How Night Vision Cameras Work?

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Night Vision Camera

You might have come across night vision cameras many times and might have thought about how it functions. If explained in lay man’s language, the black and green or black and white footage that you might have seen in various TV shows showing paranormal activities or ghost hunting. The cameras having night vision technology which enables them to capture in dark are called night vision cameras.

Night vision technology works with three different methods those are low light imaging, thermal imaging and infrared illumination method.

Low Light Imaging

Low light imaging cameras functions on image intensifiers. An amplified image is produced by the intensifiers by enlarging the available light. When the light object focuses on photocathode then the light intensifying effect is produced. The image is created when electrons strike on the phosphor screen. During low light situations a clear image is created by intensified cameras systems using intensifiers. This creates a broader image of the scene present in low light area and enables us to view it. To capture the footage or image these cameras need some available light. However the images produced by these cameras in low light are excellent, these are able to identify the people in low light scenes. These are available in the affordable prices and are a popular choice as home security cameras.

Thermal Imaging

This technology works on the principle that infrared energy is produced by the object because of its temperature. Such type of cameras does not need any light to record an image. The more the temperature is, the more the emission of infrared radiations it will be. Thermal image is produced by Infrared energy. The produced thermal images look black when emitted by a cold object and are white when the hot object is there. There are certain thermal cameras which can produce the colour images. These cameras are capable of capturing the objects at a great distance. These cameras have higher level of thermal sensitivity. They do not require any light source.

Infrared Illumination

Infrared illumination along with the motion detection technology produces image for these cameras. It functions by detecting the movement of the object then the infrared illumination lit up the scene and records the images. Infrared illumination functions with LED lights and produces images in black and white, which are high quality images. In addition with motion detectors and no requirement for any light source they highly efficient and produces excellent monitoring.

How Motion Detecting Security Cameras Work?

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CCTV camera motion sensor

Motion detection camera is one of the most popular security devices in these days. It is actually a very smart and effective way to ensure a tight security in and around the target area. Having the basic knowledge of the technology being used under the hood would be quite helpful in making the best out of this efficient device.

Generally there are two types of sensors used in the motion detection cameras – CCD and CMOS. The former is more powerful and can work even in poorly lit areas. Naturally they are much costlier when compared to CMOS which is less efficient and hence come in a relatively lower price range.

Simply speaking a motion detection camera actually compares each captured image to the preceding one (a video clip being a series of countless successive images) and detects significant changes between them if any.  And in case it finds such changes it interprets that change and triggers the alarm. Now there can be two types of changes – first, an overall change in the image which generally occur when there is noticeable variation in the light condition for example a light is switched on or off or sunlight suddenly enters the place.  Second is the focused changes which mainly happens as a result of noticeable motion in the images for instance when a person passes through the area which is under surveillance by the camera.

You can also adjust the sensitivity of the camera in accordance with your requirement so that it only notifies the nature of changes as instructed by you. In fact today’s motion detection technology is extremely advanced which can distinguish between delicate differences determine very efficiently when to trigger the alarm. The high end motion detection cameras offer you extreme control over the motion detection setting so that you can fine tune the condition under which the alarm will trigger. For example you can adjust the brightness in such a way so that the alarm will not activate when there are some movements of shadows in the area. You can also preset the size and the pace of the object that would trigger the alarm. This helps the device differentiate between the movements of a small animal (say for example a cat or a rat) and a man. Again you can specify areas where to overlook the changes in motion for example the area which has trees with frequently moving leaves.

All these advanced fine tuning features cut down the chances of a false alarm to a great extent and keep the volume of the recorded video to a minimum at the same time. And what you get as an output is a seamlessly accurate security system because you will surely not like to wake up at the middle of your sleep because a fat mouse has entered the warehouse at the midnight. Moreover the technicians who install the camera are expert enough to set the camera in such a location and angle which would reduce the possibility of false alarms which are sometimes triggered by deceiving conditions.

Home Surveillance Cameras Types and Features To Look For Before Buying

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Surveillance Camera Types And Features

With considerable price-drop over a decade the use of home surveillance cameras are not limited within the elite class anymore. Today anyone willing to keep their home and family under an effective surveillance can opt for these devices. It is in fact an excellent and efficient way to secure your property and near and dear ones. But before finalizing the purchase decision there are several things to know about these wonderful devices.

Types of Surveillance Systems

Indoor Surveillance: These systems are mainly used for the purposes such as keeping an eye on the babysitters, servants or any other workers staying inside the house for professional purposes. You can monitor a particular room, several rooms or a specific work area.

Outdoor Surveillance: These are meant for catching intruders or criminals attempting to break in your house. These cameras are generally weatherproof to withstand the harsh effects of the nature.

 Types of Camera

You can choose from several available options depending on your specific requirement.

Dome: This type of cameras is mounted onto a ceiling through three axis points. It offers only a linear view as it cannot change the viewing field easily. However it can be controlled remotely to zoom, pan and tilt the view.

Bullet: It is the most typical and familiar camera which we often notice in many places. It is relatively larger and meant for outdoor use. It can turn around to offer a wider view of the area.

Wireless: This is the most popular choice at present as there is no wiring botheration associated with it. To use it just plug and play.

Hidden: It is very inconspicuous in nature and is intended for discrete filming. It is made to look something else (and not a camera) for the very obvious reason.

Home surveillance Camera Features

Black & White vs. Color: In many cases color feature is not essential for domestic surveillance purposes. However you can go for the color option if budget is not a constraint for you. But you should choose a camera which can produce quality image even in black and white because grainy pictures won’t be helpful in identifying intruders. In addition it should also possess night vision abilities.

Resolution: As in any camera resolution is a big factor to achieve quality. A standard home surveillance camera generally features 350 to 400 TVL of resolution. High resolution surveillance camera come with 480 to 800 TVL and offer superior quality image. However they are not essential in most cases.

Wireless vs. Wired: Both have advantages and disadvantages of their own. Wireless cameras are more flexible and discrete. They can be installed wherever desired. And the disadvantage is that interruptions in wireless internet connectivity can affect the surveillance process.

Coverage: The amount of area covered by the camera can largely vary. Some cameras can only shoot the frontal area whereas the wide-angle lenses with zoom, pan and tilt functions cover a larger periphery. So choose it wisely depending on your requirement.

Captured Video Storage: You need a storage device to retain the captured video to be used for future reference. Now with advancement in technology hours of digital footage can easily be stored and retained. Here you have a couple of options to choose from. First is the DVR recorder which makes use of hard disk and a 750 GB hard drive can hold videos recorded for 50 to 60 days. And therefore there is no concern for storing capacity as used to be in earlier days. Next is the IP which connects to the internet system to access the camera.

So based on all these features and criteria you can now decide which type of surveillance camera will be ideal for your specific requirement.