Hidden camera
The camera may be "hidden" because it is not visible to the subject being filmed, or is disguised as another object. Such a camera may not be visible to the subject, for example, because it is fitted with a long-focus lens and located beyond the view of the subject, or located, say, behind a two-way mirror. Hidden cameras can be built into commonly used objects such as television sets, smoke detectors, clock radios, motion detectors, ball caps, plants, and mobile phones. Hidden cameras may be used for household surveillance and may also be used commercially or industrially as security cameras. The proliferation and lower costs of video recording devices have led to an increase in the use of hidden cameras for legitimate surveillance need, as well as for entertainment and other purposes.
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