Ipu (Image Processing Unit) - Ricoh IS450S Service Manual

IMAGE PROCESSING

2.4.3 IPU (IMAGE PROCESSING UNIT)

Overview
Analog
C
Processing A D
IC 1
C
Analog
Processing A D
D
IC 2
S B U
The image data from the SBU goes to the IPU IC on the SCU board, which carries
out the following processes on the image data.
1. Auto shading
2. Magnification
3. Mirror processing
4. Filtering (MTF and smoothing)
5. γ (gamma) correction
6. Grayscale processing
7. Binary picture processing
8. Error diffusion
9. Dithering
10. White/black conversion
The image data then goes to the memory controller IC.
O d d
8
IPU
E v e n
8
8
S C U
Opional
IPU
IPU
M e m o r y
Selector
Controller
8
2-18
22 December 1998
S C S I S C S I
8
G411D505.WMF