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  3. Wireless security camera - Wikipedia

    en.wikipedia.org/wiki/Wireless_security_camera

    Analog wireless is found in three frequencies: 900 MHz, 2.4 GHz, and 5.8 GHz. Currently, the majority of wireless security cameras operate on the 2.4 GHz frequency. Most household routers, cordless phones, video game controllers, and microwaves operate on the 2.4 GHz frequency and may cause interference with a wireless security camera.

  4. Mobile phone use in schools - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_use_in_schools

    Mobile phones with cameras are restricted within school premises while entirely banned within certain sections such as changing rooms, bathrooms, gyms and swimming pools. They are only allowed to film or take photographs of people only with their signed permission or, if the person is under eighteen, [ 20 ] to have a parent or guardian to give ...

  5. Document camera - Wikipedia

    en.wikipedia.org/wiki/Document_camera

    A progressive scan camera captures all scan lines at the same time, whereas an interlaced camera uses alternating sets of lines. Image sensors provide only monochrome images. With a 1-chip camera, color information can be obtained through the use of color filters over each pixel. With 1-chip cameras, the Bayer filter is very commonly used. Red ...

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  8. 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 ...

  9. ‘Huge invasion of privacy’: KCK teachers denounce adding ...

    www.aol.com/news/huge-invasion-privacy-kck...

    “Teachers under audio and video scrutiny are not the answer. I spoke with several teachers, and we do not want to teach in a fishbowl.”

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