Guppy PRO Technical Manual
V4.1.2
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Green light:is seen by the red and blue pixels on the CCD
The color correction matrix subtracts out this overlap.
Color correction in Allied Vision cameras
In Allied Vision cameras the color correction is realized as an additional step in
the process from the sensor data to color output.
Color correction is used to harmonize colors for the human eye.
Guppy PRO models have the so-called color correction matrix. This means: you
are able to manipulate the color-correction coefficients yourself.
Color correction: formula
Before converting to the YUV format, color correction on all color models is
carried out after Bayer demosaicing via a matrix as follows:
GretagMacbeth ColorChecker
Sensor-specific coefficients C
xy
are scientifically generated to ensure that
GretagMacbeth™ ColorChecker® colors are displayed with highest color
fidelity and color balance.
These coefficients are stored in user set 0 and cannot be overwritten (factory
setting).
Changing color correction coefficients
You can change the color-correction coefficients according to your own needs.
Changes are stored in the user settings.
Formula 5: Color correction
red*
Crr
red
Cgr
green
Cbr
blue
+
+
=
green*
Crg
red
Cgg
green
Cbg
blue
+
+
=
blue*
Crb
red
Cgb
green
Cbb
blue
+
+
=
