3.3 Optional image function
3-13
IPC-3D:
Dynamic Threshold is identical to the Simplified Dynamic Threshold in IPC mode.
(See section 3.3.2)
NOTICE 1: Threshold, Brightness, and Contrast settings are ignored in DTC mode.
NOTICE 2: Gamma correction is also ignored in DTC mode.
(1)
Pre-filter
The pre-filter performs filtering before processing the Dynamic Threshold. Ordinary and Ball-
point Pen are selectable in Pre-filter.
Table 3.9 Parameter of Pre-filter
Name of
parameter
Control
register No
Value
Effect with IPC-2D
Effect with IPC-3D
Default
Ordinary
B’1xxxxxxx’
Linear gamma curve
High
Contrast
A#3/B#3
B’0xxxxxxx’
Makes low contrast
Image clear (for dark
background
document)
Linear gamma curve
Ordinary
Use Ordinary basically. For the texts written by ball-point pens, use of Ball-point Pen may better
for OCR. This is because, the texts written by ball-point pens actually have two thin lines per
stroke. To human eye, this is not big problem, but OCR may not recognize the text. The Ball-point
Pen filter detects lighter areas compared to the surroundings and increases the density of the
lighter area. puts these two lines into one solid line. This can prevents cuts, void or too thin lines.
Содержание M3097DE
Страница 1: ...C150 E102 01EN M3097DE Image Scanner OEM Manual...
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Страница 42: ...3 3 Optional image function 3 21...
Страница 43: ...Image Functions 3 22 The conceptual image processing flow in the IPC mode is shown below...
Страница 45: ...Image Functions 3 24...
Страница 70: ...5 3 Cleaning 5 15 Two rollers are included Figure 5 5 Pick roller...
Страница 73: ...6 3 Figure 6 1 Jam clearance...
Страница 197: ...Scanner Interface Appendix A 124 5 Dimensions of the board For M3093EX DE and M3097DE...