Konica Minolta bizhub PRESS 1250 Watkiss PowerSquare Sheet Feeder User Manual - Page 82

OMR Calibration definition, 9.4.1 OMR Calibration sheet

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9.4 OMR Calibration definition OMR Calibration is a printed sheet with 2 contrast areas used to detect the marks; The detection contrast area and the background contrast area. The sheet itself can be used as background contrast area. A printed mark read on sheet gives to the PSF the end of paper feeding sequence. A calibration should be done to define the mark contrast according to the paper background color. The PSF is factory set for a black mark on a white background sheet. It is therefore possible to calibrate the sensor for a black mark on grey or yellow background (for example). 9.4.1 OMR Calibration sheet The calibration sheet 9134156 (supplied with the machine) can be used as calibration sheet. The calibration sheet can be printed with the following parameters : - Contrast areas in centered position. - Intrack and crosstrack dimension of the contrast area. - Uniformity of the contrast area and sharpness lines. Calibration sheet < 50mm Crosstrack middle line 10mm < 50mm ≥ 50 mm These contrast areas and the background of the mark to detect must be the same colour and very regular. Intrack middle line This contrast area and the mark to detect must be the same colour and very regular. Operator Manual Initial issue: 05/11 Page 9 - 82 Latest revision: 03/13

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Operator Manual
Page 9 - 82
Initial issue: 05/11
Latest revision: 03/13
9.4 OMR Calibration definition
OMR Calibration is a printed sheet with
2
contrast areas used to detect the marks;
The detection contrast area and the background contrast area.
The sheet itself can be used as background contrast area.
A printed mark read on sheet gives to the PSF the end of paper feeding sequence.
A calibration should be done to define the mark contrast according to the paper background color.
The PSF is factory set for a black mark on a white background sheet.
It is therefore possible to calibrate the sensor for a black mark on grey or yellow background
(for example).
9.4.1 OMR Calibration sheet
The calibration sheet 9134156 (supplied with the machine) can be used as calibration sheet.
The calibration sheet can be printed with the following parameters :
- Contrast areas in centered position.
- Intrack and crosstrack dimension of the contrast area.
- Uniformity of the contrast area and sharpness lines.
10mm
Calibration sheet
Crosstrack middle line
Intrack middle line
These contrast areas and the
background of the mark to detect must
be the same colour and very regular.
This contrast area and the mark
to detect must be the same
colour and very regular.
< 50mm
< 50mm
≥ 50 mm