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AW00101507000 Day/Night Functionality

Basler IP Fixed Dome Cameras 95

6 Day/Night Functionality

6.1 Introduction

Basler IP Fixed Dome Cameras are equipped with day/night functionality. Cameras with day/night

functionality are well-suited for use in areas with natural lighting during the day and artificial lighting

at night. And when used with a supplemental IR illuminator, these cameras can produce high quality

images in areas with little visible light, which makes them very useful in applications with poor

lighting.

During daylight, a day/night camera delivers color images. As evening approaches and the daylight

level decreases, the camera can automatically switch to night mode. In night mode, the camera

makes use of near-infrared (IR) light to deliver high quality black and white images.

Daylight includes both visible light and near-infrared light. Visible light ranges in wavelength from

about 400 to 750 nanometers and near-IR light from about 750 to 1000 nanometers. Unlike the

human eye, the sensor in color IP cameras is sensitive to both visible light and to near-infrared light.

During the daytime, the camera’s sensitivity to near-infrared light causes a problem - near-infrared

light distorts the colors in the captured images as perceived by the human eye. To avoid this

problem, the cameras include an IR-cut filter located in front of the imaging sensor. This filter blocks

the near-infrared light present in daylight and ensures proper colors in the captured images.

Day/night cameras include a mechanical mechanism that allows the IR-cut filter to be automatically

removed from in front of the sensor. When daylight decreases as evening approaches, the

day/night camera senses the change, it goes into night mode, and the internal mechanism in the

camera removes the IR-cut filter from in front of the sensor. This allows the camera to use any

available near-infrared light to produce black and white images. An IR illuminator that provides

infrared light can be placed in the area where the camera is located to enhance its ability to produce

high quality images in low light or in nighttime conditions.

Definitions

When referring to the camera’s IR-cut filter:

 the term night position means that the mechanical mechanism in the camera has positioned

the IR-cut filter so that it is not in front of the sensor.

 the term day position means that the mechanical mechanism in the camera has positioned

the IR-cut filter so that it is in front of the sensor.

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