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  2. Metamaterial cloaking - Wikipedia

    en.wikipedia.org/wiki/Metamaterial_cloaking

    Metamaterial cloaking is the usage of metamaterials in an invisibility cloak. This is accomplished by manipulating the paths traversed by light through a novel optical material. Metamaterials direct and control the propagation and transmission of specified parts of the light spectrum and demonstrate the potential to render an object seemingly ...

  3. Cloaking device - Wikipedia

    en.wikipedia.org/wiki/Cloaking_device

    A cloaking device is a hypothetical or fictional stealth technology that can cause objects, such as spaceships or individuals, to be partially or wholly invisible to parts of the electromagnetic (EM) spectrum. Fictional cloaking devices have been used as plot devices in various media for many years. Developments in scientific research [ 1] show ...

  4. Image sensor - Wikipedia

    en.wikipedia.org/wiki/Image_sensor

    Image sensor. An image sensor or imager is a sensor that detects and conveys information used to form an image. It does so by converting the variable attenuation of light waves (as they pass through or reflect off objects) into signals, small bursts of current that convey the information.

  5. Steganography - Wikipedia

    en.wikipedia.org/wiki/Steganography

    The same image viewed by white, blue, green, and red lights reveals different hidden numbers. Steganography (/ ˌ s t ɛ ɡ ə ˈ n ɒ ɡ r ə f i / ⓘ STEG-ə-NOG-rə-fee) is the practice of representing information within another message or physical object, in such a manner that the presence of the concealed information would not be evident to an unsuspecting person's examination.

  6. Digital watermarking - Wikipedia

    en.wikipedia.org/wiki/Digital_watermarking

    A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. [ 1] It is typically used to identify ownership of the copyright of such a signal. Digital watermarking is the process of hiding digital information in a carrier signal; the hidden information should, [ 2] but does not need ...

  7. Download, install, or uninstall AOL Desktop Gold - AOL Help

    help.aol.com/articles/aol-desktop-downloading...

    Download Desktop Gold. AOL Desktop Gold is included at no additional cost with your membership. 2. Under 'All Products' scroll to 'AOL Desktop Gold'. If you have an AOL Desktop Gold trial or subscription. Using the link in the Official AOL signup confirmation email you received. 1.

  8. Projection keyboard - Wikipedia

    en.wikipedia.org/wiki/Projection_keyboard

    A projection keyboard. A projection keyboard is a form of computer input device whereby the image of a virtual keyboard is projected onto a surface: when a user touches the surface covered by an image of a key, the device records the corresponding keystroke. Some connect to Bluetooth devices, including many of the latest smartphone, tablet, and ...

  9. Stealth aircraft - Wikipedia

    en.wikipedia.org/wiki/Stealth_aircraft

    Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, [ 1] visible light, radio frequency (RF) spectrum, and audio, all collectively known as stealth technology. [ 2] The F-117 Nighthawk was the first operational aircraft explicitly designed around stealth technology.