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Horizontal scan rate, or horizontal frequency, usually expressed in kilohertz, is the number of times per second that a raster-scan video system transmits or displays a complete horizontal line, as opposed to vertical scan rate, the number of times per second that an entire screenful of image data is transmitted or displayed.
Alexander Murray and Richard Morse invented and patented the first analog color scanner at Eastman Kodak in 1937. Intended for color separation at printing presses, their machine was an analog drum scanner that imaged a color transparency mounted in the drum, with a light source placed underneath the film, and three photocells with red, green, and blue color filters reading each spot on the ...
Horizon scanning (HS) or horizon scan is a method from futures studies, sometimes regarded as a part of foresight. [1] It is the early detection and assessment of emerging technologies or threats for mainly policy makers in a domain of choice.
Scan rate is a term used when discussing raster-scan video, describing the speed at which the image is transmitted or displayed.There are two types: Horizontal scan rate, the number of times per second that a single horizontal line of image data is transmitted or displayed
In a raster scan, an image is subdivided into a sequence of (usually horizontal) strips known as "scan lines".Each scan line can be transmitted in the form of an analog signal as it is read from the video source, as in television systems, or can be further divided into discrete pixels for processing in a computer system.
The horizontal dimension of the image is produced by moving either the truck or the scanning hardware. The cobalt-60 units use gamma photons with a mean energy 1.25 MeV , which can penetrate up to 15–18 cm of steel.
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The flyback transformer operates CRT-display devices such as television sets and CRT computer monitors. The voltage and frequency can each range over a wide scale, depending on the device. For example, a large color TV CRT may require 20 to 50 kV with a horizontal scan rate of 15.734 kHz for NTSC devices and 15.625 kHz for PAL devices.