User`s manual

40 PRELIMINARY Linea 2K, 4K, 8K and 16K Camera User's Manual

03-032-20206-01 Teledyne DALSA

 Once complete, remove the lens cap and perform a PRNU calibration using the desired target

value (in DN). You want all the pixels to match. This target value should be higher than the peak

values you saw while first setting up the camera.

 After several seconds the PRNU calibration will end and the correction coefficients will be

enabled. The system gain remains as first set.

 The coefficients and gain parameters, timing and control configuration can be stored in any one

of eight user sets and automatically retrieved at power-up or by user selection.

CamExpert has a default timeout of 20 seconds per command, which is too short for the FFC

calibration to run fully. You can change the default timeout by setting a command line argument in

the short-cut:

 Right click on the short-cut in the start menu and select properties.

 Add –timeout 60 to increase the command timeout to 60 seconds (See below). Note that you

must include a character space between the closing quotation mark in the target and the

hyphen before the timeout value.

 Repeat for desktop short-cut

Figure 16: Setting the camera’s timeout value

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.

Flat Field

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