Canon DR-2580C Service Manual page 52

CHAPTER 2 FUNCTION & OPERATION
8) Black Border Removal
When the black border removal is se-
lected, the image data is read with the
specified read size.
The frame of document is detected based
on this image data and the outside of the
frame is converted into the white data.
(Figure 2-520)
2-26
Specifed size
ABC
Figure 2-520
Figure 2-521
COPYRIGHT © 2005 CANON ELECTRONICS INC.
The conventional black border removal
may vanish the letters if there are some
letters on the edge of document and the
document is skewed to much. This ma-
chine extracts the outer shape of docu-
ment without dent after extracting the
frame. Thus, no letters vanish. (Figure
2-521)
ABC
Outer shape
is extracted
Outside
turns white
CANON DR-2580C FIRST EDITION APR. 2005
Tangent line
is processed