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Table of contents



Contents Page

Introduction



Definition of Scanner



Benefits of Scanner



Types of Scanner



Reference
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(2)



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(3-4-5)



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Introduction

There are many advanced technology nowadays that we cannot live without them, for example computer, fax, telecomm nation system and scanner. One important devise of them is scanner which use for different purpose .It’s an external device used to record data on to the computer. The data can include photographs, book pages, and other images already on a piece of paper. The scanner is like a copy machine, but instead of printing the item on a piece of a paper, the digital image gets placed on the computer screen. There are many components of a scanner including:
• Bed: the glass screen that documents are placed on.
• Lid: the top of the scanner that is closed in order to scan a document clearly.
• Function bar: the place where the buttons are located.
• Functions: the buttons that can be pressed in order to scan print or email. The document. Some scanners do not have all of these functions.
• Power switch: the power button which is normally located in the back of the scanner.
















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Definition of scanner:

Scanner means a device that captures images from photographic prints, posters, magazine, and similar sources for computer editing and display.
Scanners usually attach to your personal computer with a Small Computer System Interface (SCSI). An application such as photo shop uses the TWAIN program to read in the image.


Memory Requirements:

An 8.5”x 11” page or photo scanned at 300 megabytes in size. The rule amount of memory that you require in your machine is: 20.5 times 5 plus 17.5 megabytes for the operating system. Windows NT requires more. Thus, the minimum requirement would recommend for heavy users of scanning applications is 128 megabytes. Certainly, I would have at least 64 megabytes. If you have less memory, image editing becomes very, very slow.


Benefits of scanner:


1. Advanced scanner exchange offers fast response to any U.S location.
2. There are no unexpected charges. All parts and labor are covered.
3. More uptime is achieved when problem resolution and operational assistance is provided over the phone by product specialist.
4. Person NCS arranges for shipping and pays shipping both ways.
5. Web based support person NCS.com.












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Types of Scanner:
There are many types of scanners available today.
The first type, Flatbed Scanner is one of the most commonly used and most recommended scanners. This scanner allows the user to place a full piece of paper, book, magazine, photo or any other object onto the bed of the scanner and have the capability to scan that object. While the Flatbed scanner is an excellent recommendation, expect more desk space to be used than any other option as well expect to pay more for the scanner.
Images are placed on a glass bed either with or without a holder. The scan area varies in size from 8-1/2" x 11" scanning area, 300 to 400 spi scanning ability (often interpolated to 800, 1200, or 1600 "spi"), 8-bits per color channel, and low cost.
The highest resolution you can achieve without interpolation is about 5,000 dpi. With interpolation, the resolution may increase to about 11,000 dpi..





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The Second type of scanner is Sheetfed which is another commonly used scanner which allows a user to scan pieces of paper into the computer. While the sheetfed is a less expensive solution when compared to the flatbed scanner, the sheetfed is limited to 400dpi and the available options which can be scanned.



The third type is Handheld which is not commonly used scanner option and can be difficult to find at stores. The handheld option allows the user to drag over select sections of pages, magazines, books and other objects scanning only sections.
Handheld scanners can refer to scanners with several different uses. One type is a small, portable document scanner. Other types include UPC code readers and business card scanners.
They can only scan 2"-5" at a time so are only useful for small photos. They are sometimes called half-page scanners and are the least expensive type of scanners.

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The fourth type is Cardscan which is excellent solution for anyone interested in scanning business cards for record purposes. While sometimes surprising, the cardscanners can sometimes be an expensive solution for only having the capability to scan business cards.


The fifth type is Drum scanners are used by service bureaus to create very high quality color separations for the printing industry and large digital enlargements. These scanners have the best dynamic range and color accuracy currently available.
Drum scanners are generally higher quality but are also very expensive. Some have the capabilities to scan at a resolution of 12,000 dpi without interpolation. Drum scanners cost from $25,000 to several hundred thousand dollars and require trained operators to achieve the best results.
Generally, drum scanners have a larger scanning area than the other types. Some offer scanning drums that are 20" x 24" or larger. The larger scanning area makes it possible to scan large items or a combination of several smaller items.The disadvantage of drum scanners is that the original image must be thin and flexible enough to be wrapped around the drum.





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References



1- Wigand. [Online].Available:http://www.wikipedia.org/wiki/Scanner-cited.


2- Tedeschi, R. [Online].Available http://www.nytimes.com Technology


3- Webcrawler: http://www.radiolabs.com /products/scanners/uniden-bc796d.


4- http://avg.urlseek.vmn.net/search.php?lg=en&mkt=en&type=dns&tb=ie&tbn=avg&q=blog%2Escannerwarehouse%2Ecom





































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