Spyder 3 CL User's Manual PRELIMINARY 59
DALSA 03-032-20008-03
Setting Analog Offset
Purpose: Sets the analog offset. The analog offset should be set so that it is
at least 3 times the rms noise value at the current gain. DALSA
configures the analog offset for the noise at the maximum
specified gain and as a result you should not need to adjust the
analog offset.
Syntax:
sao t i
Syntax Elements:
t
Tap selection. Use 0 for all taps or 1 to 2 for individual tap
selection if you are using the two tap model.
i
Offset value in a range from
0 to 255DN (12 bit LSB).
Notes:
•
To return the current analog offset value, use the command
gcp or get sao.
Example:
sao 2 35
Related Commands:
To update the analog gain reference:
Purpose: Sets the current analog gain setting to be the 0dB point. This is
useful after tap gain matching allowing you to change the gain on
all taps by the same amount.
Syntax:
ugr
Calibrating the Camera to Remove Non-Uniformity
(Flat Field Correction)
Flat Field Correction Overview
This camera has the ability to calculate correction coefficients in order to remove non-
uniformity in the image. This video correction operates on a pixel-by-pixel basis and
implements a two-point correction for each pixel. This correction can reduce or eliminate
image distortion caused by the following factors:
• Fixed Pattern Noise (FPN)
• Photo Response Non Uniformity (PRNU)
• Lens and light source non-uniformity
Correction is implemented such that for each pixel:
V
output
=[(V
input
- FPN( pixel ) - digital offset) * PRNU(pixel) – Background Subtract] x System Gain
where V
output
= digital output pixel value
V
input
= digital input pixel value from the CCD
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