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2.3 Optional Circuit Feature
The following option is provided for this scanner:
f Image processing circuit ¬ (M3097E0191)
For the details, refer to Subsection 2.3.1.
2.3.1 Image processing circuit ¬ (IPC ¬)
This option has the dynamic threshold function and image processing function.
2.3.1.1 Dynamic threshold function
The main purpose of this function is to read handwritten characters.
Handwritten character recognition preprocessing invalues specifying required
values for threshold curve setting, smoothing mode, and filtering mode.
Noise removal reduces noise often found in images after dynamic threshold
processing.
The dynamic threshold circuit is selected when control register #1 bit 4 is set to 1 or
DENSITY is set to AUTO 1 on the operator panel.
Threshold curve setting, smoothing mode, filtering mode, and noise removal are all
dynamic threshold circuit (DTC) functions.
(1) Threshold curve setting
The contrast level of the dynamic threshold circuit can be changed with setting 3
bits (8 levels).
(2) Smoothing mode
The convex portion of the segment is removed and the concave portion is filled up to
smooth the segment.
(3) Filtering mode
(a) Ball>point pen mode
This mode is used when this scanner is used as the input device of OCR system.
When using writing materials caused inter>ommission, e.g. ball>point pen, the
density of the omission portion is increased according to the density of
surrounding portion to get the picture does not have inter>omission.
2 $ 4 50FH5037E>02