CHAPTER 2
2 - 15
COPYRIGHT
2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
1) Interpolation Processing
When reading images at higher resolution, the one pixel output of the CCD is treated as two
image data in the horizontal scanning direction, and the one line output of the CCD is treated
as two image data in the vertical scanning direction, causing a reduced image quality. To
prevent the image quality reduction, interpolation processing is performed. Figure 2-15 shows
a change in image density by the interpolation processing.
Figure 2-15
A
(A)
B
(B)
C
(C)
D
A
B
C
D
(A+B)/2
(B+C)/2
(C+D)/2
Interpolation processing
Image
Density
1 pixel
Image
Density
1 pixel
Interpolation processing