Digital Video Out Allocation; Knee Function - JAI CV-M2 Operation Manual

6.1.6. Digital video out allocation

The set-up and the relations between the analog and digital video are shown in fig. 13.

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.
Digital Digital
[LSB] [LSB]
video out video out
1023 1023
890 890
32 32
Black level Black level
0 0
0 25 0 25
Fig. 13. Digital video bit allocation
Digital Digital
[LSB] [LSB]
video output video output
1023 1023
890 890
712 712
32 32
Black level Black level
0 0
0 0
Fig. 14. Knee function
CV-M2
100% 100%
level level
700 700
Knee max. Knee max.
Knee min. Knee min.
100% video 100% video
- 10 -
White White
clip level clip level
Analog Analog
video out video out
800 [mV] 800 [mV]
Scene Scene
luminance luminance
175% 175%