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RECORDING SECTION
2.1
Image Area Separation Processing, Smoothing Pro-
cessing and Selector
2.1.1 Image area separation processing
Image area separation processing section looks at the pixels around the
pixel
are part of a binary image or part of an image with half-tones such as a
photo. The following describes "number of isolated pixels" and "number
of black/white reversions" that are used for judgment, and the judgment
criteria.
• Number of isolated pixels
The focus is applied to a certain single pixel, and the total number of iso-
lated pixels in a given matrix centered around that pixel is calculated. For
example, if a certain pixel is white, and the adjacent four pixels are black,
then that pixel is said to be an "isolated pixel."
In Fig. 4-2 a), the number of isolated pixels is two, and in b) the number of
isolated pixels is zero.
4–4
(focus pixel) that is to be smoothed, and judges whether the pixels
a) When there are
isolated pixels
: Focus pixel
: Black pixel
: White pixel
Fig. 4-2 Number of Isolated Pixels
b) When there are
no isolated pixels
isolated
pixels
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