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Its all about scanners

18 Aug 2013
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Today I am posting some details about scanners, about how did they work.  well scanner is an important machine for offices, school and collage works, any document related works. But Scanners are of many types, scanner which scans documents and converts them into digital data, bar-code scanner, computerized Tomography, finger print  and retina scanner, those who have got their uid or adhar card might know this, and there are myriad number of examples, so, without wasting much time let us jump into real thing    

Scanners
Several technologies that digitize, read, detect, and trace images, objects, or signals can be
grouped under this term. The better known are computer scanners and bar-code scanners,
but scanners are also used in medicine, biometric identification, security systems, and
detection of radio frequencies. Some computer scanners incorporate text-recognition software,
which can digitize printed, typed, or even handwritten text. This capability has been very useful in
digitizing a great amount of material at universities and libraries; however, it has also encouraged
pirating in publishing



How an Image Is Digitized
The scanner comes from the phrase “to scan.” An image is scanned by a head that transforms it into digital data.
1.THE ORIGINAL
can be any document with a flat surface, such as a photograph, a paper document, or a page in a book.

 



  





2. SCANNER HEAD
analyzes a photograph and converts it into digital information.


 





3.DIGITAL ARRAY
The data from the sensor are placed in an array
that is used in reconstructing the image







4. IN THE COMPUTER
The image, converted into numerical
data, is displayed on the computer. The
image can be retouched and enhanced
through specialized computer programs


Other Types of Scanners

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