CCTV Camera

Closed-circuit television camera or CCTV camera invented by can capture images or recording videos for surveillance. This kind of setup has made generally for monitoring behavior, activities, or other changing information for managing, controlling, or protecting people. This close observation from a distance usually used by private or Governments organizations for intelligence gathering, prevention of crime, the protection of a process, person, group or object, or the investigation of crime. These are useful for intelligence organizations and business firms to prevent serious crimes such robbery and kidnapping and collect information to optimize productivity.  

Based on sending signals to a storage device of the recorder, video CCTV cameras are categorized into two types such as analogue and digital. The captured data can also be recorded in to desktop computer or laptop computer.

This type of cameras passes analogue signals as pictures that must be recorded at slow speed continuously running tape. The usual rate would be four frames per second so that a three-hour tape can run for 24 hours. This whole process captures frame by frame that looks like snapshots and the blur image comes out. To avoid this flaw analogue signals can also be converted into a digital signal through video capture card installed into computer. Using an DVR in a computer recording can be stored as non-analogue media. These recorders are more compatible than PC based recording because it is built for this kind of solution, requires low maintenance and supports medium to large number of cameras.

This type of camera directly records using a digital signal which can be saved directly to a computer. Though the signal is compressed at 5:1 but DVD quality can be achieved through greater compression with slightly lower quality. Uncompressed video could quickly fill up the storage therefore sometimes motion detection can be used in case of uncompressed quality recording. Standard-definition video cameras are unable to cope up with 320,000 pixels, so they usually capture horizontal and vertical fields of lines and blend them together at the speed of 30 frames per second.

IP camera or Internet Protocol camera that transmit data through internet. This type of surveillance cameras only required of a local area network that can be accessed through that ethernet connection.  Many IP cameras need a central network video recorder (NVR) to manage video recording and alarm system. Other cameras can be operated decentralized manner with no NVR as it is capable to store on local or remote storage device. 

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