Basler BIP2-DXXXXc-dn Manual de usuario descargar pdf (Pagina 100)

Day/Night Functionality AW00101507000

96 Basler IP Fixed Dome Cameras

IR-Cut Filter Modes of Operation

The IR-cut filter mechanism in the camera has several modes of operation. You can use the

Day/Night tab in the Image Controls parameters group (see page 17) to set the IR Filter Mode. The

modes of operation include:

 Auto - 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

night position. And when a night-to day change is detected, the camera will automatically move

the filter to the day position (see below for more information on how the auto mode works).

 Night - Move the IR-cut filter to the night position (filter is not in front of the sensor) and keep it

there.

 Day - Move the IR-cut filter to the day position (filter is in front of the sensor) and keep it there.

 Input Controlled - The state of one of the camera’s I/O ports will control whether the IR-cut

filter is in the night or the day position. When the port is active, the filter will be in the night

position. And when the port is inactive, the filter will be in the day position.

For the input controlled mode to work correctly, the direction on one of the camera’s I/O ports

must be set to "input", and the port’s function must be set to "IR switch". See Section 3.9 on

page 58 for more information about setting the camera’s I/O ports.

IR-Cut Filter Auto Mode Operation

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 in

the day position. 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

filter to the night position.

Now assume that the camera is viewing a nighttime scene and that the IR-cut filter is in the night

position. Because it is nighttime, the darkness level measured 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 move the filter to the day position.

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 the filter from day position to

night position.

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 filter to the night position. 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 filter to the day position. This parameter helps to keep the

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