How The Invention Of The Computer Scanner Has Improved
Although the concept of capturing images from originals with the objective of transferring them over telegraph lines dates from the early nineteenth century, the computer scanner did not come into existence until 1957. The team that created this machine, led by Russel Kirsch, had created the first drum scanner, a technology that continues to be used in computer scanning today, though improvements have been made on the original invention. The drum scanner The first type of scanner used with computers, drum scanners, were effective but limited. Because the image was placed on a rotating glass drum, they involved a precision that was often time-consuming. As alternatives were created for daily use, such as the hand scanner and later the desk-top scanner, improvements made on the drum scanner made it the standard for photographic recording and reproduction. The quality of the scan improved with the addition of laser light sources, as well as three-beamed sources making color scanning a reality. Today, the drum scanner is used in photographic enlargement, where its high resolution is an advantage. It is also used for larger scans, such as architectural plans, where it would be impractical to scan by hand or on a flat-bed device. The hand scanner The hand scanner began as a simple, hand-held device meant to capture text. With the appearance of an electric razor, the scanner was passed over the document to be scanned, which was illuminated by a series of LED light sources. This type of scanner was convenient as it could be taken up and used on documents without having to place them in a separate machine. One of the disadvantages of the hand scanner, though, was that the quality of the image was limited by the steadiness of the hand of the person passing the scanner. With the implementation of the desk-top, flat-bed scanner to the pool of modern office machines, the hand scanner was relegated to more specific jobs, such as 3D scanning of objects. With this change in use, technology in the hand scanner improved from simply capturing black text on a white background to interpreting contours and digitizing them for computer manipulation. The desk-top scanner Designed for office work, the desk-top or flat-bed scanner resembles a photocopy machine. Instead of having to place originals with great precision or have a steady hand, documents are simply placed face-down on a glass platen and the machine does all the work, moving a light source and recording the image for later use on the computer. These convenient scanners can usually be plugged directly into USB ports instead of special cable entries and though the quality of the final scan is less than that offered by drum scanners, it is usually adequate for document and even non-professional photographic scanning. The camera scanner Taking advantage of leaps in the digital photography arena, the camera scanner is much like a hand-held digital camera. Its advantages lie in that it is a gentle scanner, useful in the digitizing of rare books or fragile documents. From a simple drum scanner, developed to reach objectives of image recognition for ever evolving computers to the 3D scanner used to map architectural and engineering projects, scanners have gone through an evolution that is not close to its end. Room is available for both improvements in the final quality of scanned material as well as how actual scans are processed. Today's office scanners which combine photocopying with printing with fax capacity are just one example of how the scanner can not only be an intricate part of presently existing technology but can actually expand on that technology.
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