Dotted image area detecting apparatus and dotted image area detecting method
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United States of America Patent
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Apr 11, 2000
Issued Date -
N/A
app pub date -
Mar 2, 1998
filing date -
Nov 16, 1994
priority date (Note) -
Expired
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Abstract
An apparatus for and a method of reliably detecting a very small dotted image area. A detecting area including a predetermined number of pixels including a target pixel is set. It is judged whether or not the detecting area belongs to a dotted image area on the basis of the number of edge pixels in the detecting area. Consequently, it is possible to detect edges peculiar to the dotted image area on the basis of a leading edge portion or a trailing edge portion of the density, to detect the very small dotted image area on the basis of the number of edge pixels.
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