User`s manual

Day/Night Functionality
72 Basler IP Camera
IR-Cut Filter Modes of Operation
The IR-cut filter mechanism in the camera has several modes of operation:
 In Auto mode, the camera automatically senses the change from night to day or from day to
night. When a day-to-night change is detected, the camera will automatically move the filter to
the open position. And when a night-to day change is detected, the camera will automatically
move the filter to the closed position. (see below for more information on how the auto mode
works).
 In Open mode, the IR-cut filter will be placed in the open position and kept there.
 In Closed mode, the IR-cut filter will be placed in the closed position and kept there.
 In Input Pin 0 Controlled mode, the state of input pin 0 will control whether the IR-cut filter is
open or closed. When the input is active, the filter will be open. And when the input is inactive,
the filter will be closed.
You can use the Day/Night tab in the Image Controls parameters (see page 16) group to set the IR
Filter Mode.
How the IR-Cut Filter Auto Mode Works
When the IR-cut filter is set to auto mode, the camera automatically detects the change from day
to night or from night to day and positions the IR-cut filter accordingly.
The IR-cut filter auto controls work by monitoring the "darkness level" in the scene that the camera
is viewing. If the scene is very dark it will have a high darkness level. And if the scene is very bright,
it will have a very low or even a negative darkness level.
As an example, assume that the camera is viewing a daytime scene and that the IR-cut filter is
closed. Because it is daytime, the darkness level measured by the auto controls will be very low. As
night approaches, the scene will become darker and the measured darkness level will gradually
rise. Once the measured darkness level rises above a specified "switch level" and remains there
for a period of time, the auto controls will assume that it is night and will change the camera to night
mode (i.e., open the IR-cut filter).
Now assume that the camera is viewing a nighttime scene and that the IR-cut filter is open. Because
it is nighttime, the darkness level measure by the auto controls will be high. As day approaches, the
scene will become brighter and the measured darkness level will gradually fall. Once the measured
darkness level falls below the "switch level" and remains there for a period of time, the auto controls
will assume that it is day and will change the camera to day mode (i.e., close the IR-cut filter).
The camera’s IR Filter Switch Level parameter lets you set the switch level. The higher you set
the switch level, the darker it must be before the camera will switch from day mode to night mode.
The camera’s IR Filter Wait Time parameter lets you set the time period (in seconds) that the
measured darkness level must remain above the switch level before the auto controls will decide
that it is nighttime and switch the camera to night mode. The parameter also sets the time period
that the measured darkness level must remain below the switch level before the auto controls will
decide that it is daytime and switch the camera to day mode. This parameter helps to keep the auto
controls from mistakenly sensing a momentary change in lighting conditions as a change from night
to day or from day to night.