Image scanner
In computing or computer, an image scanner is a device used to transfer images or text into a computer. There are special models for scanning photo negatives, or to scan books. In the computer, the signal from the scanner is transferred to a digital image. This image can then be edited, printed, etc. All scanners have special parts which are used to take a picture from an object. Charge-coupled device or Contact Image Sensor parts take the light from the object and change it into a digital signal. The digital signal is then transferred to the computer memory or is read in the scanner's processor. With some software it can be changed to a compressed digital image, like JPEG or PNG. Text written by hand can be changed to ASCII code by an OCR program.It is very important for computer
Contents
Types
The main types of scanner
- Desktop scanner (flatbed) This is probably the most popular type. An object to be scanned (picture, image, text sheet) is put on the glass. Under the glass, there is a moving Image Sensor.
- Hand scanner. The device is moved on the paper by hand. It was popular during the 1990s.
- Rotary scanner (Drum Scanner) used for fast scanning large numbers of sheets of paper.
Producers
- Canon
- HP
- Lexmark
- Mustek
- Plustek
- Other
Other pages
- PC camera
- Digital camera
- Digital photography
Images for kids
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A photographic print being scanned into a computer at the photo desk of the Detroit News in the early 1990s.
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Ministry of Culture, Sports and Tourism of the Republic of Korea issued a interpretation in June 2011 that it is a violation of Copyright Law to scan a book by a third party who is not a copyright holder or a book owner. Therefore, in South Korea, book owners visit 'Scan Room' to scan books by themselves.
See also
In Spanish: Escáner informático para niños