American Dynamics ADCI625-P221, Configuration And User'S Manual

Page: 36 / 142

View Menu
4-26 Configuration and User Guide
Automatic Gain Control (AGC)
Amplifies the video signal in scenes when there is not enough light to produce full video levels.
The maximum level of AGC is controlled by the Max Gain control. It is adjustable from 0dB (off) to
37dB. As gain is increased, the sensor noise is also amplified which can result in more noticeable
noise in the image.
Open Shutter
This is a technique that is used for really low light performance applications. It allows the shutter
speed to be slowed down further than normal to allow the sensor to collect more light. The
maximum level of Open Shutter is controlled by the Shutter Speed control. It is adjustable from
1/30 down to ½ second. The slower the Shutter Speed the higher the chance for image blur which
may affect moving object identification. It is only in effect during low light situations where an
image would not be obtainable otherwise and does not affect the camera performance in normal or
bright light situations.
Configuring AGC/Shutter Settings
Adjust Automatic Gain Control and Shutter Settings.
Procedure 4-10 Configure the AGC/Shutter Setting
Step Action
1
Select
Picture Settings
from the
View
menu.
2
Select the
Shutter Limit
tab.
The Shutter Limit tab displays.
3
Select a AGC/Shutter setting:
•
AGC off
- produces the cleanest image with the least noise but the worst low
light performance.
•
AGC on
- good low light performance with the chance for some noise.
•
openshutter
- best for low light performance. However there is a chance for
some noise and some image blur.
The default setting is ‘openshutter’.
Note
If you require “Real Time” video open shutter must be turned off to ensure that the
resulting video quality is acceptable for prosecution purposes.
- End -