Canon fax basic 2000 서비스 매뉴얼

RECORDING SECTION

4–4

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

 (focus pixel) that is to be smoothed, and judges whether the pixels

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.”

Fig. 4-2   Number of Isolated Pixels

In Fig. 4-2 a), the number of isolated pixels is two, and in b) the number of

isolated pixels is zero.

: Focus pixel

: Black pixel

: White pixel

isolated
pixels

a) When there are

isolated pixels

b) When there are

no isolated pixels