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EC-11
User’s Manual
43
DALSA Corp.
03-32-00418-05
2. Ensure that the light intensity is characteristic of the final imaging environment.
Choose a light level between 200 and 220DN for optimum calibrated PRNU
performance.
3. Instruct the camera to perform a white light calibration using the command
correction_calibrate_prnu
. The camera will respond with OK> if no error
occurs.
4. Repeat the first three steps for forward and reverse directions if required.
5. After the calibration is complete, you can save these settings to non-volatile memory
so they will be remembered after power-down. To do so, issue the command
write_pixel_coeffs
.
If pixel coefficients (FPN or PRNU) exceed the maximum limit (511), they will be clipped
and a warning will be sent.
If an error occurs,
adjust the light intensity into the correct range for calibration. The
get_line
command will help to determine how much to increment or decrement the
light intensity. Or, change the gain value using the
set_gain
command.
To perform a white light calibration with an analog gain value:
Use the
correction_calibrate_prnu value
command. Where
value
is the analog
gain DN. This command sets the analog gain first to
value
before calculating the PRNU
coefficients range from 128 to 250. Use this command in calibrated mode only. If value is
left blank, current gain values are used.
Returning Calibration Results and Errors
After calibration, you can retrieve the results using the command
display_pixel_coeffs
.
This function returns all the pixel coefficients in the order
PRNU, FPN, PRNU, FPN…
The command
get_camera_parameters
returns all other settings.
Activating / Deactivating Video Correction
To switch between calibrated and uncalibrated modes, use the following
set_video_mode
commands:
•
To deactivate video correction (uncalibrated video), use the command
set_video_mode 0
.
•
To activate video correction (calibrated video), use the command
set_video_mode
1
.
•
The command
set_video_mode 2
, generates a test pattern.
Summary of Contents for EC-11-xxx40
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