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Term - W


Wide Area Network.

Wavelet :

A mathematical function useful in digital signal processing and image compression. In the Internet communications, wavelet has been used to compress images to a greater extent than is generally possible with other methods such as JPEG or MPEG.

Web Camera (or Web Camera Server) :

A CCTV Camera with built-in web server computer.

Web Server :

The computer program (housed in a computer) that serves requested HTML pages or files.

Wide Dynamic Range (WDR) :

The ability of a camera to compensate with multiple levels of light for the back light behind an object.

Wiegand Card :

An access control card based on the Wiegand effect. Small bits of specially processed wire are embedded in the card in a pattern that uniquely identifies the card. This identification information can then be decoded by a Wiegand reader.

Wiegand Compatible Devices :

A propriatary coding format for information used by many of the suppliers of cards, key tags, proximity readers, magnetic stripe readers, bar code readers, and related items.

Wiegand Effect :

Electrical pulses generated when individual sections of specially processed magnetic wire is passed by a pickup coil. Each section of this magnetic wire has its own magnetic field. Depending upon the strength of the individual magnetic fields, the pickup coil either senses a strong field or overpowers a weak field, which generates an electrical pulse.

Wiegand Reader :

A reader capable of reading the information encoded on a Wiegand card.

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