Piranha4 8K Color Camera User's Manual
45
Teledyne DALSA
03-032-20156-00
user sets and automatically retrieved at power up or by user selection. If a color correction matrix is
desired, the user can download and save a color correction file derived from the process described above.
Note:
For the color correction to be affective, the camera should have a white balanced output when color
correction is off.
1. Flat Field
This Flat Field set contains a number of features that are used to correct image distortion due to lens
vignetting and uneven illumination. .
Note
:
1.
Flat field coefficients consist of an offset and gain for each pixel.
2.
These are the first user corrections applied to the image.
3.
The flat field coefficients are saved and loaded with the user set.
Parameter
Description
flatfieldCorrectionMode
1.
Off – Flat field correction coefficients are not applied.
2.
On – Flat field correction coefficients are applied.
3.
Initialize – Sending this value will reset all current coefficients
(offsets to 0 and gains to 1x).
flatfieldCorrectionAlgorithm
1.
Basic – Direct calculation of coefficients based on current
average line values and target.
2.
LowPass – A low pass filter is first applied to the current
average line values before calculating the coefficients. Use this
algorithm if the calibration target is not uniform white or it s
not possible to defocus the image. Because of the low pass filter
this algorithm is not able to correct pixel-to-pixel variations and
so it is preferable to use the ―Basic‖ algorithm if possible.
flatfieldCalibrationTarget
1.
After calibration all pixels will be scaled to output this level
Range: 8 bit, 0 to 255 DN
flatfieldCalibrationSampleSize
1.
Number of lines to average when calibrating
2.
2048 or 4096
flatfieldCalibrationAOIOffsetX
1.
Together with ―flatfieldCalibrationAOIWidth‖ specifies the
range of pixels to be calibrated. Pixel coefficients outside this
range are not changed. It is possible to calibrate different
regions sequentially.
flatfieldCalibrationAOIWidth
flatfieldCalibrationFPN
1.
Save average line (of ―flatfieldCalibrationSampleSize‖ rows).
This is the first user correction applied – it is subtracted from
each line.
2.
This feature may not be of use to many users as the camera
already subtracts true ―dark current‖, but it may be useful for
some to provide a per pixel offset correction.
3.
Range 0 to 31 DN, 8 bit
4.
Default value is 0 DN for each pixel
flatfieldCalibrationPRNU
1.
Use ―flatfieldCorrectionAlgorithm‖ to calculate the per pixel
gain to achieve the specified target output.
