Image processing apparatus and method and medium
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United States of America Patent
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May 14, 2002
Grant Date -
Dec 20, 2001
app pub date -
Feb 12, 1997
filing date -
Feb 15, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There are provided an image processing apparatus and method which can properly determine the number of quantization levels for quantizing image data by properly removing noise from the background of the image data. A histogram forming unit forms the output frequency distribution of densities of image data. A background density width detecting unit determines a density area exhibiting output frequency values equal to or larger than a predetermined threshold and including a maximum output frequency value in the formed distribution. A quantization level count determining unit decides the number of quantization levels on the basis of the number of maximum values included in the distribution other than the determined density area.
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