Thanks to Infrared (IR) technology, today’s IP cameras can seize high-quality colour images – day or night. Learn more about this essential technology.
Day & Night Cameras for 24/7 Surveillance
See in the Dark With IR Cameras
Many network surveillance cameras today are designed for “Day/Night” applications. These cameras utilise sophisticated image sensors that can “see” beyond the limits of light visible to the human eye. During daytime or well-lit conditions, they produce high-quality colour images. As visible light drops below a certain level, the camera switches to night mode, relying on light in the infrared (IR) spectrum to create detailed black and white images.
IR Illumination Shines the Light
Most network surveillance cameras are capable of capturing near-infrared light. Invisible to the human eye, near-infrared light spans from 700 nanometres (nm) up to about 1000nm, which is just beyond the spectrum of visible colour. That is why day and night cameras capture black and white images in night mode. It is common for these cameras to use an IR-cut filter during the day to keep near-infrared light from obscuring or distorting colour images.
To augment the amount of infrared light available to a camera operating in night mode, many manufacturers include IR illuminators in the face of the camera. These consist of a number of infrared LEDs (light emitting diodes) that surround the lens of the camera. The LEDs project infrared light, providing visibility even in total darkness.
Fitting Applications of Any Size
Day/night capability is available on network cameras of almost every type, including Box, Dome, Bullet, PTZ and speed dome. Many megapixel/HD cameras also feature IR technology, as do inexpensive Wi-Fi cameras intended for home use. Because this feature is available across so many types of network cameras, IR is a viable option for almost any installation environment or application where low- or no-light surveillance is a must.