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CSG14K_CSG8K 데이터시트(PDF) 89 Page - ams AG |
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CSG14K_CSG8K 데이터시트(HTML) 89 Page - ams AG |
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89 / 113 page ![]() Document Feedback 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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