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What is Scanner?
2022-03-11 19:06:07

What is Scanner?

A scanner is a hardware input gadget that peripherally renders or reads a given image and transforms it into a digital format, one which is accessible by computer.

It was first created in 1860, but Russell Kirsch discovered the scanner that we used today in 1957. It is a kind of data-converter that clutches practical non-fictional objects and transforms them into a digital format that the computer understands. The very first document that he considered testing was his son's image, and the measurement of the same was 5*5cm and had a picture resolution of 176*176 pixels.

It is only a one-way device which signifies that it can only pass data into the computer and cannot receive data from the computer like another device such as a printer. It is an input gadget that examines countless documents, be it a photograph, images, or pages of text. After completing the scanning procedure, this device switches the hard copy into a soft copy.

A larger share of scanners is known to be flatbed gadgets. It consists of a parallel or plain scanning facet that seems perfect for scanning documents like magazines, photographs, and other documents.

Almost every flatbed scanner has a surrounding shield that upraises so that numerous other documents like books and some other bulky objects can also be scanned. There is also a different type of scanner that is exactly the opposite of the flatbed scanners called 'sheet bed scanners', which only take on paper documents.

A scanner optically works with computer software programs, typically extracting information from the scanning device. Scanning plug-ins can also be embedded into a computer system which will help the machine automatically operate scanned images directly.

How is Scanner Connected?

A simple scanning device can be connected to a computer via many facets. Nowadays, we commonly use scanners by connecting them through a USB cable. Here are the various following methods through which you can connect a scanner into your system:

  • Firewall
  • Parallel
  • SCSI
  • USB

Types of Scanner

This section will discuss the various types of scanners that are available in the market today for your use.

Flatbed Scanner

A flatbed scanner operates close to a photo state machine that you encounter in any cyber cafe. It creates a soft copy of your document rather than a hard copy or paper copy. It consists of a sensor and source of light which navigates through the glass pane to scan the data and reproduce its soft copy.

It is quite popular among all the scanners in the market.

Its advantages over other scanners are high-speed scanning, wireless scanning, easy file management, etc. They require enormous space due to their heavy and bulky nature, which sums up their biggest drawback.

Sheetbed Scanner

As mentioned in the name, it is a type of scanner with a horizontal and vertical surface. It is typically assigned to scan single-paged documents, and they fail to scan thick objects such as a book which is also their major drawback. The various ingredients that constitute a sheetbed scanner are sheet-feeder, scanning module, and calibration sheet.

Hand-held Scanner

All the scanners that we talked about in earlier sections of this article were heavy and bulky and required a large amount of space to store, but handheld is a type of scanner you can carry anywhere. It is a portable type of scanner which has a small rod-like structure that fits in your hand perfectly. To scan your data, you have to haul it over the whole document with a stable hand, as even a single movement can ruin the whole image.

Photo Scanner

This type of scanner is generally used to examine a certain image, photograph, or even painting. Other scanners can also retain and scan an image, but the high-resolution quality produced by a photo scanner is something you can't compare with others. Some even have an in-built image editing software that generates high-quality images.

Drum Scanner

It consists of a photomultiplier (PMT) to examine or, in simpler words, scan images. The PMT tubes are vacuum tubes that are case-sensitive to light, emphasizing that an image is scaled on a glass pane. When the grin of light passes over the image, its reflection is captured by the PMT and then reproduced.

OMR Scanner

It stands for Optical Mark Recognition. This type of scanning device perceives the data on specific areas of a certain page. It can identify hand-drawn marks such as small circles and rectangles generally created with pen or pencils. They are typically used to conduct examinations, surveys, questionnaires, etc. It comes in handy for easy evaluation of the answer sheets.