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AXIS Q3709-PVE Network Camera
Video
Exposure priority - When Motion is prioritized and maximum Shutter time is set to a small value, motion blur in the image is
minimized. This can be useful for recognition of moving objects such as people and vehicles. However, prioritizing motion may cause
an increase in image noise, especially in low light situations. When Low noise is prioritized and Gain is set to a small value, image
noise is minimized. The file size is reduced, which can be useful if storage space or bandwidth is limited. However, prioritizing low
noise may result in a very dark image, especially in low light situations.
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.
Set Exposure priority to
•
Automatic to set the shutter speed automatically.
•
Low motion blur to prioritize low motion blur.
•
Low noise to prioritize low noise.
It is also possible to set the Min and Max limits for Shutter and Gain.
Shutter 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.
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.
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.
Align the Channel Images
The lenses in the Axis product are aligned during production. However fine tuning of the image alignment may be required depending
on, for instance, the distances within the scene. Also a larger overlap between the images will guarantee a complete coverage of
the whole scene to a larger extent.
To set the individual image alignment for each channel go to Setup > Video > Capture Alignment and use the LEFT/RIGHT and
UP/DOWN buttons or enter a value in pixels directly.
View Area
A view area is a cropped part of the full view. Each view area is treated as a video source in Live View and has its own video
stream and PTZ settings.
When setting up a view area it is recommended that the video stream resolution is the same size as or smaller than the view area
size. Setting the video stream resolution larger than the view area size implies digitally scaled up video after sensor capture,
requiring more bandwidth without adding image information.
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