Ricoh B022, Service Manual, Page: 581 / 878

SCANNER FUNCTIONS
B453/B461 4-8 SM
4.3 SCANNER FUNCTIONS
4.3.1 IMAGE PROCESSING FOR SCANNER MODE
The image processing for scanner mode is done in the IPU board. The IPU board
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 board does the image processing
using the appropriate image processing methods mentioned above.
Image Data Path
1. Image Store/Image Delivery Mode
The user can select the following modes from the LCD.
1) Delivery only
2) Store only (This feature requires the optional hard disk)
3) Store and delivery (This feature requires the optional hard disk)
When selecting the delivery only mode, after image processing and image
compression using TIFF (binary picture processing) or JPEG (grayscale
processing), the controller creates a file which contains the destination and page
information, then the controller sends the file to a server. The type of TIFF
format used depends on the user’s scanner settings.
When selecting the store only or the store and delivery mode, all images for the
job are stored in the HDD. Then the controller creates a file and (store and
delivery mode only) sends it to a server.
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.
Controller S B U
I m a g e
Scanning
Server
H D D
File
I P U
I m a g e
Processing
I m a g e
C o m p r e s s i o n
N I B
B453D550.WMF
Controller S B U
I m a g e
S c a n n i n g
Image
IPU
I m a g e
P r o c e s s i ng
I m a g e
C o m p r e s s i o n
N I B
P C
B453D551.WMF