Axis P3904-R Mk User Manual page 20

AXIS P3904-R Mk II Network Camera
About video settings
Wide Dynamic Range
Wide dynamic range (WDR - forensic capture) provides balanced images in scenes where there is a considerable contrast between
light and dark areas in the image. The camera automatically handles the transition between such scenes and low-light conditions.
Important
Use WDR in combination with automatic exposure control. Other exposure settings could produce undesirable results.
Traffic Light mode
This mode will decrease the exposure, so that traffic lights and other bright light sources will not saturate when in view at night.
In this mode, it is possible to distinguish the color of the traffic lights at any surrounding light level. This mode is also favorable
for license plate recognition.
Note
The decrease in exposure will make the whole image darker, during conditions above.
This setting will disable the Exposure Settings for best results.
Exposure Settings
Exposure is the amount of light the camera's sensor captures for a scene. Too much light results in a washed out image and too
little light results in a dark image.
Exposure value - Use the Exposure value slider to adjust the overall brightness of the image.
Exposure control - Select a suitable option to control exposure.
For most scenes, the Automatic option will provide the best results. The shutter speed is automatically set to produce optimum
image quality. Fluorescent lamps or other light sources can sometimes cause flickering in the image. To reduce flicker in the image,
select the Flicker option that matches the power line frequency.
The Hold current option locks the current exposure settings.
Max exposure time - Shutter speed, also called 'exposure time', stands for the length of time the camera shutter is open, thereby
exposing the camera sensor to light. If shutter speed is fast it can freeze action effectively. If shutter speed is slow, it can cause
moving objects to appear blurred. Decreasing the exposure time will reduce motion blur.
Exposure zones - This setting determines which part of the image is used to calculate the exposure. For most situations, the Auto
setting can be used.
You can select a predefined area by defining Include and Exclude windows within the image. Exclude windows exclude areas that are
too bright or dark, and Include windows include areas in the scene that have better lighting which will contribute to the exposure data.
There must be at least one Include window. There can be a total of ten Include and Exclude windows to tailor the exposure zone.
Note that an Exclude window is effective only when placed inside an include window.
Tip: If an area is extremely bright, draw an Include window to cover the whole area and define Exclude windows within it to
block out the bright areas.
How to set up normal and low light
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 movement at night. To be able to,
for example, recognize faces or license plates, move the normal light priority slider toward low motion blur. At night time, 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.
Normal light priority
1. Use the slider to set the Priority between Low motion blur and Low noise. When prioritizing low noise (slider all the way
to the left), the camera will automatically decrease shutter speed as brightness decreases. When the shutter speed reaches
1/30 s, the camera increases gain until the set maximum gain for normal light is reached.
20