PC based video surveillance systems

Computer-based digital system consists of computer capture card (cards) built-in the computer and client software. This type of system is considered the best solution for the price. It gives at least two times better quality than analog, easy to use and more flexible than the hardware DVR systems. Components can be bought in kit to be installed in an existing computer, or as pre-made system for recording. Factory models exist that can be expanded (upgrade) later. This is a feature that is not present in analog and hardware-based systems.
According to the operating system, computer based systems are divided in Windows and Linux based. They are programmed and managed with a keyboard and mouse. Video information is stored on the hard disk in compressed format, which is a prerequisite for longer storage of information.
Computer-based systems are made for configurations with 1 to 16 cameras, but recently it is possible to mount a second capture PC card, which increases the practical possibility to connect up to 32 cameras to one computer. These systems are designed so that they do not require maintenance of the stored video information. Usually, they continued recording until it runs out of disk space. Then the system automatically deletes the oldest recordings and thus ensure the continuity of records. Time which will be stored records depends on several factors - the quality of the recording, type of compression, the number of frames per second, and the size of disk space. If necessary to increase the duration of retention of information, the easiest way is by adding more disk space. To increase the period of storage of records there is a possibility of reducing the quality of records, reducing color recording, reducing the number of frames per second, etc.
Video images are displayed on the monitor also can be saved to Flash memory or CDs. Some of the systems stores information so that later it is possible to reproduce it at every single computer. Also possible to record images from a single frame and to print. With this type of system you can play any combination of cameras without having to pause the recording process. Most modern systems offer the following options:

1. Record on motion detection.
2. Possibility to connect to LAN networks and the Internet.
3. Play many cameras.
4. Remote viewing of live events and recordings.
5. Watching with alarm.
6. Adjust speed.
7. PTZ control
8. Digital zoom lens.
9. Printing photos from a frame.
10. Setting up the digital images.
11. All Search Options
12. Adjust the speed of the frames.
13. Password protection.
14. Record audio.

ADVANTAGES:
1. Up to 720 * 576 pixels digital video recording.
2. Use is easy and flexible.
3. Save time with video playback.
4. Stored information or a video recording days.
5. Require little or no maintenance.
6. Easily connect to a network.

RESTRICTIONS:
1. Systems work on a computer running Windows or Linux, are therefore stable as stable is the operating system.