Fujitsu M3097DG Table 3.9 The deference of Dynamic Threshold Curve parameter

Image Functions

(3)Dynamic Threshold Curve

[A.4.7 SET WINDOW command/DTC mode]

For the Dynamic Threshold function, the threshold is changed with the average optical density of a small area (e.g. 5 x 5 pixel area).

Relation between the threshold and maximum density is formed as a curve when the threshold is expressed in the Y-axis and the maximum density in the X-axis. This curve is called “threshold curve”.

This function allows a customer to select a threshold curve. Several different curves are prepared, one is the OCR type and other is the image type. The characteristic of the curve is deferent between IPC- 2D and IPC-3D.

IPC-2D: The image type curve has steeper inclination in the middle of the curve. For OCR type curve, the customer can select type (inclination) and density level.

PC-3D: 8 curves are available which adjusts the sensitivity of the image

The parameter of Dynamic Threshold are as follows.

Table 3.9 The deference of Dynamic Threshold Curve parameter

Option	Parameter	Value	Selectable parameter	Default
IPC-2D	0 for OCR	B’xxxxx000’	Brightest
	to	to
	5 for OCR	B’xxxxx101’	Darkest	6 for
				image
	6 for	B’xxxxx110’	makes bright image to dark
	Image	B’xxxxx111’	makes dark image to bright
	7 for
	Image
IPC-3D	0	B’xxxxx000’	Decrease the noise
	to	to
	4	B’xxxxx100’	Normal	4
	to	to
	7	B’xxxxx111’	makes image sharp but increases
			noise

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