding the three components.
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