Spyder 3 CL User's Manual PRELIMINARY 71
DALSA 03-032-20008-03
7.7 Look-Up Tables
Note: This information only applies to the 4k model camera.
The flat field corrections FPN and PRNU assume a linear response to the amount of light
by the sensor, output node, analog amplifier, and analog to digital converter. To correct
any non-linearity in this system of components a Look-Up Table (LUT) has been
implemented in the FPGA for each tap immediately after the ADC. The LUT adds a
signed value (-256 to +255) indexed by the 10 MSB of the input value.
Calibrate Input LUT
Purpose: Calibrates the current input look-up table for correcting non-
linearity in the analog chain (CCD sense node and analog-to-
digital conversion).
Syntax:
cil
Syntax Elements:
Notes: This command calibrates all taps within the ROI.
To calibrate:
Place a white reference in front of the camera. This is similar to a
PRNU calibration.
In addition:
Use the
wil command to write the LUT to non-volatile memory.
Use the
eil command to enable use of the LUT.
Use the
roi command to limit the taps calibrated and to limit
which pixels are used for calibration. If a tap is not in the region
of interest, then it will not be calibrated and left at current values.
Press spacebar to abort this command.
Rerun this command if the analog gain or operating temperature
changes.
Example:
Enable Input LUT
Purpose: Enables or disables the use of the input look-up tables for the
correction of the analog chain non-linearity.
Syntax:
eil flag
Syntax Elements:
0
Disable
Enable
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