CCTV Terminology

Dome Camera PictureCCTV security camera terminology can be confusing.

Here are a few terms commonly used in the CCTV world to help you select your next security camera system.

Camera terminology:

CCTV – Closed-circuit television, also known as video surveillance refers to the use of electronically controlled cameras to transmit and record to a closed system of displays or monitors.

IP Camera – An Internet protocol camera, or IP camera, is a type of digital video camera commonly employed for surveillance, and which, unlike analog closed circuit television (CCTV) cameras, can send and receive data via a computer network and the Internet.

Mounting Bracket – A bracket used to secure cameras to the wall or ceiling.

Iris of a camera – The iris is an adjustable opening (aperture), which controls the amount of light coming through the lens (i.e. the “exposure”). The video camera iris works in basically the same way as a still camera iris — as you open the iris, more light comes in and the picture appears brighter.

Aperture – Iris controlled opening of the Lens.

Auto Iris – A lens that automatically detects how much light is entering the camera and adjusts accordingly. This is ideal for outdoor cameras where the lighting conditions fluctuate often.

Field of View – The maximum range that a camera’s lens can capture.

Focal Length – The length between the center of a lens and its focus.

IP Waterproof Rating – They are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc) and moisture.

Alarm Input – A wired input that can activate the camera if triggered.

Network terminology:

Power Over Ethernet – is a technology for wired Ethernet LANs (local area networks) that allows the electrical current necessary for the operation of each device to be carried by the data cables rather than by power cords.

IP Address – A unique address of numbers that identifies any network device using Internet Protocol to communicate over a network.

LAN – A local-area network (LAN) is a computer network of devices containing Ip Addresses. Most often, a LAN is confined to a single room, building or group of buildings, however, one LAN can be connected to other LANs over a network such as the Internet.

 

Video terminology:

FPS – FPS stands for frames per second, a measurement for how many unique consecutive images a camera can handle each second.

JPEG – “Joint Photographic Experts Group;” is a popular image file format. It is commonly used by digital cameras to store photos since it supports 224 or 16,777,216 colors. The format also supports varying levels of compression, which makes it ideal for web graphics.

Megapixel – A unit of measurement used to measure resolution. 1 megapixel is equal to 1 million pixels. The higher the pixels, the higher the resolution.