Ricoh B264 Service Manual page 286

SERVICE PROGRAM MODE TABLES
4551* Scanner: Text: OCR
These SP codes set the MTF (Modular Transfer Function*
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
4551 3 MTF Filter Strength: Main Scan
4551 4 MTF Filter Strength: Sub Scan
4551 5 Smoothing Filter
4551 6 Brightness (Not Used)
4551 7 Contrast (Not Used)
4551 8 Isolated Dot Removal
*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.
B264/B265
Set the MTF coefficient for main/sub scan
directions.
[0~15/8/1]
0: Weakest 8: Default
Set the MTF strength for main/sub scan
directions.
[0~7/4/1]
0: Weakest 4: Default
Selects the level of smoothing.
[0~7/0/1]
0: Default (Off)
Sets the overall brightness of the image.
[1~255/128/1]
1: Weakest 128: Default
Sets the overall contrast of the image.
[1~255/128/1]
1: Weakest 128: Default
Sets the level of independent dot erasure to
improve the appearance of background.
[0~7/0/1]
0: Default (Off)
5-22
1
) for OCR scan mode.
15: Strongest
7: Strongest
7: Strongest
255: Strongest
255: Strongest
7: Strongest
SM