Dalsa Spyder3 Manual de usuario Pagina 45

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Spyder3 GigE Vision SG-14 Monochrome Cameras User’s Manual 45
Teledyne DALSA 03-032-20123-01
Camera Calibration
Processing Chain Overview and Description
The following diagram shows a simplified block diagram of the cameras analog and digital processing
chain.
The analog processing chain begins with an analog gain adjustment, followed by an analog offset
adjustment. These adjustments are applied to the video analog signal prior to its digitization by an A/ D
converter.
The digital processing chain contains the FPN correction, the PRNU correction, the background subtract,
and the digital gain and offset.
All of these elements are user programmable and most are members of the Analog Controls and Data
Processing sets.
Figure 24: Signal Processing Chain
Analog Processing
Digital Processing
analog video
analog
gain
analog
offset
FPN
coefficients
digital
offset
PRNU
coefficients
background
subtract
digital system
gain
1k and 2k only
A B
C
D
G
FE
A. GainAbs,
CalculateCameraGain
B. BlackLevelRaw
C. CorrectionCalibrateFPN
D. DigitalOffsetRaw
E. CorrectionCalibratePRNU,
CalculatePRNUAlgorithmTargetValue
F. SubtractBackgroundRaw
G. DigitalGainRaw
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