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IEU (IMAGE ENHANCEMENT UNIT)
October 9th, 1995
BLOCK DIAGRAM
3. GTB (Gamma Translation Block)
The GTB does the following: gamma conversion using an internal 256 byte
SRAM, grayscale conversion of multi-value video data (8-bit to 6-bit), and
transmission of multi-value video data to the IPB.
4. IPB (Image Processing Block)
The IPB has the following functions: MTF correction, averaging of input data,
edge extraction, gray level separation, determination of photo and text areas,
automatic binary processing, operation for erasure of single black dots,
unevenness correction, interfacing with the FIFO memory, and transmission
of data to the ZMB.
5. ZMB (Zooming & Mirroring Block)
The ZMB has the following functions: changing magnification, mirroring
images, interfacing with SRAM, and data transmission to the DOB.
6. DOB (Video Data Output Block)
The DOB has the following functions: generating text/photo separation data,
black/white image inversion, serial/parallel conversion, MSB/LSB reversal,
and video data transmission.
7. CIB (CPU Interfacing Block)
The CIB interfaces with the CPU and controls register use by other blocks.
8. TGB (Timing Generator Block)
The TGB generates all timing signals for all blocks.
D-2
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