3. Scanning Devices
- -These are devices that capture data directly into the computer.
- -They can also be defined as
devices that use a magnetic or photo-electric source to scan and convert images
into electric signals that can be processed by an electronic apparatus, such as
Uses of Scanning Devices
Scanning devices are commonly used to:
- -Convert a text document into an electronic file;
- -Convert a photograph into an electronic graphic file;
- -Sense an image to be sent over a voice frequency
- -Circuit, such as a fax machine;
- -Reproduce text and images, as with a copier.
Classification of scanning devices
Scanners are classified according to technology used to capture data namely: optical and magnetic scanners.
These scanners capture data using optical or light technology.
Examples of optical scanners
|Bar Code and Scanner types|
These scanners use magnetic technology to capture handwritten and magnetic strip data. E.g. MICR (magnetic ink character recognition), card readers etc
MICR-Magnetic Ink Character Recognition
these scanners are used to read characters written using magnetic ink as shown left. Mostly used in banks to read cheques
|Magnetic Ink Character Recognition (MICR)|
A magnetic card reader is a device which reads information contained in a encrypted sequence on a magnetic strip
Also known as graphic tablet, allows a user to draw an image using a stylus
|Digitizer and a Stylus|
Also known as a digicam. Is a camera that takes video or still photographs by recording images on an electronic image sensor
It is an electronic visual
display that can detect the presence and location of a touch within the display
Also known as speech recognition (SR). Is the translation of spoken words into text.
Interactive Whiteboard (IWB)
It is a large interactive display that connects to a computer and projector. A projector projects the computer's desktop onto the board's surface where users control the computer using a pen, finger, stylus, or other device. The board is typically mounted to a wall or floor stand.
they are used in a variety of settings, including classrooms at all levels of education, in corporate board rooms and work groups, in training rooms for professional sports coaching, in broadcasting studios and others.