AiP ABL-005IR, Manual

Page: 24 / 72

SWIR Line Camera Series User’s Manual
(OM150000013H-EN)
－ 24 －
4-5
Shading Correction
Shading Correction is performed by Flat Field
Correction(FFC), and FFC also compensates Dark level
Non Uniformity (DSNU), Pixel Response Non
Uniformity(PRNU) and shading image caused by lens or
lighting.This function is to remove non-uniformities in the
image.
The goal of this function is to acquire uniform image, and
it must be performed
under camera’s operating
environment. Calibration data can be stored up to 2.
command param1
CL ffc
0:Default
1:User Set1
2:User Set2
GV FlatFieldCorrectionLoad
command param1
CL ffcsave
1:User Set1
2:User Set2
GV FlatFieldCorrectionSave
FFC Procedure
step1
：
FFC Preparation
FFC is required to be performed in the operation condition.
First set exposure time and peltier temperature as it runs
in the working environment.
step2
：
DSNU Preparation
Cover the lens with the cover to block the light comes
through the lens.
step3
：
Perform DSNU Correction
Enter the targeting black level value and execute DSNU
correction. When it is completed, all pixels are calibrated
as linear as targeted black level in dark scene.
command param1 Description
CL Included in ffcadjustblack
-
Black level
target value :
0
～
2047(14bit)
GV FlatFieldCorrectionDarkTarget
command param1 Description
CL ffcadjustblack
-
Black level
Correction
Start
GV FlatFieldCorrectionDarkAdjustment
step4
：
PRNU, Lens Shading Correction Preparation
Set the camera with lens and the lighting as same as
operating condition and shoot the white target without
gradation.
step5
：
Perform PRNU, Lens Shading Correction
Enter White target level and perform PRNU and lens
shading correction. Once the correction is performed
correctly, you can get uniform image.
command
para
m1
Description
CL Included in ffcadjustwhite
-
White level target:
Black level 1
～ 16383(14bit)
GV FlatFieldCorrectionBrightAdjustment
command param1 Description
CL ffcadjustwhite
-
White level
Correction Start
GV FlatFieldCorrectionBrightAdjustment
NOTE
If the camera’s operating conditions are changed, it gives
an impact on image quality. This can be resolved by re-
calibration and before performing FFC set the camera
settings such as exposure time and peltier temperature,
lens IRIS and lighting source and perform FFC.
Lighting Camera
White Target
Light intensity
Before FFC
Light intensity
After FFC
Pixel
’
s response
Non uniformity
Pixel
’
s response
Uniformity
Pixel
’
s change
Video level
Video level
Light intensity
Before correction
Light intensity
After correction
Grey Level Grey Level
Light intensity
Before correction After correction
Light intensity
Video level Video level