Scanner Functions; Image Processing For Scanner Mode - Gestetner B003 Service Manual

4.3 SCANNER FUNCTIONS

4.3.1 IMAGE PROCESSING FOR SCANNER MODE

The image processing for scanner mode is done in the IPU chip on the BICU
board. The IPU chip chooses the most suitable image processing methods
(gamma tables, dither patterns, etc) depending on the settings made in the driver.
The image compression method can be selected with SP mode (MR/MH/MMR for
binary picture processing, JPEG for grayscale processing).
Whether the user selects the image mode using the driver (TWAIN mode) or from
the operation panel (Delivery mode), the IPU chip does the image processing using
the appropriate image processing methods mentioned above.
Image Data Path
1. Image Store/Image Delivery Mode
I m a g e
Scanning Processing
S B U
The user can select the following modes from the LCD.
1) Delivery only
2) Store only
3) Store and delivery
After image processing and image compression, all image data for the job are
stored in the printer controller HDD using TIFF file format (binary picture
processing) or JPEG file format (grayscale processing). The type of TIFF format
used depends on the user's scanner settings.
When delivery mode is selected, the controller creates a file which contains the
destination and page information, then the controller sends the file to a server.
I m a g e
Scanning
S B U
2. Twain Mode
After image processing and image compression, the data (TIFF or JPEG) is sent
to the scanner Twain driver directory on the computer.
SM
I m a g e I m a g e
Compression
B I C U
I m a g e I m a g e
Processing C o m p r e s s i o n
B I C U
4-7
SCANNER FUNCTIONS
File
N I B
H D D
Controller
Image
NIB
Controller
B003/B004/B006/B007
S e r v e r
B361D500.WMF
P C
B361D501.WMF