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  2. Hidden camera - Wikipedia

    en.wikipedia.org/wiki/Hidden_camera

    A hidden camera can be wired or wireless.Hidden cameras are connected, by cable or wirelessly, to a viewing or recording device, such as a television, computer, videocassette recorder, network video recorder, digital video recorder, memory card, or another data storage medium.

  3. Home security - Wikipedia

    en.wikipedia.org/wiki/Home_security

    Current cameras feature abilities such as motion detection and two-way audio, allowing users to receive notifications of activity and speak and listen through the camera. Home surveillance cameras used for security purposes have become more accessible, but have sparked security concerns from consumers.

  4. Secret photography - Wikipedia

    en.wikipedia.org/wiki/Secret_photography

    Erich Salomon took images of European summit meetings and a session of the US Supreme Court in secret using an Ermanox camera hidden in his hat. Some classic early U.S. street photography – such as that of Paul Strand on the Lower East Side [2] – was obtained by fixing a second "dummy lens" to the camera, whereas the real shot was taken ...

  5. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    Fixed cameras' resolution typically does not exceed 20 megapixels. The main feature of a PTZ is its remote directional and optical zoom capability. With multi-sensor cameras, wider areas can be monitored. Industrial video surveillance systems use network video recorders to support IP cameras. These devices are responsible for the recording ...

  6. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    The recording device was concealed on a person Thatcher had previously approached for help in the crime. [citation needed] Electronic bugging devices were found in March 2003 at offices used by French and German delegations at the European Union headquarters in Brussels. Devices were also discovered at offices used by other delegations.

  7. Closed-circuit television camera - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television...

    These cameras do not require a video capture card because they work using a digital signal which can be saved directly to a computer. The signal is compressed 5:1, but DVD quality can be achieved with more compression (MPEG-2 is standard for DVD-video, and has a higher compression ratio than 5:1, with a slightly lower video quality than 5:1 at best, and is adjustable for the amount of space to ...

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