Posts Tagged ‘ wireless security cameras ’

USB CCTV Wireless Security Cameras

Saturday, May 29th, 2010

USB CCTV wireless security cameras are both affordable and easy to install which makes them an ideal choice for security and surveillance monitoring both in the home and at the office. USB CCTV wireless security cameras utilize a personal computer as part of the security system.

USB CCTV wireless security cameras is an abbreviation for Universal Serial Bus Closed Circuit Television wireless security cameras. These cameras do not require a coaxial cable for transmitting their video images to a processor or personal computer. This makes USB CCTV wireless security cameras an excellent choice for both the home and office, especially when cabling would look undesirable.

Wireless security cameras operate by sending their video data via on-board antennae. Most cameras utilize the 2.8 or 5.8 MHz radio spectrum band to transmit their data. Although transmission is via line of sight or LOS data can usually be easily transmitted through walls and other structures but with limited range. Line of sight means the range of transmission is based on the distance between the camera and the receiver with no blockages. In other words, the range given for the wireless camera is based on the length of line of sight between the two. If something blocks being able to see the receiver from the point of the USB CCTV security camera for example, the range could be reduced. Still these cameras have incredible range capabilities of several hundred feet.

Most wireless security camera systems have a receiver that transfers the cameras received signal to a processor or a capture board. The processor or capture board interprets the data sent to it by the receiver and creates a digital video file that can be viewed on a monitor and stored on a Digital Video Recorder or DVR. Often a CODEC or COmpression/DECompression software or circuitry is used to reduce the size of the digital video file while maintaining high video quality. In addition to the cameras and receivers, non-USB wireless security camera systems either require the additional purchase of a processor, monitor, and DVR or require some other connection method, often involving the addition of a special card, to a personal computer.

USB CCTV wireless security cameras utilize the USB port on a personal computer to connect to the computer. In addition, they normally come with software that processes the digital video signal and allows you to use your computer as the processor/CODEC device, monitor, and dvr storage unit. As you can see, this not only makes these systems easy to install, but reduces the cost by eliminating the expense of purchasing an additional processor, monitor, and DVR.

The computer monitor can be used to view the video, either live or from stored digital files. The DVR is just like the personal computer’s hard drive disk, so the computer’s hard drive can be used to store the files. If archiving or transferring the files is necessary, you can use your personal computer’s CD/DVD writer or USB flash drive to copy the files.

USB CCTV wireless security cameras provide video at the same resolutions available as stand alone units. Cameras normally capture video in full color under visible light conditions and in black and white or monochromatic under infrared light recording.

The cameras in this system use either a Charged Coupled Device or CCD or a Complimentary Metal-Oxide Semiconductor (CMOS) to capture the light transmitted through the lens into electrical energy. This energy can be interpreted and converted into high quality video. Due to modern technological advances, these sensors can be highly sensitive to light and produce images in very low light conditions. In addition, CCDs are inherently sensitive to near infrared radiation which makes them excellent for use as night vision infrared video cameras.

As you can see, USB CCTV wireless security cameras offer the versatility of using them just about anywhere and can be easily operated using a typical personal computer. In addition, there affordability makes them an excellent choice especially for home or residential use.


Wireless Security Cameras for Homes

Thursday, May 20th, 2010

Wireless security cameras for homes are becoming an incredibly popular and affordable option for security and surveillance monitoring. Wireless security cameras for homes offer several benefits and uses over conventional “wired” security cameras, and recent advances in technology have made them an affordable option for the average residential consumer.

Wireless security cameras for homes work basically in the same manner as “wired:” security cameras except they+ transmit their video images via radio waves in place of coaxial cables that are run from the security cameras to the processing unit. Although there are some wireless cameras that use rechargeable batteries as power supplies, most wireless cameras still require that a wire from the power source be connected to the camera.

Wireless cameras are available in many types and sizes with a variety of functions. Wireless security cameras for homes can be separated into two major categories based on where they are used. Outdoor cameras are usually weatherproof and may be installed just about anywhere outside of the home. They are often used for perimeter monitoring, monitoring driveways, gates, and other entries and exits as well as stand alone buildings like sheds, garages, and barns. Indoor security cameras do not offer the same protection from the elements as outdoor security cameras and are designed for use within the home. Wireless security cameras for homes that are used indoors are often used as security monitoring devices for each room; night or daytime surveillance cameras such as baby monitors or for providing monitoring care for non-ambulatory individuals,

Wireless security cameras for homes have several standard and optional features. Security cameras can be night/day type cameras or day/night vision cameras. Wireless cameras that are called day/night cameras have a very sensitive electronic imaging chip called a Charged Coupled Device or CCD. These cameras can produce very vivid, high quality video in full daylight conditions and in environments with very little available light (such as moonlit nights). They must have some visible light in order to produce an image.

