Tamarisk
®
320
Software ICD
37
Response Format:
Table 64 – Automatic Calibration Pending Activity Query VALUE Response Format
Byte
Value
Description
1
0x01
Start of message.
2
0x45
VALUE Response
3
0x02
Parameters length.
4, 5
Unsigned int
Type of Calibration Pending:
0: None.
1: Periodic Time-out.
2: Range Change.
6
checksum
Frame check sequence.
Table 65 – Automatic Calibration Pending Activity Query ACK Response Format
Byte
Value
Description
1
0x01
Start of message.
2
0x02
ACK Response
3
0x02
Parameters length.
4, 5
0x0025
AutoCal Pending Activity Query command ID.
6
checksum
Frame check sequence.
3.3 AGC COMMANDS
The system supports both conventional AGC operation and Image Contrast Enhancement (ICE)
operation. These operating modes are mutually exclusive.
The AGC module converts 14-bit video data to 8-bit data. The AGC has several operating modes
that control how this conversion takes place. Generally, a histogram of the input data is computed,
upper and lower limits of useful video data are extracted (black limit and white limit), and a
contrast stretch between those levels is performed. Two histogram equalization modes are
supported, AGC freeze and log2. The camera default is log2 mode. If the user has set the video
tap to pre-AGC these commands have no effect on the output video stream.
In addition, the system supports an Image Contrast Enhancement (ICE) mode. When enabled, the
normal AGC operation is disabled and ICE operation takes its place. ICE operation also converts
14-bit video data to 8-bit data, however, it does so in a way that details can be seen in the video
that would not otherwise be visible in AGC mode. The resulting video is generally superior to that
of AGC mode.