7 Camera parameters
3DPIXA
CD40131 Version 1
81 / 99
Maximum reachable target value:
Target value = 1023
– max dark reference value (with active black level correction)
The typical dark reference values are about 4…16 (in 8 bit) in the raw image date.
The level of the target value has to be adapted to the position of the white reference
control zone (see Fig. 51, p. 81). For zone 1, the values have to be set to a lower value
than for zone 2. If the target values for zone
1 are too high, the image center will be
saturated.
Fig. 51: Raw video values (red), theoretical maximum values (green) and dark reference
values (blue) as a function of the number n of pixels (with 10 bit GUI value range)
1
Control zone 1
2
Control zone 2
7.2.2
Analog Coarse Gain
This parameter describes the coarse gain parameter of the camera. Its operation will take
place in the first step of analog image processing.
Function
Pre-amplification after CCD and before analog gaining
Channels
Red, Green, Blue
Front; Rear
Type
–3 dB; 0 dB; +3 dB; +6 dB
Logarithmic
Notes
Use this parameter for a rough adjustment of gaining at the first step.
Camera
Value CST
Lower limit
All
–3 dB
0 dB
+3 dB
Upper limit
All
+6 dB
