Chapter 4
4-15
4.3.6.6 Shading Adjustment
0017-2641
The machine measures the density of the standard white plate, and stores the measured density data. It then processes the stored data to use it as the target value for
shading correction.
4.3.6.7 Shading Correction
0017-2642
The machine performs shading correction for each scan. It measures the density of the standard white plate, and compares the measured value with the target value
stored in the shading correction circuit to use the difference between the two as the shading correction value. The machine uses this shading correction value to
correct the variation among CMOS sensor pixels when scanning the original, thus evening out the image density level.
F-4-28
CMOS
sensor
output
Original density
Standard white plate
Characteristics
before correction
Target
value
Measurement
value
Characteristics
after correction
White
Содержание iR2018 Series
Страница 1: ...Oct 11 2007 Service Manual iR2030 2025 2022 2018 Series iR2030 ...
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Страница 47: ...Chapter 2 Installation ...
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Страница 81: ...Chapter 3 Main Controller ...
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Страница 97: ...Chapter 4 Original Exposure System ...
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Страница 100: ...Contents 4 4 8 2 Removing the Reader Heater Left 4 20 ...
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Страница 123: ...Chapter 5 Laser Exposure ...
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Страница 133: ...Chapter 6 Image Formation ...
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Страница 341: ...Chapter 17 Service Tools ...
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