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A light pen detects changes in brightness of nearby screen pixels when scanned by cathode-ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the ...
Sketchpad ran on the MIT Lincoln Laboratory TX-2 (1958) computer at the Massachusetts Institute of Technology (MIT), which had 64k of 36-bit words.The user drew on the computer monitor screen with the recently invented light pen, which relayed information on its position by computing at what time the light from the scanning cathode-ray tube screen is detected.
Capacitive styluses work by distorting the screen’s electrostatic field. [9] Screens that receive input from a capacitive stylus (as well as human fingers) can't register pressure applied by the pen; tilting of the pen; and can't distinguish between a capacitive stylus, your finger, or a resting palm as input - it will register all of these ...
An ultraviolet (UV) marker is a pen whose marks are fluorescent but transparent; the marks can be seen only under an ultraviolet light. They are commonly used in security situations to identify belongings or to prevent the reproduction of unauthorized banknotes. UV pens can now be bought at some stationery shops to securely mark items of high ...
Livescribe is a paper-based computing platform that consists of a digital pen, digital paper, software applications, and developer tools.. Central to the Livescribe platform is the smartpen, a ballpoint pen with an embedded computer and digital audio recorder.
The first optical answer sheets were read by shining a light through the sheet and measuring how much of the light was blocked using phototubes on the opposite side. [11] As some phototubes are mostly sensitive to the blue end of the visible spectrum , [ 12 ] blue pens could not be used, as blue inks reflect and transmit blue light.
If your employee came to you in 1975 and told you he'd invented the digital camera, what would you do? If you were Kodak, the answer was to effectively shove him in a closet and hope the product ...
The Wii Remote uses an infrared video camera in the handheld controller, rather than a simple sensor. [12] Wesley Yin-Poole stated that the Wii Remote was not as accurate as a traditional light gun. [13] GunCon 3 is an infrared light gun used for the PlayStation 3 port of Time Crisis 4. [14]