As an alternative to day/night wireless security cameras for homes, wireless night vision cameras can be used. These cameras are able to see infrared (IR) light, which is invisible to the human eye. These cameras produce very vivid, high quality colored video with visible light present and very vivid, high quality monochromatic or black and white video under infrared conditions. Wireless IR cameras have an array of IR Light Emitting Diodes or LEDs that surround the camera lens. These LEDs emit IR light that is invisible to the human eye but lights up the desired target area much like a spotlight for the IR camera. These cameras are particularly useful for monitoring outdoors at night or indoors in dark rooms.
Wireless security cameras for homes have several other features available as well. Cameras can utilize pan, tilt, and zoom features both manually and automatically to move the camera in order to track movement or change the field of view. Most wireless cameras also come with sound monitoring so that audio may be recorded as well as video.

Another useful feature for wireless security cameras for homes is the ability to utilize IP networking. IP networking or Internet Protocol networking allows the cameras’ images to be viewed over the internet, making monitoring accessibility available anywhere internet is available. This is incredibly convenient for individuals that may want to check on their homes while at work or when on travel. In addition, IP networking provides a method for easy networking to security monitoring companies should you the home owner desire to have their video monitored by a 24/7 monitoring service.

A typical home wireless security camera system includes the wireless cameras, the receiver unit and processor, monitor and digital video recorder or DVR. Many wireless security camera systems can also be utilized using a personal computer in place of the processor, and DVR making the system even more affordable.

Wireless security cameras for homes can provide you with comfort and piece of mind of knowing what is occurring at your residence at anytime, anywhere, and on any day. Their wide variety of features makes them useful for just about any residential application.


Wireless Security Cameras with Computer Monitor

Monday, May 17th, 2010

Wireless security cameras with computer monitor provide excellent security and surveillance for both businesses and residents alike. A wireless security camera system set up with a computer monitor can provide live real-time monitoring of any area, indoors or outdoors in well lit areas or at night.

Wireless security cameras with a computer monitor can be used just about anywhere. A wireless security camera transmits it video images using either the 2.8 or 5.8 KHz frequencies to a receiver that is tuned to the same channel. The receiver then passes the signal on to the processor or a personal computer.

The advantage of using a wireless security camera is that no cabling is required for transmission of data. This has several beneficial implications. First, installation is much simpler and faster. Second, security cameras can be placed in areas that might otherwise be impractical. Third, security cameras can be located in positions that are relatively remote from the processor, digital video recorder or DVR, or personal computer.

Wireless security cameras can be used with personal computers to complete the security system. If this is the case, a computer monitor is ideal for viewing wireless camera transmissions or for playing back recorded data. In this case, the computer becomes the processor and the DVR but a good quality, high resolution monitor is still needed to view the security camera transmissions in real time.

Contemporary computer monitors are typically Liquid Crystal Display or LCD types with very high resolution capabilities. Security system computer monitors usually provide a variety of connection inputs including composite, S-video, component, and personal computer capabilities. Their response times are normally very fast (for example 16ms) which allows for high quality display of multiple video feeds. Computer monitors for security systems often have an amplifier and speakers built right in to the monitor so that audio may be heard as well.

Of all the components of a security/surveillance camera system, the monitor is probably used the most. The greatest advantage to Closed Circuit Television or CCTV cameras is the ability to view the target area in real time; live. For this reason you should choose your wireless security camera system’s monitor carefully. Be certain that it has a high enough resolution display to be able to display all of your cameras’ feeds simultaneously with good clarity and quality.

There are many uses for wireless security cameras with computer monitor. One very popular application for a wireless security camera with computer monitor is in a nursery or baby’s room. These systems allow you to monitor your baby any time day or night by using spot monitors or a central computer monitor.
Another popular application of a wireless security camera system with computer monitor is for monitoring the entering and exit of customers into and out of various business locations. Wireless cameras can easily be installed in lobbies and vestibules where entrance and exit doors are located. Real-time monitoring of every individual that enters and leaves the premises can be accomplished with relative ease.


Wireless Night Vision Outdoor Security Cameras

Wednesday, May 12th, 2010

Wireless night vision outdoor security cameras are an excellent choice in providing security and surveillance monitoring for both businesses and residential areas alike. Recent advanced technologies in security camera manufacturing have yielded a high quality product with many interesting features at an affordable cost. Let’s take a look at some of the features available for wireless night vision outdoor security cameras and how they function.

Before we talk about wireless night vision outdoor security cameras we need to clarify or make the distinction between what is meant by a “night vision” camera and a day/night camera. Inside the camera is an electronic sensor called a Charged Coupled Device or CCD. Occasionally another electronic device called a Complimentary Metal-Oxide-Semiconductor or CMOS is used instead of a CCD. Both the CCD’s and the CMOS’s purpose is to convert light into electrons that can be monitored or manipulated to create digital images. Each device has its own set of benefits and detriments, but most security cameras employ the use of a CCD, especially when images are required when there is little or no available visible light.

