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24 February, 1999
(4) Gradation Treatment (Dither Processing)
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A259X011.WMF
This machine has two kinds of dither patterns in copier mode.
In Text mode, the dither patterns are made with 1 x 1 dot units, to obtain fine
resolution.
In Photo mode, the dither patterns are made with 2 x 1 dot units. Using the larger
unit, the resolution is less fine, but the output is not sharply focused, which is more
suitable for Photo mode.
Area Editing
In area editing mode, the pre-scanned image (8 bits) is transferred directly to the
operation panel using the VRAM on the main control board. After designating the
area on the display, the area data is sent to the IPU section and the scanned
image is treated in the Area Treatment ASIC in accordance with the area data.
CPU
The CPU (32-bit) controls the image data and the timing in the scanner and IPU
sections.
IPU Board Test
The scanner IPU board contains some LSIs, DRAM, SRAM, and other parts that
control these.
In SP mode, there are test programs to check if the board is defective or not (SP 4-
904-001, 002: 0=OK, other = NG).
SP4-904-001:
Read/write check for each ASIC
SP4-904-002:
Generates patterns from the ASICs, writes them in the field
memory and tests them.
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A259X012.WMF
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IMAGE PROCESSING
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