Information Technology-Input and Output Devices

Topics: Computer, Cathode ray tube, Inkjet printer Pages: 10 (2633 words) Published: February 16, 2012
1.Scanning devices
Optical Scanners
An optical scanner is a hardware input device that allows a user to take an image or text and convert it into a digital file, allowing the computer to read or display the scanned object. Features of the optical scanner include-its design, software compatibility, type of feeder, speed, resolution, etc. Some advantages of the optical scanner include : •Easy to use

Continuous, detailed, and scaled true-colour images for documentation and interpretation •Portable and/or stable devices
Enables the user to alter the scanned object on the computer to their likeness •Ability to scan low quality paper and get some presentable image •Long lasting lifetime
Little maintenance required
Low failure rate
Disadvantages of the optical scanner include:
In the case of a power failure, everything is lost
Takes up a lot of memory space
May be slow at times due to the model or age
May sometimes lose some of the quality of the image depending on various circumstances.

Card Readers
A card reader is a data input device that reads data from a card-shaped storage medium. Historically, paper or cardboard punched cards were used throughout the first several decades of the computer industry to store information and programs for computer system, and were read by punched card readers. More modern card readers are electronic devices that use plastic cards imprinted with barcodes, magnetic strips, computer chips or other storage medium. A memory card reader is a device used for communication with a smart card or a memory card. A magnetic card reader is a device used to read magnetic stripe cards, such as credit cards. Features of a memory card reader include- design, software compatibility, speed, etc; while features of the magnetic card reader include- design, speed, compatibility, etc. Some advantages of the different types of card readers are: •Easy accessibility and usage

Portable and/or stable
As in the case of magnetic card readers, an easy way to make a payment without the risk of being robbed as you don’t need cash on you •For memory card readers, it allows easy use and you don’t have to use and wear/strain the cable •Allows information to be processed quickly and easily

Can be read directly on to the computer
Saves battery life on devices
Ability to read more than one item at a time (memory card reader) Disadvantages of the various card readers include:
Easy to be damaged (by scratches, magnetic waves, etc)
Easily lost
Magnetic card readers credit cards are easy to hack and causes identity theft and fraud •All information may be lost under certain circumstances
Cannot read more than one item at a time (magnetic card reader) •High maintenance
High failure rate due to damages and circumstances

Barcode Readers
A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones. Additionally, nearly all barcode readers contain decoder circuitry analyzing the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port. Features of the barcode reader include- software compatibility, speed, design, etc. Advantages of barcode readers include: •Easy use

Portable and/or stable
Uploads directly into the system
Low maintenance
Disadvantages of barcode readers include:
Easily damaged
High failure rate
Cannot read more than one item at a time
All information may be lost under certain circumstances

Character and Mark Recognition Devices
Mark Recognition is the process of capturing human-marked data from document forms such as surveys and tests. Many traditional mark recognition devices work with a dedicated scanner device that shines a beam of light onto the form paper. The contrasting reflectivity at...
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