Dalsa Piranha4 User Manual page 33

Adjust Gain
Begin by adjusting the system gain
intensity of the three colors is at the desired DN level. You may want to use the white
balance gains to adjust the peak of each color to be a similar DN value, but this is not
necessary.
FPN Calibration
Before proceeding any further, it is desirable to complete an FPN calibration
(flatfieldCalibrationFPN). This is best performed using a lens cap to ensure no light gets into
the camera.
PRNU Calibration
With FPN calibration complete, a PRNU calibration (flatfieldCalibrationPRNU) can be
performed using the average value of the line pixels.a target value. Once PRNU calibration
is complete, it will take several seconds, all three colors should be at the target value, white
balance gains will have been adjusted to suit the cameras optimum setup for a balanced
white output, and the correction coefficient will be enabled. The system gain will remain as
originally set.
Save Calibration
The coefficient and gain parameters, timing and control configuration, and so forth, can be
stored in any one of four user sets and automatically retrieved at power up or by user
selection.
Color Correction Matrix
The RGB values output by the camera depend on the spectral responsivity of the camera
and on the color temperature of the light source. For example, with a light that is more blue
than red, the blues will be brighter and the reds dimmer. The camera includes a 3 x 3
matrix to correct this:
If a color correction matrix is desired, the user can enter and save a color correction matrix
using the colorTransformationSelector, ColorTransformationValueSelector,
ColorTransformationValue
For the color correction to be effective, the camera should have a white balanced output
when color correction is off.
Note: An application note describing a color transformation matrix calibration
(document #03-032-20181) is available. Please contact Teledyne DALSA
Support for more information.
Piranha4 8K Color Camera User's Manual
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Camera Operation • 33