Looking to do a little ghost hunting? In the mood to re-enact your favorite scene from “Predator”? Whatever your pleasure — from security to nature-watching to artistic expression — there’s a night-vision camera for you.
Nighttime photographers entered the picture in 1871, when Richard L. Maddox developed a photographic plate that was finally up to the task. Early photographers captured images on wet plates — panes of glass coated with chemicals — which were touchy and cumbersome and required exposure times that made night photography impractical. Maddox’s gelatin dry plate changed all that, becoming the first medium capable of capturing nocturnal cityscapes [sources: Encyclopaedia Britannica; Schwendener].
As time passed and interest spread, legendary photographers such as Alfred Stieglitz, George Brassaï, Weegee and Diane Arbus brought better cameras, improved film and special development techniques to bear. These famed photogs peeled back the curtain of night not with night vision, but with the glow of city lights, illuminated signs, moonlight and the occasional flashbulb.
By the 1970s, Japanese photographers such as Kohei Yoshiyuki were stalking city parks at night, capturing voyeuristic tableaux with their infrared (IR) film and filtered flashbulbs. The era of true night-vision image capture had begun, and both criminals and young lovers would never be safe again [source: Schwendener].
From World War II to today, the U.S. armed forces have driven night-vision tech. As the military turns out incrementally better night-vision scopes, the technology finds its way into civilian cameras. Most prominently, closed-circuit security grew from its infancy in the 1970s to become commonplace by the 1990s [sources: Demetriadi; National Archives; Roberts].
Today, night vision is most widely available in security cameras. Some work only at night, while others switch modes based on user input or ambient light. Surveillance rigs can run from $18 for a 0.5-lux low-light camera to $3,670 for a top-of-the-line thermal imaging model (lux measures the minimum light a camera needs to pick up an image, so lower = better) [source: Brickhouse].
Out-of-the-box night-vision photography cameras are rare. The Midnight Shot NV-1, a dual-mode, digital color/IR camera offered through ThinkGeek for $99.99-$149.99, was the only exception we could find in 2012. In most cases, photographers turn instead to IR film, IR lights and special filters, or hack their digital cameras to capture IR (more on that later). Night-vision adapters for photographic and video cameras offer a simpler approach, but will set you back a cool $6,840-$10,819. Thermal imaging cameras, such as the FLIR T series, break the bank at $8,450-$14,294.
Whatever your shopping selection, your camera will use one of two basic approaches to see in the dark: It will either amplify dim visible light, such as the ambient nightglow of the moon and stars, or gather electromagnetic radiation types that humans can’t perceive, such as infrared.
It makes sense that we would end up taking these two approaches; after all, that’s how Mother Nature does it.
@craigelloyd
February 9, 2017, 6:40am EDT
Most security cameras come with night vision, which allow them to still see things even if it’s pitch black outside. But how does it work?
If you don’t know what we’re talking about, then you’ve probably at least seen night vision footage from those ghost-hunting TV shows—that black and white or black and green look is all too familiar. Many security cameras also include that same night vision technology, allowing them to capture footage even when it’s dark out.
Infrared Night Vision Bathes The Area in Light That’s Invisible to Our Eyes
There are a couple different types of night vision: One that most security cameras use, and one that night-vision goggles use. The most common type that’s used on most security cameras is infrared (IR) night vision, which relies on infrared light.
If you’ve ever looked at the front of a security camera, you’ve probably noticed that it’s covered in a handful of small LED bulbs. This is the IR light, and when it gets dark out, these lights turn on and act as a flood light of sorts, dousing the camera’s field of view with infrared light.
The thing is, infrared light is completely invisible to the naked eye. So it doesn’t look like a bright light is flooding the area from the outside, but it actually is—your eyes just can’t see it.
Furthermore, night vision footage from security cameras always looks black and white because human eyes can differentiate between black and white better than they can with other shades of colors, like red or blue. Because of that, most night vision cameras switch to a monochrome filter to make it easier for us to see the image.
