Piranha Color Camera User’s Manual 39
DALSA 03-032-10211-01 5/9/2007
Note: Set coefficients used to combine three color streams, e.g.
White = C0 + (C1 x Red) + (C2 x Green) + (C3 x Blue)
C0 is a DN, whereas:
Coefficient = C1-3 / 4,096
Modified by set color command (SCL):
RGB: White
R|G|B: Red, Green, or Blue
All colors are not necessary because constructing white is
different
Factory (initial) values combine the three colors equally:
White = 0 + (0.33 x Red) + (0.33 x Green) + (0.33 x Blue)
Cn = 0.33 x 4,096= 1,365
Red = 0 + (1 x Red) + (0 x Green) + (0 x Blue)
C1 = 1 x 4,096= 4,096
Range of {-8,192 to +8,191} is equivalent to floating point
coefficients of {-2.0 to +1.999}
Step size is 0.000244
Values are saved with camera settings
Values may be viewed with GCP or GET SCC
Example: White = 100 + (0.25 x Red) + (-0.15 x Green) + (0.8 x Blue)
Therefore,
C1 = 0.25 x 4096 = 1024
C2 = (-0.15 x 4096) = -614
C3 = 0.8 x 4096 = 3276
OK>scl RGB
OK>scc 100 1024 -614 3276
3.9 Camera Selection Variables for details on commands that should be set before
performing any analog or digital adjustments.
3.14 Analog Gain and Analog Offset
All analog signal processing chain commands should be performed prior to FPN and
PRNU calibration and prior to digital signal processing commands.
Setting Analog Gain
Purpose: Sets the camera’s analog gain value. Analog gain is multiplied by
the analog signal to increase the signal strength before the A/D
conversion. It is used to take advantage of the full dynamic
range of the A/D converter.
Syntax:
sag t f
Syntax Elements: t
Tap selection. Use 0 for all taps. Color selection limits the
taps that may be selected by this command. See scl for
further information.
f
Gain value in a range from –10 to +10dB.
Notes: To return the current analog gain setting, use the command
gcp
or get sag.
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