Digital Image Processing; Outline - Canon CLC 1120 Service Manual

CHAPTER 4 IMAGE PROCESSING SYSTEM
IV. DIGITAL IMAGE PROCESSING
A. Outline
The copier uses the PCBs shown in Table 4-401 to perform digital image processing, and all
these PCBs are collectively referred to as the "image processor".
The B, G, and R image signals from the analog image processing block are converted into Y,
M, C, and Bk image signals in the digital image processing block.
At the same time, each data unit is converted for image processing selected on the control
panel. At the end of data conversion, the image data is sent to the printer unit in the form of 8-bit
image signals.
PCB
IP MOTHER bus for each IP PCB
(IP motherboard)
IP-MAIN shading correction, 3-line position matching, color
main) correction, original size detection, chromatic space
compression, logarithmic correction, coloring, contouring,
density correction, enlargement/reduction, slanting,
sharpness/filter processing, anti-counterfeit processing,
black character generation (black extraction)
IP-ECO assists the IP-MAIN
IP-ED interface between external devices and copier
editing functions by signals from the editor (color
conversion, texture processing)
IP-IF interface between external devices and copier
IP-PRJ auto focusing in combination with the projector and
shading correction, color correction, mirror processing
when the projector is in use
· In the table, indicates a function available as a standard,
accessory, and a function not available.
· Either an IP-IF PCB or an IP-ED PCB may be installed as an accessory.
4-4
COPYRIGHT © 1999 CANON INC.
Description
Table 4-401
indicates a function available as an
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CLC1150
CLC1120
CLC1130
(IP