Tamarisk
®
640
Software ICD
38
Table 64 – 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.
3.3.1 ICE Mode Min-Max Command – 0x22
(formerly known as ICE Mode Contrast Stabilization -
Deprecated, please use command 0x1E for ICE adjustments)
Camera RTL Rel version 01.00.3532 or newer is required together with compatible
CPU(Rel) version.
Description:
ICE Mode Min-Max command provides backward compatability with
previous ICE version using Indoor and Outdoor mode and sets the ICE strength to its
minimum or maximum level.
Command Format:
Table 65 – ICE Mode Min-Max Command Format
Byte
Value
Description
1
0x01
Start of message.
2
0x22
ICE Mode Min-Max Command ID.
3
0x02
Parameters length.
4, 5
0x0000 or 0x0001
0 preset value for low strength
