B622 12 SM
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).
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
The user can select the following modes from the LCD.
1) Delivery only
After image processing and image compression, all image data for the job are
stored in the printer controller RAM using TIFF file or PDF file format (binary
picture processing). The type of TIFF or PDF 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.
2. Twain Mode
After image processing and image compression, the data (TIFF or PDF) is sent
to the scanner Twain driver directory on the computer.
ControllerSBU
Image
Scanning
Server
File
BICU
Image
Processing
Image
Compression
Network
I/F
RAM
B622D902.WMF
ControllerSBU
Image
Scanning
Image
BICU
Image
Processing
Image
Compression
Network
I/F
PC
B622D903.WMF
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