Night vision cameras offer a bit more than standard security cameras. The ability to see in low light to near darkness enables surveillance around the clock. While you may understand how this can help you feel safer at home, many businesses can also take advantage of these benefits. Here are some of the ways night vision cameras can be a great asset for restaurants.
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Burglars often like to creep in the dark night in hopes of being undetected. This is precisely why night vision security cameras are so important. But keep in mind that the value of night vision cameras is directly connected to their effectiveness and performance. To employ the best night vision surveillance system, keep these things in mind.
Remember that all IR CCTV cameras have a quoted maximum range. For example, these can range from 5m to 50m or longer. This range is the absolute maximum, meaning at these extremes, your image quality will not be its best. Measuring how far you need to see and then adding a third of that is recommended. For example, if you need to see 30m, it may be advised to invest in a 40m camera.
On the other hand, you don’t want the IR to be too powerful either. Most CCTV cameras cannot adjust the IR brightness, thus, if a subject is too close to a camera designed for long ranges, it will simply look too bright and/or washed out.
IR LEDS are designed to brightly illuminate the center of an image, therefore, most of these cameras will not have a very wide angle of view. While this is not a common problem, some cameras will have varifocal lenses that can zoom out. With these, be aware that at the wide end of the zoom, the corners of your image will not be covered by night vision.
For all security cameras, you want to be sure that the field of view is clear of obstructions, but this is especially important for IR CCTV cameras. If there is something like a branch or leaves in the frame, the LEDs will focus on these and they will be brightly lit. The rest of the image will be made darker in order to compensate, thus rendering the image is useless.
In order for night vision cameras to work, IR needs something to reflect off of. When users point a camera into an empty field, they may be alarmed when there is nothing but darkness and may assume the night vision is not working, but this is not the case. When a subject moves into range, the IR can reflect off of it, and thus, the subject will be visible.
Keep the height at which your cameras will be installed in mind when you are considering the power of your night vision. This is especially important when installing cameras above ground floor height. For example, if your car is parked 4m away from your house, and your camera is mounted 3m from the ground, the actual distance from camera to car is 5m.
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When it comes to securing the perimeter of your home or business, you want a surveillance system that can perform in various conditions. For 24-hour monitoring, night vision cameras have been the popular solution. However, the emergence of thermal cameras has provided a more advanced solution. Learn more about the different types of night vision cameras and how thermal cameras differ from them.
These are also known as day and night cameras and electronically and automatically adjust lighting capture settings based on the time of day to produce optimal video images. During the day, IR cut filters are used to “cut out” IR illumination, allowing for color images. At night, the filter is removed entirely to allow the maximum amount of visible and IR light to reach the sensor and produce a monochrome image. The downside to these cameras is that they are completely dependent on lighting conditions. That is, too much light or no light at all will result in unusable images. Thus, the amount of visible light available drastically affects the image.
IR cameras have a lens that is surrounded by LEDs which emit a beam of near-infrared energy to bounce off objects in its field of view. The image sensor is then able to create a picture; however, distance plays a crucial role in performance. Because the reflected IR light can only reach so far, these cameras are often limited to short-range applications.
Night Vision Cameras
Night vision goggles (NVG) and cameras capture visible light photons. As the photons penetrate a photocathode tube (which acts as an image intensifier), they are converted to amplified electrons that pass through a phosphorous screen and converts them back to visible light to create a picture (often in a greenish hue). Because these devices need just the right amount of visible light to function, they are virtually useless when there is ample light outside (ex. twilight) or in conditions where light is blocked (ex. smoke) or no light is available.
Rather than performing based on light availability, these cameras produce video surveillance images based on the measurement of the electromagnetic heat radiation emitted by all objects and individuals. Their performance is unaffected by bright lights, complete darkness, foliage, and light fog. No matter how small, differences in heat are picked up and produce images with high contrast, which are essential to the success of video analytics and intrusion detection. These cameras may be better suited for properties which require strict perimeter security (ex. oil and gas industries, data centers, mines, power stations), and are often combined with other layers of protection (ex. fence sensors, microwaves, PTZ cameras).
Thermal cameras also boast long-range detection capabilities, thus, reducing the number of cameras needed. They can also be a good substitute for fences where fence installation is not possible. For example, ports and oil refineries have acres of water and land to secure and monitor. Thermal imaging and video analytics can create “virtual fence” and can be a more feasible and affordable solution than installing a physical barrier.
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If you need help deciding which night vision or other security cameras will best suit your surveillance needs, please feel free to contact us at 888-203-6294 or visit SecurityCamExpert.com today!