SERVICE PROGRAM MODE TABLES 20 June 2005
5-22
Scanner: Text: OCR 4551*
These SP codes set the MTF (Modular Transfer Function*
1
) for OCR scan mode.
Note:
• As a general rule, adjust the level (coefficient) before adjusting the strength.
• Raising the brightness or contrast level may increase the occurrence of moiré
4551 1 MTF Filter Level: Main Scan
4551 2 MTF Filter Level: Sub Scan
Set the MTF coefficient for main/sub scan
directions.
[0~15/8/1]
0: Weakest Å 8: Default Æ 15: Strongest
4551 3 MTF Filter Strength: Main Scan
4551 4 MTF Filter Strength: Sub Scan
Set the MTF strength for main/sub scan
directions.
[0~7/4/1]
0: Weakest Å 4: Default Æ 7: Strongest
4551 5 Smoothing Filter Selects the level of smoothing.
[0~7/0/1]
0: Default (Off) Æ 7: Strongest
4551 6 Brightness (Not Used) Sets the overall brightness of the image.
[1~255/128/1]
1: Weakest Å 128: Default Æ 255: Strongest
4551 7 Contrast (Not Used) Sets the overall contrast of the image.
[1~255/128/1]
1: Weakest Å 128: Default Æ 255: Strongest
4551 8 Isolated Dot Removal Sets the level of independent dot erasure to
improve the appearance of background.
[0~7/0/1]
0: Default (Off) Æ 7: Strongest
*1 When the CCD converts the original image to electrical signals, the contrast is reduced due to
the influence that adjacent white and black pixels have on one another as a result of lens
properties. Typically, you will see very narrow width and spacing between black and white areas.
MTF corrects this problem and emphasizes image detail.
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