Grey value correction method for binary image data
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United States of America Patent
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Apr 26, 2011
Grant Date -
Dec 9, 2004
app pub date -
Mar 24, 2004
filing date -
Jun 6, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of gray value correction for binary image data, preferably screened image data, with a local gray value by a desired correction magnitude includes filtering the image data quantized with n bits with an asymmetrical low-pass filter whose filter window is smaller than a screen cell. By a threshold value operation, corrected binary image data is obtained from the filtered image data. Optimum threshold values are selected from a threshold value table as a function of the local gray value and of the desired correction magnitude.
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