There are many different types of light that we can see with our eyes, but infrared (IR) light is invisible to the naked eye.
Most security cameras that have night vision capabilities, including the Nest Cam, also have what’s called an IR cut filter. This automatically detects daylight and applies the filter to block out the IR light during the day in order to keep colors looking accurate. When nighttime arrives, the filter automatically gets removed, which lets more light in, including the IR light coming from the camera.
Placing a night vision camera near a window will result in the IR lights reflecting off the glass.
Intensifier Tubes Absorb Whatever Light They Can, and Amplify It
There’s also another type of night vision, and it’s more often found in night-vision goggles which contain something called “intensifier tubes.” In the most basic of terms, it involves using an extremely sensitive camera sensor that cranks up the intensity.
In more advanced terms, the available light that enters night-vision goggles (consisting of photons) gets turned into electrons, converting the light into an electronic signal of sorts. The electrons are then multiplied using a photomultiplier and then pass through a phosphor screen, which creates flashes of light that results in a brighter image.
All of the colors of light that enter the goggles are converted to a shade of green after they go through the phosphor screen, which provides that iconic look that you’re likely familiar with—human eyes are much more sensitive to green than most other colors.
Night vision goggles are possible because it’s never truly pitch black outside—it’s just very, very dark. In fact, it’s very difficult to block out all light unless you’re actively trying to do so. Night-vision goggles can take the little light coming from the moon or street lights and amplify it.
A regular camera can do something similar. Go into a dark room in your house (or go outside at night) and take a long-exposure picture using a camera (if it’s capable of taking long-exposure shots). The resulting image will be much brighter than what you actually see, since the camera is taking all the available light there is and amplifying it. If there was absolutely no light available, the camera wouldn’t be able to capture anything, no matter the exposure.
Again, though, this type of night vision is usually only found in night-vision goggles, and most security cameras that come with night vision capabilities rely on IR light, which is much cheaper to implement and gives you better image quality overall.
When it comes to your family’s safety and security, you don’t want to leave yourself vulnerable. Although most burglaries occur during the day, nighttime burglaries are almost just as common—so a top-notch security system should have you covered around the clock. And a camera is only effective if it can see the perpetrator and provide a clear record of the crime that occurred. That’s where a night vision security system comes in.
How does night vision work?
While traditional cameras use visible light to capture and record images, night vision cameras work by recording infrared radiation, which is a form of energy associated with heat. The warmer an object is, the more infrared radiation it gives off. This type of radiation is independent of light, so cameras that can detect it can record images even in complete darkness. Because humans naturally produce body heat and household objects do not, an intruder will show up clearly among the objects inside and outside your home.
Why night vision is important for home security
A large percentage of crimes occur at night when people are sleeping and criminals are harder to see. While traditional cameras offer a measure of security, they simply can’t protect you fully at night. Night vision offers the chance to detect criminals and activate other safety features of your system when you’re asleep and at your most vulnerable.
Night vision cameras, like those that are a part of a full home security system from Xfinity Home, work hand-in-hand with a smart system.
Xfinity Home also provides 24/7 Professional Monitoring services, so the authorities will be notified when an alarm is triggered. If you leave the house empty overnight or for an extended vacation, an outdoor night vision camera can detect activity when your neighbors can’t. So, you’ll know that help is on the way.
Xfinity Home offers indoor/outdoor cameras with night vision and other high-quality features. Build your security system so that it protects you day and night.
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A night vision camera is a camera which has the recording capacity to record something even during nights. The working of a night vision camera is based on several methods that it brings in use to process pictures. This includes the usage of reflected light to produce images or to detect heat in an object to produce images.
These kinds of cameras are bought in use for wildlife photography, hunting, fishing, security purposes etc. Such cameras were highly expensive earlier, but the websites of online shopping like E-bay and Flipkart etc have made these cameras cheaper and handy. Let us discuss the working of these cameras in briefly today.
