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Different Types of Scanner
Different Types of Scanners
A look at the different types of scanners available in the market today, along with their uses, advantages and disadvantages. Read on...
A scanner is an electronic device that scans printed or handwritten text documents, images, or a particular object to convert them into a digital file format. Most of the scanners use CCD, (charge-coupled device) or CIS, (Contact Image Sensor) as the image sensors. The common types of scanners we see today are flatbed scanners, handheld scanners, sheetfed scanners, etc.
Flatbed Scanner
A flatbed scanner is made up of a glass pane and a moving optical CIS or CCD array. The pane is illuminated with the help of bright light planted underneath it. The image which is to be scanned is then placed on the glass pane. The sensor and the source of light move across the glass pane to scan the document and produce its digital copy.
Sheetfed Scanner
In sheetfed scanners, the document that is supposed to be scanned is fed into the horizontal or vertical slot provided in the scanner. The vital components of sheetfed scanner are the sheet-feeder, scanning module and calibration sheet. Such scanners are most often used to scan single page documents. It can't be used to scan thicker objects, like books, which turns out to be its major drawback.
Handheld Scanner
A handheld scanner is a small manual scanning device which is moved over the object that need to be scanned. For instance, if a document needs to be scanned, the handheld scanner has to be dragged over the document. Using a handheld scanner can prove to be a cumbersome task, as the hand needs to be steady all the time. Slight movement of the hand can lead to distortion of the image. One of the most utilized handheld scanner is the barcode scanner, typically used in shopping stores to valuate goods.
Photo Scanner
Photo scanners are mostly used to scan photographs. High resolution and color depth are the most vital requirements for scanning photographs, and photo scanner provides the same. If the motive of buying a scanner is to digitize film negatives and slides, then the photo scanner is the best option. They are specially designed to work on slides and negatives. The in-built software in some photo scanners can also help in cleaning old photographs.
Film Scanner
A film scanner is utilized to scan photographic films directly into a computer. The photographer has direct control over certain aspects, such as cropping, ratio of original image on the film, etc. Some film scanners have specialized software through which it is possible to minimize scratches and improve color quality. Low-end film scanners most often accept 35 mm film strips while the high-end scanners have interchangeable film loaders which can accept 35 mm strips or 120 mm ones, or individual slides.
Portable Scanners
Being small in size, portable scanners can be easily carried with oneself anywhere. Some of these are as small as your PDAs, hence, can be easily carried in the pockets. They are of great help when it comes to text document scanning. Their drawback though, is their limitation as far as resolution is concerned. They cannot be used for scanning photographs or other such applications which require high resolution scanning.
Over the last few years, these machines have become an important element of computer technology, wherein vast amount of data is required to be converted to digital format every day.
A look at the different types of scanners available in the market today, along with their uses, advantages and disadvantages. Read on...
A scanner is an electronic device that scans printed or handwritten text documents, images, or a particular object to convert them into a digital file format. Most of the scanners use CCD, (charge-coupled device) or CIS, (Contact Image Sensor) as the image sensors. The common types of scanners we see today are flatbed scanners, handheld scanners, sheetfed scanners, etc.
Flatbed Scanner
A flatbed scanner is made up of a glass pane and a moving optical CIS or CCD array. The pane is illuminated with the help of bright light planted underneath it. The image which is to be scanned is then placed on the glass pane. The sensor and the source of light move across the glass pane to scan the document and produce its digital copy.
Sheetfed Scanner
In sheetfed scanners, the document that is supposed to be scanned is fed into the horizontal or vertical slot provided in the scanner. The vital components of sheetfed scanner are the sheet-feeder, scanning module and calibration sheet. Such scanners are most often used to scan single page documents. It can't be used to scan thicker objects, like books, which turns out to be its major drawback.
Handheld Scanner
A handheld scanner is a small manual scanning device which is moved over the object that need to be scanned. For instance, if a document needs to be scanned, the handheld scanner has to be dragged over the document. Using a handheld scanner can prove to be a cumbersome task, as the hand needs to be steady all the time. Slight movement of the hand can lead to distortion of the image. One of the most utilized handheld scanner is the barcode scanner, typically used in shopping stores to valuate goods.
Photo Scanner
Photo scanners are mostly used to scan photographs. High resolution and color depth are the most vital requirements for scanning photographs, and photo scanner provides the same. If the motive of buying a scanner is to digitize film negatives and slides, then the photo scanner is the best option. They are specially designed to work on slides and negatives. The in-built software in some photo scanners can also help in cleaning old photographs.
Film Scanner
A film scanner is utilized to scan photographic films directly into a computer. The photographer has direct control over certain aspects, such as cropping, ratio of original image on the film, etc. Some film scanners have specialized software through which it is possible to minimize scratches and improve color quality. Low-end film scanners most often accept 35 mm film strips while the high-end scanners have interchangeable film loaders which can accept 35 mm strips or 120 mm ones, or individual slides.
Portable Scanners
Being small in size, portable scanners can be easily carried with oneself anywhere. Some of these are as small as your PDAs, hence, can be easily carried in the pockets. They are of great help when it comes to text document scanning. Their drawback though, is their limitation as far as resolution is concerned. They cannot be used for scanning photographs or other such applications which require high resolution scanning.
Over the last few years, these machines have become an important element of computer technology, wherein vast amount of data is required to be converted to digital format every day.
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{ Jayesh
Patel} (Live In
:- Gujarat)
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