AXIS Q1604 Network Camera
Video and Audio
Shutter & Gain
The shutter and gain settings affect the amount of motion blur and noise in the image. To adapt to different lighting, available
storage space and bandwidth, it is often necessary to prioritize either low motion blur or low noise. The Axis product allows
using different prioritization in normal light and in low light.
Shutter speed
is related to the amount of time the shutter is opened and is measured in seconds (s). A slow shutter speed allows
more light to reach the sensor and can help produce a brighter image in low light situations. On the other hand, a slow shutter
speed can cause moving objects to appear blurry.
Set
Shutter
to
•
Auto
to set the shutter speed automatically. If required, use
Max shutter
to limit the shutter speed to prevent the frame
rate from being reduced.
•
Fixed
to use a fixed shutter speed.
Gain
, measured in decibel (dB), is the amount of amplification applied to the image. A high gain may provide a better image in low
light situations but will increase the amount of image noise.
Set
Gain
to
•
Auto
to set the gain automatically. If required, use
Max gain
to limit the applied gain.
•
Fixed
to use a fixed gain.
When
Shutter
and
Gain
are both set to
Auto
, it is possible to set the
Priority
between low motion blur and low noise manually and to
use a different
Priority
in
Normal Light
and in
Low Light
.
Example
Consider an area where people or vehicles move during the day, but where there should be no movements during night. To be able to,
for example, recognize faces or license plates, move the normal light priority slider toward low motion blur. At nighttime, motion
detection is more important than identification. Motion blur is acceptable and since low light can cause a lot of noise, move
the low light priority slider toward low noise.
Example
If storage space or bandwidth is limited, try using a lower gain. This will reduce image noise and produce smaller image files.
Day/Night
The IR cut filter prevents infrared (IR) light from reaching the image sensor. In poor lighting conditions, for example at night, or when
using an external IR lamp, set the IR cut filter to
Off
. This increases light sensitivity and allows the product to “see” infrared light. The
image is shown in black and white when the IR cut filter is off.
If using automatic
Exposure control
, set the IR cut filter to
Auto
to automatically switch between
On
and
Off
according to the
lighting conditions.
The
Day/Night shift level
bar helps determine when the camera will shift from day mode to night mode. Normally, the camera
automatically changes mode from day to night when very dark (level 100 in the slider). By setting
Day/Night shift level
to a
lower value, the camera will change to night mode earlier.
Overlay
Overlays are used to provide extra information, for example for forensic video analysis or during product installation and
configuration. Overlays are superimposed over the video stream.
An overlay text can display the current date and time, or a text string. When using a text string, modifiers can be used to display
information such as the current bit rate or the current frame rate. For information about available modifiers, see
File Naming &
Date/Time Formats
in the online help
.
It is also possible to display text when an action rule is triggered, see
Use Overlay Text in an Action Rule
.
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