Allied International V2.4.0 Benutzerhandbuch

 OSCAR Technical Manual V2.4.0

92

The spectral response of a CCD is different of those of an output device or 
the human eye. This is the reason for the fact that perfect color reproduction 
is not possible. In each Oscar camera there is a factory setting for the color 
correction coefficients, see Chapter 

 on page 92.

Color correction is needed to eliminate the overlap in the color channels. This 
overlap is caused by the fact that:

•

Blue light:

is seen by the red and green pixels on the CCD

•

Red light:

is seen by the blue and green pixels on the CCD

•

Green light:

is seen by the red and blue pixels on the CCD

The color correction matrix subtracts out this overlap.

In AVT 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. With other 
AVT (color) cameras so far, you had the opportunity to use it or to switch it 
off.

Color correction is performed on all color CCD models before YUV conversion 
and mapped via a matrix as follows.

Sensor specific coefficients C

xy

 are scientifically generated to ensure that 

GretagMacbeth™ ColorChecker® colors are displayed with highest color fidel-
ity and color balance.

 Formula 3: Color correction

L

Color correction is deactivated in Mono8 or Mono16 mode 
(RAW image transport).

red

*

Crr

red

×

Cgr

green

×

Cbr

blue

×

+

+

=

green

*

Crg

red

×

Cgg

green

×

Cbg

blue

×

+

+

=

blue

*

Crb

red

×

Cgb

green

×

Cbb

blue

×

+

+

=