Functions Of Image Processing Circuit - Toshiba e-STUDIO453 Service Manual

7.3.2 Functions of image processing circuit

The mage processng secton mounted on the SYS board realzes the followngs:
(1) High quality image processing
(a) Background processing function (Rauge correction)
This function removes undesirable background so that the original can be reproduced
appropriately. By using the background adjustment function while manually adjusting the im-
age density, undesirable background of the original can be removed if any, and some neces-
sary but disappeared 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>
Back-
ground
Lower Density Higher
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Dynamic range
After range
width
adjustment
Text
Histogram
Fig. 7-301
7 - 5
Extended dynamic range
width
Lower Density Higher
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IMAGE PROCESSING
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