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All About IP-surveillance


What Is an IP Cam?

IP-camera - is permanently mounted camera that has built-in IP-server, network interface and connects directly to the LAN / WAN / Internet. Many network cameras have the additional tools such as: motion detectors, sending messages by e-mail, work with your modem, the connection of external sensors, etc. Users can access the camera via a standard IP browser. Depending on your settings, access to the video, obtained by IP-camera can be opened to all network users or authorized users only.

How does the IP-Cam?

It consists primarily of a sensor. Very often, instead of the standard CCD-matrices for the video used the cheaper CMOS-sensors. Although they have lower sensitivity and is not too good color, its use can greatly reduce the cost of the device, because these sensors are all in a single chip with digital output data.
Next: part of a network camera includes a microprocessor for video compression and motion detection (or simply chip is a compressor). The most popular JPEG, as the easiest and least expensive, is often used as MPEG4, most rare and expensive is MPEG2. With the completion of the patent on arithmetic coding is gaining popularity WaveLet. Finally, in the network camera is 10/100 Mbps.

Principles of IP-cam:

Modern IP-camera is a digital device that produces video, digitize, compress and transmit video images over a computer network. How is the web-kameraPoetomu in the IP-camera includes the following components:

- CCD
- Lens
- An optical filter
- Video capture card
- Block compression (compression) video
- CPU and built-in IP-server
- RAM
- Flash Memory
- Network Interface
- Serial ports
- Alarm inputs / outputs

As a photodetector, in most IP-based cameras used CCD (CCD, CCD - Charge Coupled Device) - a rectangular photosensitive semiconductor plate with aspect ratio of 3:4, which converts the light falling on it into an electrical signal. CCD consists of a large number of photosensitive cells. In order to increase the light sensitivity of the CCD, often form a structure that creates the microlenses in front of each cell.

The technical parameters of the IP-camera usually indicate the format of the CCD (the length of the diagonal in inches), the number of effective pixels, the scan type (progressive or interlaced), and sensitivity. A typical IP-camera contains a lens, optical filter, a CCD array, a scheme of digital image processing, image compression scheme, and the IP server to connect to the network. Each network camera has its own IP-address, computer functions, software and firmware that allows it to function as an IP server, FTP server, FTP client and customer e-mail. Most modern network cameras include many other attractive features such as motion detection, alarm inputs / outputs and support for e-mail.

Advantages of network (IP)cam in front of camera-based PC

With built-in IP-server to transfer the received image over the network, the network camera does not need a direct connection to a computer or any other hardware or software.

Network Cam

The Cam - based PC
 Flexibility By placing the camera anywhere, You can connect it to the network using a modem, cell phone or wireless adapter. Sticky PC camera must be within 3 meters from the computer.
 Functionality All videos quickly transmitted over the network without any delays or additional hardware.  In addition to the camera you always need a computer and software.
 Installation You install only the IP-address and the camera is ready to work. Installing the drivers and software on the PC is complicated. 
 Easy to use You can manage and view images using the standard IP-browser on any PC. You'll need some software and you will be absent, the possibility of remote administration.
 Stability The cam works without any additional components, giving greater stability. In addition to the cam, the stability of its work depends on the stability of your computer and software.
 Quality High quality with the use of MJPEG.  Uses components of low quality, hence a small resolution.
 Cost The cost of the network camera is just the cost of network camera. The cost of the solution = Total cost camera + computer + software.


How to connect IP-cam on a local network?


You will need the following components: computer, switcher, network cameras, and LAN Ethernet. There are also options for wireless connectivity.

Step 1: Identify your needs

- Do you want to use the camera only indoors? Or for outdoor use?
- You want a camera with a fixed angle or variable, which allows you to remotely pan, tilt or zoom?
- You will need the extra options, such as motion detection, alarm notification, camera power over Ethernet, audio?
- You want to just watch, or also to record what is happening?
- You want to protect the camera from external influence?
- Determine how many cameras you need for your needs.

Step 2: System requirements

If your building has not yet laid a local network, which allows you to simply include a network camera in the network output, you'll need the following equipment:

- Switcher, which will serve as the central connection point between your network camera and your local computer
- At least two cable Ethernet: one to connect your network camera with a switcher and another to connect the local switcher with your computer.

Step 3: Installation

- Connect all devices to each other through the switch

Step 4: Assign IP address for the network camera.

- You must assign an IP address for your network camera so that you can access it via IP-browser on your local computer. You can choose between automatic and static address IP. Static IP address is recommended, because you do not have time to search every IP-address of the camera.

To install the IP-address of Network Camera. You can use the software on the CD-ROM that comes with the product, or can be downloaded from the manufacturer's website or by using the method of determining the protocol addressed the utility ping. In any case, all the information you find in the manual to Network Camera.

Step 5: Complete the installation of network cameras.

Once the IP address was assigned, you can open IP-browser on your local computer and enter in the address field of IP-address of the network camera. For new visitors to the IP-browser Internet Explorer, the browser will ask if you want to download the program to work with the camera. This program is mandatory in order to watch video from the operative video server or video. It also provides control for MPEG-2, MPEG-4, audio streams, motion detection and pan / tilt / zoom in the browser window. (Other IP-browsers may have native support for video streaming and do not require additional components.)

