2.3Optional Circuit Feature
The following option is provided for this scanner: f Image processing circuit ¬ (M3097E0191) For the details, refer to Subsection 2.3.1.
f CMP II (M3097G0196)
2.3.1Image processing circuit ¬ (IPC ¬)
This option has the dynamic threshold function and image processing function.
2.3.1.1Dynamic 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.
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.
(b)Normal mode
This mode is used when using writing materials other than above.
(4)Noise removal
Among black>dots in the binary picture code, the black>dot for the noise is changed to white>dot.
2 $ 4