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October 9th, 1995
D. IEU (IMAGE ENHANCEMENT UNIT)
D.1. OVERVIEW
The IEU processes Photo/Text separation and Binary conversion
automatically.
•
Automatic Photo/Text Separation: To improve image reproduction of
Photo/Text documents, text and photo areas are distinguished
automatically and the appropriate image processing is done on them.
•
Automatic Binary Conversion: To improve image reproduction of text
which is printed in various densities, the density is detected
automatically and the threshold level is adjusted accordingly.
D.2. BLOCK DIAGRAM
Multi-value
DIB
Video Data
Binary Video
BIB
Data
CPU
CIB
Reference
TGB
Clock
The IEU consists of the following 8 blocks.
1. DIB (Video Data Input Block)
The DIB has the following functions: controlling the input of multi-value (8 bit)
video data, generating the line reset signal and the page reset signal, and
transmitting multi-value video data to the GTB.
2. BIB (Binary Video Data Input Block)
The BIB has the following functions: controlling the binary video input data,
adjusting the delay time for each pixel, and transmitting multi-value video
data to the DOB.
IEU (IMAGE ENHANCEMENT UNIT)
FIFO
SRAM
GTB
IPB
D-1
OVERVIEW
ZMB
DOB
G404O500.WMF
IEU Video
Data
+5V
GND
Others
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