Dalsa Piranha4 Series, Руководство пользователя

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74 Piranha4 2K and 4K Camera Color User's Manual
03-032-20180-06 Teledyne DALSA
coefficient and gain parameters, timing and control configuration etc can be stored in any one of eight
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 effective, the camera should have a white balanced output when color
correction is off.
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 35: 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
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