Table of Contents
Advertisement
Digital transmission uses video compression (usually based upon the difference in subsequent
frames) and the required bandwidth is therefore dependent upon the difference in scene
content. Features such as AGC and sharpness enhancement etc., can generate signal noise
which will be interpreted as a change in scene content and increase the bandwidth required to
transmit the video information. The Discrete Cosine Transfer (DCT) feature may be used to limit
the system bandwidth requirements when the camera is connected to a digital network via an
encoder. When set to
is increased. The default setting is
This feature can increase the apparent sharpness of the perceived image by enhancing the
edges of objects within the scene. The default setting is
Two different gamma correction options are available
to provide increased visibility within the darker areas of a scene, or
response. The default setting is
The Automatic Gain Control feature can improve picture quality when the level of scene
illumination is low. Select
therefore the default setting.
The Electronic Iris (EI) feature compensates for excessive light levels by automatically adjusting
the shutter speed of the camera. Select
This switch is used to select the synchronisation mode of the camera. When the camera is
connected to an AC supply, the Line-lock (
frame rate to the mains frequency so that each camera in the system is triggered at the same
point on the supply’s AC-cycle. See also
The default setting is
In normal operation, the LED on the front panel of the camera is illuminated when power is
connected to the camera. This can cause problems with reflections when the camera is
located inside a camera housing or dome enclosure. Switch L, figure 1, allows the LED to be
turned on or off. The default setting is
, the camera’s AGC circuit is limited to 12dB and chroma suppression
.
.
or
. For most applications, the AGC feature should be
or
.
.
DISCRETE COSINE TRANSFER ON/OFF
.
and
AUTOMATIC GAIN CONTROL (AGC) ON/OFF
ELECTRONIC IRIS (EI) ON/OFF
. The default setting is
SYNCHRONISATION SELECTION (LL/INT)
) mode can be used. This locks the camera’s
SHARPNESS ON/OFF
GAMMA SELECTION
. Use this switch to select
for a more linear
and is
.
POWER LED ON/OFF
.
7
Advertisement
Table of Contents
