Tamarisk
®
320
Software ICD
47
Byte
Value
Description
3
0x02
Parameters length.
4, 5
0x0083
AGC Level Bias Set Command ID.
6
checksum
Frame check sequence.
3.3.12 AGC Gain Limit Set – 0xD1
Description
: The AGC Gain Limit and the AGC Gain Limit Noise Reduction Mode are
two independent blocks which control the AGC gain limit
The AGC Gain Limit Set command allows the user to configure the minimum allowable
difference between the white limit and black limit for AGC histogram processing. A
smaller value allows the maximum gain to be higher (e.g., allows a smaller difference
between the black limit and the white limit). In low-contrast scenes, this smaller value will
allow more sensitivity but will also gain-up any system noise. A larger value will prevent
objectionable gaining-up of system noise but will reduce sensitivity in low-contrast scenes.
The AGC Gain Limit Noise Reduction Mode (which is an NV parameter) works to limit
the pixel-to-pixel difference and thus reducing the effects of noise across the entire scene.
This limit has the effect of smoothing out the image and hence the AGC provides a better
overall image.
It is possible (but not recommended) to enable both the AGC Gain Limit and the AGC
Gain Limit Noise Reduction mode. By default the AGC Gain limit is disabled and the
AGC Gain Limit Noise Reduction mode is enabled.
NOTE
This command has no effect if ICE is enabled.
Command Format:
Table 89 – AGC Gain Limit Set Command Format
Byte
Value
Description
1
0x01
Start of message.
2
0xD1
AGC Gain Limit Set Command ID.
3
0x02
Parameters length.
4,5
unsigned integer
0 to 4095
AGC gain limit value.
0 = gain limiting disabled
32 = gain limited to gain factor = 4.0
64 = gain limited to gain factor = 3.0
128 = gain limited to gain factor = 2.0
256 = gain limited to gain factor = 1.0
