As a company built on solid engineering, we designed both our 2 Mega Pixel and 5 Mega Pixel camera heads. Both cameras incorporate a professional mechanical cut IR filter and lens system and have builtin IR illumination as standard and can be fitted with our 850nm or 940nm IR pods.
Unlike some camera systems that require an external 3rd party IR Illuminator our inbuilt IR illumination and IR cut filter are both fully synchronised to prevent dead spots in the cameras images when switching over to night mode and the IR illumination being activated.
The standard image sensor on most low cost camera systems (and some expensive ones) is 0.3 Mega pixels. This type of image sensor will produce an image size of 640 x 480 Pixels, which is like computer screens back in the 80’s. There are other cameras that operate at 1.3 Mega Pixels giving a resolution of 1280 x 720 pixels, much like our first generation systems, but our latest generation of camera heads supports both 2 Mega Pixel and 5 Mega pixel image sensors which gives a maximum resolution of 2592 x 1944 pixels.
So why did we design the mechanical IR-Cut filter technology?
For a camera to see at night the subject needs to be illuminated with Infrared light (IR), this is achieved by our 850nm or 940nm pods. The 850nm wavelength is standard for most applications but the camera does produce a faint red glow for a few seconds at direct exposure, but otherwise it’s not visible to the naked eye. The main advantage of the 940nm wavelength is its complete invisibility as the light source does not emit any glow. This is imperative for law enforcement and military, as well as for traffic and railroad applications where a red light can be interpreted as a signal. The disadvantage is the illumination range is 30-40% shorter, compared to 850nm wavelength.
To prevent what is called ‘colour wash’ a colour lens is fitted to the camera which has a built in IR filter for normal sun light images. The problem with a same colour lens is that it restricts the IR light needed for night vision images. Thus the night vision images are restricted and the effective range is greatly reduced.
Vision Link took a different approach after a lot of research and testing.
We designed in a mechanical IR-Cut filter lens, so the camera captures vivid colours during the day then at night it automatically switches out the IR filter to capture clear black and white images.
Using the IR-Cut filter lens and our proprietary adaptive compression technology allows the cameras to always deliver the very best images possible.
Another unique feature of our camera technology is the ability to drive two independent camera heads remotely via a high speed CAT5 network cable. This allows us to remotely monitor two different target objects that may be situated many meters apart with just 3G camera interface box.
The image on the right is our High Speed CAT5 interface going through some environmental testing.