IMAGING: DAY & NIGHT

MECHANICAL INFRARED (IR) FILTER

Mechanical infrared (IR) filter

All Day/Night cameras with color sensors need to block IR light in order to properly render color.

•If a camera captures both visible and IR light, the camera is more light sensitive and can be further illuminated with IR LEDs.

•A camera that captures IR light goes into black-and-white mode to avoid issues with improper coloring.

About mechanical IR filters

A mechanical IR filter (or ICR) is a device that can move an IR filter in and out of the optical path.

•An IR cut filter is a thin piece of blue or clear glass that’s used to filter IR light (letting only visible light through).

•In low light, the IR cut filter is moved out of the way and the sensor “sees” both IR and visible light. The camera automatically goes into black-and-white mode to avoid any color imperfections.

About mechanical IR filters

Visible light passes through while IR light is blocked. Visible light passes through as well as IR light.

IR ILLUMINATION

IR illumination

Infrared or IR Illuminators can be external to the camera or integrated into the camera itself. They are usually IR LEDs.

Integrated IR Illuminator External IR Illuminator

EXPOSURE & LICENSE PLATE CAPTURE

Exposure & license plate capture

Exposure (or shutter speed) is the amount of time an image (single frame of video) is exposed to light.

•It’s easy to capture license plate information in the daytime.

•However, using the same camera to also capture readable plates at night requires a little extra camera configuration. You must limit the camera’s maximum exposure time (through image settings).

Exposure & license plate capture

Motion Blur due to longexposure (shutter speed)

Overexposed plate due to long exposure (shutter speed)

BUSINESSBLOG.US.DLINK.COM