Canon Canoscan CS8000F Service Manual download pdf (Page 31)

CHAPTER 2

2 - 15

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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

BCD(A+B)/2 (B+C)/2 (C+D)/2

Interpolation processing

Image

Density

1 pixel

Image

Density

1 pixel

Interpolation processing

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Canon Canoscan CS8000F Service Manual Page 31