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6.1.6. Digital video out allocation
The set-up and the relations between the analog and digital video are shown in fig. 13.
0 25 700 800
[mV]
Analog
video out
0
32
890
1023
100%
level
White
clip level
Digital
video out
Black level
[LSB]
0 25 700 800
[mV]
Analog
video out
0
32
890
1023
100%
level
White
clip level
Digital
video out
Black level
[LSB]
Fig. 13. Digital video bit allocation
6.1.7. Knee function.
The knee functions can compress the signals in the highlighted areas. The slope over the knee
point is only 20%. The Knee point can be adjusted from 712 to 1023. With the knee at 890, the
camera can reproduce scene highlight up to 175%. The image contrast is reduced to 20% for
scene luminance higher than the knee point.
This function can be used in applications where the scene brightness is divided in an area in
shadow, and another in bright sunshine.
0
Scene
luminance
0
32
890
1023
100% video
Digital
video output
Black level
[LSB]
712
S
lope
10
0
%
S
l
o
p
e
2
0
%
Knee max.
Knee min.
175%
0
Scene
luminance
0
32
890
1023
100% video
Digital
video output
Black level
[LSB]
712
S
lope
10
0
%
S
l
o
p
e
2
0
%
Knee max.
Knee min.
175%
Fig. 14. Knee function