Slg Board; Features; Functions Of Image Processing Circuit - Toshiba e-STUDIO200L Service Manual

7.3

SLG Board

7.3.1

Features

1) The image processing section on the SLG board is controlled by the CPU on the SLG board.
2) The image processing section on the SLG board realizes the following when functioning the equip-
ment:
- High quality image processing
- Image memory editing
- Editing processing
- Gamma correction
- Gradation processing
- External output system interface
7.3.2

Functions of image processing circuit

The image processing section mounted on the SLG board realizes the followings:
1) High quality image processing
- Background processing function (Range correction)
This function removes undesirable background so that the original can be reproduced appropri-
ately. By using the background adjustment function while manually adjusting the image density,
undesirable background of the original can be removed if any, and some necessary but disap-
peared background can be recovered. By using this function, it is possible to cut the background
density down to zero when copying originals which have a certain level of background density,
such as newspapers.
<Example>
Dynamic range
Back-
ground
Lower
e-STUDIO200L/202L/203L/230/232/233/280/282/283
IMAGE PROCESSING
After range
width
adjustment
Text
Density Higher
Histogram
Fig. 7-4
Extended dynamic range
Lower
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7 - 4
05/11
width
Density Higher