Service manual

CHAPTER 2
2 - 12
COPYRIGHT  2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
III. IMAGE PROCESSING
A. Outline
Image processing system consists of the CCD, analog IC, and ASIC. Analog signal read by the
CCD is converted into digital data, then output to the host computer.
Figure 2-11
B. Image Processing
1. CCD
The CCD is a single chip photoelectric conversion device which consists of several thousand
photosensitive devices of each several microns square, for reading RGB image signals, with a
built-in scanning circuit.
CanoScan 8000F employs 6-line CCD.
1) 6-line CCD
6-line CCD has two rows of staggered photosensitive devices for RGB each. The 6-line CCD
therefore can scan at 1200dpi x 2 = 2400dpi.
Figure 2-12
To Host Computer
1. CCD
2.. A/D
Conversion
3. Calibration
4. Filter
Processing