COPYRIGHT © CANON ELECTRONICS INC. 2018 CANON DR-G2140/G2110/G2090 FIRST EDITION
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CHAPTER 2 FUNCTION & OPERATION
Analog signals proportionate to the den-
sity of each picture element are output as 9
parallel lines from the image sensor on the
CIS PCB to the analog processor. The analog
processor carries out offset adjustment, gain
adjustment, and A/D conversion. Analog sig-
nals are converted into digital signals in the
analog processor.
This image data is sent to the scanner
controller on the control PCB where data re-
ordering, shading correction, one-dimen-
sional gamma correction, resolution conver-
sion, and various image processing are per-
formed, JPEG compressed data is output to
the computer via the USB interface.
Inside the computer, the various image
processing is executed according to the use
settings by the driver for this machine.
In image processing done by scanner
controller, depending on the reading setting,
some of them are processed by driver.
4. New Binarizing
A new binarizing mode “Active Threshold”
was added. In the past, binarizing mode, the ATE
(Advanced Text Enhancement) or ATE II have
been used for scanning the documents with light
color text and non-uniform or uniformed back-
ground.
The Active Threshold is intended for batch
processing various kind of documents at once,
such as those with light color text or stains. For
examples, users can batch process documents
such as copy slip at once. Brightness-related
properties are automatically adjusted based on
the text and background of the whole image, en-
abling consistent reproduction of light color text
and removal of background stains.
Original Image
Scanned Image
Figure 2-404