How to get access to IP-cam via the Internet?


Example: Once you get the picture already with IP-camera to your computer, you decide that it would be nice to be able to access the camera anywhere there is Internet access. For example, a shop owner, you want to control the actions of the store from your home, instead of having to attend every minute in the workplace.

Step 1: System requirements

A)
If your building (where the camera should be located) is connected via Ethernet to the Internet Service Providers (ISP), simply set up an account, include a network camera to the switcher via the network output, and you should get for your network camera dynamically assigned public IP address. Follow the installation teams for the network camera.

Special software or utility to an IP-camera will be useful in identifying the addresses of IP. As the designated IP address can be changed by your Internet service provider (due to limited supply of addresses IP, shared among its clients), learn how you can assign to a particular camera IP-address you will be able to Shage4 below.

B)
If your building is not equipped with access to Ethernet, in most cases, you may need the following items:

- Broadband connections for asymmetric digital subscriber line (usually supplied by your Internet service provider) or cable TV.

- Broadband Router, which can still be called the Internet Gateway (broadband router allows LAN users to share a single Internet connection. It also serves as an interface between Internet services and local area network.)

- Switch, which allows different devices from the network to communicate directly with each other and allows the devices from the LAN to have separate IP-address)

NOTE: Most broadband routers have a built-in Switch, so separate equipment is not required

- Network camera
- Local Computer
- A computer for remote monitoring

Step 2: Assign the IP-address for your cam

- Because a broadband router is typically assigned automatically, the local IP addresses for devices of local network IP addresses are properties change. Static (permanent) IP-address is recommended for network camera. To assign a static IP-address, find a range of IP-addresses of the router, which, for example, can range from 192.168.0.2 to 192.168.0.35.

If you want to use IP-address out of range, type 192.168.0.100, as a static IP address for the camera is likely that you will not risk that your device will conflict with other devices that receive automatic address. - Set the IP address for your camera can be done in three different ways, as described in the manual camera. Once the IP address assigned, set the subnet, and gateway (this information may be obtained from the router) and configure the camera settings: password registered users for restricting access to the camera.

Step 3: Port Readdressing

- Broadband Router, as mentioned earlier, provides an interface between Internet services and local area network. The router receives the external IP address from ISP and distributes the internal (local) IP-addresses for devices on the LAN.

To gain access to the network camera, constantly being in a local network, you must identify the external IP address of your router (see the manual of your router) and configure your router so that the external IP address was sent to a static local IP-address of Network Camera.

This process is called an open port, that is, when you type the external IP address of the router from any networked computer, the Internet determines the location of your router in turn forwards your request to the local address of IP, which is assigned to a network camera.

- Start the IP-browser and enter the built-in IP-router's page through the entrance to the pages of the router configuration.

- Find the menu item "Port Forwarding" (or similar), with the table around as shown below:

Service name Port start Port end Server IP address
FTP 21 21 Not Configured
HTTP (Network) 80 80 Not Configured
      Not Configured


Since the camera sends its video via HTTP, you must configure the HTTP service as follows:

Service name Port start Port end Server IP address
FTP 21 21 Not Configured
HTTP (Network) 80 80 192.168.0.100
Unofficial port 80xx 80xx 192.168.0.10x


- Save the configuration in the router and leave the configuration page. Configuration is done. Any requests that reach the external router's IP address on port 80 will now be sent to the IP address of the camera: 192.168.0.100.

- If you want to make accessible over the Internet more than one network camera, you should use additional (unofficial) ports in the router, such as 80xx and associate them with a network IP address of the camera.

Step 4: What can you do if your ISP changes often Dfi external IP address

- Create an entry in the DNS that serves and register domain names (eg http://www.webcamoff.com/, etc.) and attach it to the external IP-address, that is, each domain can set your network device ie its IP-address. Whenever the IP-address of the router will change, it will automatically be registered with the DNS, in order to update your IP-address so that you are at the same address have the opportunity to contact your network camera.

- Most broadband routers has native support for DNS, type http://www.dyndns.org/.

- Another alternative: You can buy or rent a static external IP-address from your ISP (Internet Service Provider).

How to use IP-based cameras to build IP-Surveillance system?


Effective way to enhance security systems in construction, factory, hospital or university campus is to use the existing infrastructure:

- During the day, the guards watching the monitor in the control room
- At night and on weekends, the observation can be executed remotely on a central monitoring point, serves a number of companies
- Built-in motion detection can trigger an alarm and start recording the alarm event
- In case of emergency, the head security officer can view the images on the closest to him udalennocherez PC or Internet connection.

Images can be stored in a computer in the enterprise or the server of your internet service (ISP). Storing images in a remote place of the provisions eliminates the risk that an intruder will destroy evidence of crimes. The cameras can also send images automatically host computer or host computer itself can retrieve images from the cameras.

If the main computer is running Windows, you can use special software designed for network cameras. The program can display the picture in real time, or work with archives. When the term storage of video images is, for example, two weeks, the program automatically deletes them.





                                                                                  

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