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9.13 Flat Field Correction
The Flat Field Correction feature improves the image uniformity when you acquire a non-uniformity image due to
external conditions. The Flat Field Correction feature can be summarized by the following equation:
IC = {(IR – IB) × M} / (IF – IB)
Where,
IC : Level value of corrected image;
IR : Level value of original image;
IB : Black offset value;
M : Average value of image after correction;
IF : Level value of Flat Field data.
In actual use conditions, generate a Flat Field data (IF) and perform the Flat Field Correction feature according
to the following procedures.
1.
Set the binning mode as desired.
2.
Set the number of frames to be acquired for generating the Flat Field data into the Ffc Frames parameter.
3.
Execute the Ffc Generate parameter. The series of frames will be averaged and scaled down to 1/16 pixel.
Then, the camera will generate the Flat Field data.
4.
Execute the Ffc Save parameter to save the generated Flat Field data in the non-volatile memory.
When the Flat Field data are applied for correction, the Flat Field data which were scaled down will be
enlarged via Bilinear Interpolation as shown in the Figure 9.24.
5.
Set the average value in the Ffc Target Level parameter and the Ffc Mode parameter to On. Then, the
Flat Field data will be applied to the camera.
Executing the Ffc Generate parameter will ignore the current camera settings and will
temporarily change the camera settings to operate under the following default conditions.
When the generation of the Flat Field data is completed, the original settings of the
camera will be restored. If the Trigger Mode parameter is set to On and the Trigger
Source parameter is set to Software, you must provide the number of trigger signals
equal to the current Acquisition Frame Count parameter setting.
Every time you change the binning mode, you must generate the Flat Field data again.
Readout Mode:
Trigger Mode:
Channel Mode:
Defective Pixel Correction:
72 of 94
Normal
Free-Run
Single
ON
VA GigE series
RA14-131-003
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