Toshiba e-studio 250 - Image Processing Circuit

e-STUDIO160/200/250 IMAGE PROCESSING 6 - 2 December 2002 TOSHIBA TEC
Fig. 6-2-1
07002
CCD board
CCD
A/D conversion
SLG board
Image processing
section
Shading correction
High quality image processing,
image memory editing, editing
processing, gamma correction,
tone processing, and external
output systems interface.
MAIN board
Laser unit
Laser drive
: Image data flow
External input systems interface
Image area control
Laser related control
ASIC [ST.LOUIS]
ASIC [PTC]
Smoothing processing
ASIC [EET]
Page memory
Memory copy, vertical/horizontal
alternate copy, sort copy, group
copy, magazine copy, simplex
reduction concatenation, duplex
reduction concatenation, image
combination, date annotation,
sheet insertion mode, etc.
6.2 Image Processing Circuit
(1) Outline
This digital copier optically scans the original placed on the original glass and reads the original
image using the CCD (charge coupled device), and converts the image into electrical signals. The
electrical signals are A/D converted into digital signals and input to the image processing section
where shading correction (compensation for variance in the CCD or the light source) and various
image-processing operations are performed. The results are output to the printer.
(2) Image Processing Circuit on the SLG Board
The SLG board contains an image processing ASIC which implements the following functions.
<Functions>
High quality image processing, image memory editing, editing processing, gamma correction pro-
cessing, tone processing and external output system interface