User's Manual

No ASR – NP – 20847 – 01
10
2) Capture image
3) Average gray level of every block and every color
4) Calculate the difference of image data
Gradation chart
6-1-5. Variation of projection
6-1-5-1. Integrated value of main scanning direction
The difference to the integrated value around of the center is within 10%.
6-1-5-2. Computation method
Measurement area is without every 50 pixels from upper end and lower
end. Gamma is 1.
Procedure: 1) Calibrate image sensor with white reference card.
2) Capture image of same card.
3) Calculate integrated value of main scanning direction
4) Calculate difference of both card ends from the center
B
D
50 pixels
50 pixels
Vertical scanning direction
Main scanning direction
Measurement area
Center
Vertical scanning direction
Card end area