Piranha4 8K Color Camera User's Manual
43
Teledyne DALSA
03-032-20156-00
Calibrating the Camera
Important Note
:
to ensure best results, the conditions under which you calibrate the camera (e.g.
temperature and illumination) should be as close to the actual operating conditions as possible.
Figure 18: Flat Field Calibration in CamExpert
Overview
The following diagram and accompanying description explain the cameras signal processing chain. Each
element shown, with the exception of color interpolation, is user programmable.
Figure 19: Camera Calibration Process.
Digital Processing
1.
Fixed pattern noise (FPN) calibration is used to subtract any residual dark level that may occur in
the application.
2.
Photo response non uniformity (PRNU) calibration is used to correct for variations in the
illumination intensity and / or lens vignetting. When performed, this calibration will cause the
camera to have a flat response to a white target in the field of view. The output target value for
PRNU calibration can be set by the user.
3.
The white balancing gains are used set the red, green and blue response to equal values with a
white target in the field of view. The white balance gains can be individually set by the user, but
will be overridden by the camera when the camera performs PRNU calibration or white
balancing commands.
