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1) Interpolation Processing
When scanning at higher resolution, the image quality tends to be reduced. This is because
one pixel output from the CCD is treated as two image data in the horizontal scanning
direction, and one line output of the CCD is treated as two image data in the vertical
scanning direction. The interpolation processing is performed to prevent the image quality
reduction. Figure 2-15 shows a change in image density by the interpolation processing.
A
A
Image
Density
Image
Density
COPYRIGHT 2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
(A)
B
(B)
(A+B)/2
B
(B+C)/2
1 pixel
1 pixel
Figure 2-15
C
(C)
D
Interpolation processing
C
(C+D)/2
D
Interpolation processing
CHAPTER 2
2 - 15
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