OPERATING AND USER MANUAL Q-12 CoaXPress series
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Adimec
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7.17.1 LF_FF_Correction
| RW | B |
True
Enables the spatially low frequency flat field correction.
False
Disables the spatially low frequency flat field correction.
This feature is automatically updated if any of the following features is changed:
BandEnable
7.17.2 LF_FF_ReferencePoint
| RW | B |
Peak
Position of the reference video level after FFC calibration will equal the
maximum video level present during FFC calibration. See Figure 7-13a.
Average
Position of the reference video level after FFC calibration will equal the
average video level present during FFC calibration. See Figure 7-13b.
7.17.3 LF_FF_SetSelectionMode
| RW | B |
Manual
In this mode the active FFC set is selected manually with the
LF_FF_SetSelector feature.
Sequencer
In this mode the active FFC set is selected by the sequencer. The
sequencer advances one entry per acquired image.
Histogram
Histogram
Videolevel [DN]
Videolevel [DN]
Pixelcount
Pixelcount
Pixelnumber
Pixelnumber
Videolevel
[DN
]
Videolevel
[DN
]
Gain < 1
Gain > 1
Only gain values > 1
Peak FFC calibration method
Average FFC calibration method
Cons: the average videolevel changes
Pros: all pixels will saturate at full scale
because of a gain > 1
Cons: pixels with a gain < 1 cannot saturate
Pros: the average videolevel does not change
a)
b)
Figure 7-13: A visual representation of the low frequency non uniformity (red line) and how the LF-FFC function
can correct for this (blue line). The LF-FFC function offers the possibility to have the flat field equal the maximum
video level (a) or the average video level (b).