This is true because CCDs can be manufactured that are very sensitive to light; so sensitive in fact that they can produce images from as little light intensity as that available on a moonless night in clear air, which is approximately 0.002 LUX. LUX is a unit that is used to indicate light intensity. A full moon on a clear night in geographical areas outside of the tropics produces light intensity of approximately 0.27 LUX. By contrast, full daylight that is not direct sun light produces 10,000 to 25,000 LUX. Cameras made with these sensitive CCDs are normally called day/night cameras, not night vision cameras. These cameras are designed to produce images in conditions with very little light (very low LUX), but cannot produce images in total darkness. Security cameras that can produce images in total darkness are called night vision or infrared security cameras.

Interestingly, the CCD sensor chip that is used to capture images from visible light is also inherently able to capture images made from infrared (IR) light. Infrared (IR) light is often thought of as the images produced by thermal radiation of objects, however, security cameras utilize what is called the near infrared spectrum. This light is in the 0.7 to 1.0 micrometer wavelength range and is invisible to the human eye. However, wireless night vision outdoor security cameras can “see” this light just like visible daylight and are therefore able to produce high quality images from it. The only difference is that the images produced are monochromatic or “black and white.”

How do wireless night vision outdoor security cameras illuminate their target area? Night vision security cameras normally have a series of infrared light emitting diodes or IR LEDs that are placed around the outside of the camera lens. These LEDs produce light, but only IR light in the near infrared spectrum; the exact light that the CCDs are inherently sensitive to. Therefore, to wireless night vision outdoor security cameras these LEDs in essence produce a spotlight that shines on the target area and illuminates it for the camera while at the same time the human eye is unable to detect the presence of any illumination. Generally, the more LEDs that surround the camera lens, the further the range of the IR camera, to a point. Premium night vision cameras can have effective ranges of up to 300 feet. It’s important to know what distances you will want to cover with your wireless night vision outdoor security cameras so that you can purchase a camera with an effective range.

Wireless night vision outdoor security cameras still require some wiring. When referring to a “wireless” camera, it usually means the camera transmit its images to a receiver using radio waves. This eliminates the need for coaxial cable to be run from each camera to the processor. However, the cameras still require wiring that provides them with the necessary power to operate.

Wireless night vision outdoor security cameras come with a variety of features and accessories. Cameras can pan, tilt, and zoom; they can record not only video but also audio; and they come in a variety of sizes, shapes, and types as well. In addition the system can be networked and viewed anywhere there is internet access.

Few security systems can offer the peace of mind as the constant monitoring provided by wireless night vision outdoor security cameras.


How To Install Security Cameras Without Cables

Sunday, February 21st, 2010

Deciding on the right security camera system for your home or business is definitely an important decision. Another important decision is how you will be installing your surveillance system. Will you be using COAX cable, twisted pairs, or maybe even no cables at all? Sure, the thought of a wireless security camera system conjures up images of the easy life. It seems that everyone would have security cameras if they could all be installed without wires. So, why aren’t all surveillance systems wireless?

It would simply be much easier to install your security cameras if there was no worry about wires, but the truth is that wireless security cameras are not as dependable as wired cameras. Sometimes wireless cannot be avoided and in those cases there are some dependable solutions. First, I recommend you do everything possible to avoid wireless security cameras. Make sure to consider all of your options. If there is just no other way, then it is time to look at wireless options. There are basically two main forms of unlicensed wireless technologies that can be used with security cameras.

Analog wireless is one solution. This technology usually works in the 900mhz, 2.4ghz and 5.8ghz  bandwidth. These wireless bandwidths are prone to interference from many of today’s household appliances such as microwaves, wireless phones etc.. In general, unless there is direct line of site, there is a very limited distance for the receiver and transmitter to work correctly. However, if you can get a direct line of site without any obstacles between the transmitter and receiver this solution can work. To use this solution, you will simply mount the cameras, connect the video output to the video input of  the wireless transmitter, then if mounted outdoors, place the transmitter in a weatherproof junction box. Next, mount the wireless receiver so that it has direct line of site to the transmitter and connect the video output to the cable and run your cable directly to the video input on the back of the DVR. With this set up you can usually run quite long distances depending on the amperage of your wireless transmitter.

The next option is to use standard wireless Ethernet. This uses the 802.xx B,G,N bandwidths. With this option you can usually get longer distances without line of site and since many homes and business already have a wireless internet network, this solution should easily fit in. This is not the cheapest solution, but it will be more reliable in most cases.  Using this solution with a digital security camera system is a little different to set up. Let’s assume that you are installing the system in your home and you cannot get cables run between the floors. Basically, you will set up 2 DVRs. The first DVR will go upstairs. It really doesn’t matter where. Just place it somewhere most convenient for all the upstairs cables. Now install all your upstairs cameras as you normally would and the connect the DVR to a wireless access point. This access point will be configured to connect to your wireless network. Now, you will set up your downstairs DVR and connect it to all your cameras downstairs. Next, connect this DVR to a wireless access point or just plug it into your network. Now, install the client software on any PC in your home and configure the software to connect to both DVRs. Now, from this PC, or any other PC where you install the client software, you can connect to both DVRs at the same time, basically as if they were one system. The client software will allow you to do all functions of the DVR. You can view live video, recorded video, download video, configure your DVR and more all remotely.