ELiiXA® UC8/UC4
41
Eliixa_Color–revF 04/11
e2v semiconductors SAS 2011
o
White Balance Blue Gain
Ö
Read function : “
r wbab
<val>
” : Returns the White balance Blue Gain value.
Ö
Write function : “
w wbab
<val>
” : Sets the White balance Blue Gain value.
<val> is a Q13.10 unsigned value (from 0 to 7,999…).
The Blue Gain is calculated and displayed as follow : WBb = 1 + <val>
o
White Balance Nir or Mono Gain
(non available on RGB versions)
Ö
Read function : “
r wbai
<val>
” : Returns the White balance Nir/Mono Gain value.
Ö
Write function : “
w wbai
<val>
” : Sets the White balance Nir/Mono Gain value.
<val> is a Q13.10 unsigned value (from 0 to 7,999…).
The Nir/Mono Gain is calculated and displayed as follow : WBi = 1 + <val>
Color Matrix
What is the interest of the Color Matrix ?
After white balancing, the color space correction shall be done to improve the color response. This correction
consists in a linear operation to convert the RGB triplet form the camera color space to the RGB triplet of
the final color space. The final color space can be a monitor, a printer or others application specific color
space. For some specific applications where "absolute" color value is not mandatory the color space correction
can be bypassed.
R”
cm11
cm12
cm13
cm14
R’
B”
cm21 cm22 cm23 cm24
B’
G”
cm31 cm32 cm33 cm34
G’
N”
cm41
cm4é
cm43
cm44
N’
Each coefficient can be set in the following limits : -4 to +3,999
The last line and column are valid only for the RGB + Nir Version.
They are available for the RGB + Mono but have no signification for the color space tuning.
Attention
= This Matrix is shown here in the real order of the CCD color lines : Red, Blue and Green + 4
th
and
not the usual order: R,G,B.
Then for Commcam:
¾
the “cm1x” define the first line or the “Red Line”, “cm2x” the Blue line, cm3x the Green line and cm4x
the Nir Line.
¾
“cmx1” define the Red column, cmx2 the Blue column, cmx3 the Green column and cmx4 the Nir
column.
