Spyder3 SG-34 GigE Vision Color Manual 47
Teledyne DALSA 03-032-20124-00
204 DN in 8-bit mode, then the target value is (204/ 255) x 4096 = 3277 DN in 8-bit mode. Therefore,
you can set the target to 3300 DN: Target to Calibrate PRNU is 3300.
4. Calibrate the PRNU using the PRNU Calibrate command.
5. Use the Read FFC Calibration Result parameter to determine if your calibration was a success or
not.
6. To save the calibrated PRNU coefficients to the FCC coefficient set shown, use the Set PRNU Save
parameter.
7. After the above command is completed, both the FPN and PRNU coefficients are automatically
turned on.
Calibration results from the PRNU Calibrate command:
ï‚· Success
ï‚· Clipped to min > Color gain set minium, failure to reach target
ï‚· Clipped to max > Color gain set maximum, failure to reach target
ï‚· Timeout > FPGA did not return new end of line statistics or video line
ï‚· W08: Greater than 1% of coefficients have been clipped > Greater than 1 % of PRNU coefficients
have been calculated to be greater than the maximum allowable 8.
Subtracting Background
Use the Background Subtract features after performing flat field correction if you want to improve your
image in a low contrast scene. It is useful for systems that process 8 bit data but want to take advantage of
the camera’s 12 bit d igital processing chain. You shou ld t ry to make your darkest pixel in the scene equal
to zero.
Background Subtract Selector to select taps and Background Subtract (DN) to subtract a value in a
range from 0 to 4095 DN.
Setting Digital System Gain
Improve the signal output swing after a background subtract. When subtracting a digital value from the
digital video signal, using the Background Subtract (DN) feature, the output can no longer reach its
maximum.
Use this command to correct for this where:
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