Canon Canoscan CS8000F Service Manual download pdf (Page 32)

CHAPTER 2

2 - 16

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2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)

2) Averaging

When reading images at lower resolution, the thinned data increases resulting in output

image deterioration. Averaging is a process in which the data to be thinned and the data to be

actually output are averaged and output, in order to suppress the image deterioration due to

the data thinning.

Figure 2-16

ABCD

EFGH

ABCD

EFGH

A

BCD

EFGH

A'

E'

CCD

reading

data

Output

image

data

Thinned data

CCD

reading

data

Output

image

data

Averaged data=(A+B+C+D)/4

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