CONTINUOUS GRADATION COMPRESSION APPARATUS AND METHOD, CONTINUOUS GRADATION EXPANSION APPARATUS AND METHOD, DATA PROCESSING APPARATUS AND ELECTRON DEVICE, AND MEMORY MEDIUM STORING PROGRAMS FOR EXECUTING SAID METHODS
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United States of America Patent
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Sep 21, 2004
Grant Date -
N/A
app pub date -
May 26, 2000
filing date -
Dec 5, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image processing apparatus by which an excellent image can be obtained even after compression and expansion. A compression circuit (12) has a line scanning unit which divides original image data into color data groups in relation to respective pixels, a line compression unit (24) which expresses the value (y) of the color data corresponding to each pixel position in a predetermined section with a polynomial: y=ax.sup.3 +bx.sup.2 +cx+d wherein (x) denotes the pixel position which is a variable and a coefficient calculation unit (26) which obtains the color data values corresponding to the respective pixel positions in accordance with the received coefficients and pixel positions. The restored image data are outputted to a display apparatus, etc.
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