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• Number of black/white reversions
The focus is applied to a certain single pixel, and the total number of black/
white reversions in a given matrix centered around that pixel is calculated.
If the adjacent pixels are black and white, then it is said that black/white
reversion is occurring.
Fig. 4-3 Number of Black/White Reversions
In Fig. 4-3, the number of black/white reversions (number of arrows) is 16
when the focus pixel is black.
• Judgment criteria
The image is judged to be a binary image or an image containing half-
tones when the following condition is satisfied.
Binary image: When the number of isolated pixels is the stipulated number
or less, and the number of black/white reversions is the stipulated number
or less
Image containing half-tones: When the number of isolated pixels is the
stipulated number or more, or the number of black/white reversions is the
stipulated number or more
RECORDING SECTION
: Focus pixel
: Black pixel
: White pixel
4–5
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2
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