Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4
IMAGE PROCESSING SYSTEM
In this chapter the unit’s CCD/Analog processor PCB, analog image processing and
digital image processing are summarized.
I. OVERVIEW..............................................4-1
II. ANALOG IMAGE PROCESSING.............4-2
A. Overview ............................................4-2
B. CCD/CCD drive circuit .......................4-2
C. A-D conversion circuit /
ABC circuit .........................................4-3
III. DIGITAL IMAGE PROCESSING..............4-4
A. Overview ............................................4-4
B. Shading correction .............................4-5
C. Magnification ratio process ................4-7
D. Edge emphasis / smoothing
process ..............................................4-7
E. Logarithmic correction........................4-8
F. Half tone density processing..............4-9
G. Binarisation ........................................4-9
IV. DISASSEMBLY, ASSEMBLY ................4-10
A. CCD unit ..........................................4-11
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