27
Ricoh Co. Ltd.
http://www.ricoh.com/
B245-62 / PD-C4
Slide 27
Image Processing Overview
Data comes to the BICU board from three sources -- scanner, SBU, and printer
controller.
See the notes for more details.
The CCD generates an analog video signal. The SBU (Sensor Board Unit) converts the
analog signal to an 8-bit digital signal, then it sends the digital signal to the BICU board.
The BICU board can be divided into three image-processing blocks: the IPU (Image
Processing Unit), FCI (Fine Character Image), and VCU (Video Control Unit).
IPU: Auto shading, filtering, magnification, scanner gamma correction, ID gamma
correction
VCU: Printer gamma correction, LD print timing control and laser power PWM
control
FCI (inside the VCU): Smoothing
Note: The IPU and VCU are contained in the same IC called SCRATCH on the BICU.
