Overview; Analog Image Processing; Ccd/Ccd Drive Circuit; Ii. Analog Image Processing - Canon GP160DF Service Manual

CHAPTER 4 IMAGE PROCESSING SYSTEM

II. ANALOG IMAGE PROCESSING

A.

Overview

The analog processor PCB converts the CCD drive control and CCD output signals
(analog signals) into digital signals. It also controls the AE.
B.

CCD/CCD drive circuit

The CCD is a linear image sensor with 5000 pixel per line (light receiving unit). The
signal which has undergone photoelectric conversion at the light receiving unit is output
separately as even number pixels and odd number pixels, and is transmitted to the CCD
drive circuit. The CCD drive circuit then synthesizes the separately output odd number
and even number pixel signals, and outputs the synthesized signal to the A-D conver-
sion circuit.
Analog processor PCB
CCD
Odd number
pixel signal
Even number
pixel signal
4-2
Image signal
(analog)
CCD drive circuit
Reference
voltage circuit
Figure 4-201
COPYRIGHT © 1999 CANON INC.
A-D
conversion
circuit
ABC circuit
ABC setting signal
ABC circuit off signal
Analog signal setting signal
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Image signal
(digital)
Clock pulse