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CSG14K_CSG8K 데이터시트(PDF) 89 Page - ams AG

부품명 CSG14K_CSG8K
상세설명  13.8Mp_8.3Mp High Speed Global Shutter CMOS Image Sensor
PDF  113 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
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CSG14K_CSG8K
Functional Description
Datasheet
• PUBLIC
DS000571
• v1-00 • 2020-Dec-15
112
│ 88
Black Level Mapping
The black level at a certain point in the pixel data path on the sensor is the analog level or digital word
that corresponds to the level of an ideal dark pixel (zero illumination). In practice, it is the average of
all real dark pixels (optically shielded) at that point in the data path.
The black level at the output of the ADC does not equal the desired black level in the output images
for several reasons including the ADC architecture, fixed pattern and temporal noise (row noise, frame
noise), dark current and so on.
As illustrated in the figure below, the black level at the ADC output needs to be mapped on the target
black level at the sensor output.
Figure 110:
Black Level Mapping
The mapping is done using the equation:
Equation 13:
������������������������������������������_������������������ = ������������������������[������������������������������������_������������������ − ������������������������������_������������������������������������������������_������������������ + ������������������������������_������������������������������������������������������_������������������]
BLACK_LEVELDATA_OUT is the target black level at the output of the sensor. It is specified with the
register EOB_TARGET. The recommended minimal setting is 30 (lower settings may decrease the
2
^15-1
0
BLACK
LEVEL
black
white
VALID
RANGE
row noise
frame noise
ADC_OUT
target
OUTPUT
RANGE
DATA_OUT



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