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  2. Wallpaper (computing) - Wikipedia

    en.wikipedia.org/wiki/Wallpaper_(computing)

    A computer screen showing a background wallpaper photo of the Palace of Versailles. A wallpaper or background (also known as a desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, smartphone or other electronic device.

  3. 4K resolution - Wikipedia

    en.wikipedia.org/wiki/4K_resolution

    The terms "4K" and "Ultra HD" are used more widely in marketing than "2160p". While typically referring to motion pictures, some digital camera vendors have used the term "4K photo" for still photographs, making it appear like an especially high resolution even though 3840×2160 pixels equal approximately 8.3 megapixels, which is not considered ...

  4. Ultra-high-definition television - Wikipedia

    en.wikipedia.org/wiki/Ultra-high-definition...

    On July 3, 2013, Sony announced the release of their 4K Ultra HD Media Player with a price of US$7.99 for rentals and US$29.99 for purchases. [137] [138] The 4K Ultra HD Media Player only worked with Sony's 4K Ultra HD TVs. [138] On July 15, 2013, the CTA published CTA-861-F, a standard that applies to interfaces such as DVI, HDMI, and LVDS. [139]

  5. Drowning detection system - Wikipedia

    en.wikipedia.org/wiki/Drowning_detection_system

    Passive system underwater cameras let lifeguards inspect multiple underwater views simultaneously from a single location. [ 6 ] [ 7 ] Cameras can cover areas which may otherwise be obstructed. Below water cameras can be paired with above water cameras to provide face-to-body matching if there is an incident where a swimmer needs to be ...

  6. 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.

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