User`s manual

Linea 2K, 4K, 8K and 16K Camera User's Manual PRELIMINARY 39
Teledyne DALSA 03-032-20206-01
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 15: Flat Field Calibration in CamExpert
Calibration
The goal of calibration is for the camera to produce a uniform output image at a desired level while
imaging a uniform white object under conditions equal to the optical setup for the user‘s application.
 Configure the camera to the exsync and exposure timing they require, plus adjust the light level
for normal operation.
 Set the system gain to a value that best suits the application.
 The lens should be at the required magnification and aperture and be focused.
 As the white reference is located at the object plane, any markings or contaminants on its surface
(e.g. dust, scratches, smudges) will end up in the calibration profile of the camera. To avoid this,
use a clean white plastic or ceramic material rather than trying to rely on a paper reference.
(Ideally, the white object will be moving during the calibration process, as the averaging process
of the camera will diminish the effects of any small variation in the white reference.)
 Adjust the system gain until the peak intensity is at the desired DN level and then calibrate the
FPN. Use a lens cap to ensure that no light reaches the sensor.