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Input Devices

This presentation provides information about input devices.

charmaine cutajar

on 26 November 2012

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Transcript of Input Devices

An input device allows data
to be entered in order to
convert it into a form that can be processed by the computer. Keyboard Ergonomic Keyboards Pointing Devices Ergonomic keyboard is a keyboard
that lays out the keys in a more
natural position to your hands
to help reduce strain on the hands
and help reduce Repetitive Strain
Injury (RSI). a device with which you can control the movement of the pointer to select items on a display screen. Keyboards The most common type of keyboard is the
QWERTY keyboard. It is called QWERTY because these are the first letters to be found under the number row. A mouse allows a computer user to control the cursor to manipulate data without complicated commands. A trackball is the upside down version of the mouse. This pointing device consists of a
ball housed in a socket containing sensors to detect rotation of the ball about the two axes.
The cursor is moved by the trackball with a thumb or finger. A track point is a mouse solution used with
portable computer. A track point is a small joystick
the size of a button placed between the "G", "H" and "B" keys on the keyboard. The track point pointer is controlled like a joystick and is moved with one finger. It is an alternative to an external mouse or touchpad. A touch pad is also known as a track pad. The computer user moves the cursor by dragging the finger on the pad in the direction desired. The selection buttons are placed at the bottom of the pad. They have the same function s as the left and right buttons of a mouse. A light pen is a computer input device that looks like a felt tip pen and is connected to the computer by a wire. It allows the user
to point to displayed objects, or draw on the screen, but with greater positional accuracy. This pointing device uses a light-sensitive detector to select objects on a display screen. A light pen is similar to a mouse, except that with a light pen the user can move the cursor and select objects on the display screen by directly pointing to the objects with the pen. A touch screen is a display which can detect the presence and location of a touch within the display area. It is a type of display screen that has a touch-sensitive transparent panel covering the screen. A computer user interacts with the touch screen without the usage of a pointing device such as a mouse but by using the finger to point directly to objects on the screen.
A touch screen can act both as an input and output device at the same time and can be found in ATMs, schools (touch IWBs), smartphones.

The touch screen uses either gesture recognition or handwriting recognition to relay the item clicked or the information written on the screen to the computer.
Gesture recognition is used to identify input to carry out a command, while handwriting recognition is used to translate handwritten input into digital text. An input device that enables you to enter drawings and sketches into a computer.

A pen (also called a stylus) looks like a simple ballpoint pen but uses an electronic head instead of ink. The tablet contains electronics that enable it to detect movement of the cursor or pen and translate the movements into digital signals that it sends to the computer.

These tablets may also be used to capture data of handwritten signatures. Such devices are used for the verification of signatures in banks and parcel delivery.
Graphical designers, illustrators,engineers and central data operators.
A graphics tablet consists of a flat surface upon which the user may "draw" an image using an attached stylus, a pen-like drawing apparatus.

http://www.scanmalta.com/eshop/catalogsearch/result/?q=graphics+tablet&x=0&y=0 An image scanner is an input device that optically scans images, printed text and converts them into a computer readable form (i.e. picture images to binary values). Optical Character Recognition usually abbreviated to OCR is the process where images of letters can be entered into the computer as data. The OCR reader uses a scanner to read images of characters and compares each image with a set of character patterns that are stored in the computer's database. http://www.computerhope.com/tips/tip155.htm Optical Mark Reader (OMR) captures human-marked data from document forms such as surveys, questionnaires and multiple choice tests. This medium is suitable for handling questionnaires for market research and multiple choice answer sheets.
Many traditional Optical Mark Reader devices work with a dedicated scanner device that shines a beam of light onto the form paper. The contrasting reflectivity at predetermined positions on a page is then utilised to detect the marked areas because they reflect less light than the blank areas of the paper.
OMR technology scans a printed form and reads predefined positions and records where marks are made on the form. Magnetic Ink Character Recognition (MICR) is a tool to facilitate the processing of cheques. This device enables banks to process 300 cheques per minute with 100% accuracy. These numbers are written in a special ink which contains iron particles. This ink is magnetised and commonly called 'magnetic ink'. It can be read by a special machine called a Magnetic Ink Character reader (MICR).
The MICR will only recognise numbers printed in a standard font using the magnetic ink. This provides a high level of security because any attempt to alter the magnetic ink printout with normal ink by writing over it will be ignored. A digital camera is a camera that takes video, digital photographs or both. It records images via an electronic image sensor. A digital camera can display images on a screen immediately after they are recorded, can store thousands of images on a single small memory device, record video with sound and delete images to free storage space. Some can crop pictures and perform other elementary image editing.
Digital cameras are incorporated into many devices such as PDAs and mobile phones. The Hubble Space Telescope and other astronomical devices are essentially specialised digital cameras. The pen computing refers to a computer user-interface using a pen and tablet rather than devices such as keyboard and a mouse. Pen computers generally require special operating systems that support handwriting recognition so that users can write on the screen or on a tablet instead of typing on a keyboard.
Common pen computers include personal digital assistants (PDAs), mobile devices such as cell phones and wireless tablet PCs. A joystick is a cursor control device used mainly in
computer games. Joysticks are available
in many shapes and sizes, along with different
ways to make the target move to a
specific X and Y coordinate on the screen. Every
selected position is changed to binary and is sent
for processing in the computer.
During your research please find out what consoles are as they are part of the gaming industry. A microphone is an input device that allows
computer users to input audio into their
computers. The audio is translated into
binary and reproduced as sound via speakers. Nowadays most people carry on them some form of data card, either to get access to their workplace or for business transactions which include banks' Automatic Teller Machines (ATMs). In this case data cards allow the information of a person to be stored in various ways on a magnetic strip at the back of the card or in embedded chips inside the card itself. When a person passes the card over a card reader, the information is read and the appropriate processing can start. On a downside , these data cards are sensitive to dirt, scratches and powerful magnetic fields so they must be handled with attention. A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. There are 2 types of of bar code readers mainly: hand held and flat bed scanner.
The hand held scanners typically used in libraries identifies the book and all the information about it.Hand held scanners are generally cheap and have a low resolution (800dpi). Their advantage is that these scanners can be portable and small in size. The scanning width of these devices is limited to their size.

A flatbed scanner works on the same concept of a photocopier. A document is placed on a glass bed and light is emitted from the bottom, along the length of the document, to reproduce the same image that is lit up at that time. Such devices are of a high resolution and colour capability. Pen computing The pen computing allow people to share, store, organise, and receive their handwritten information. An optical sensor embedded in the pen captures the handwritten images and stores them in its in-built memory. When required the captured digital information can then be transferred to the PC. http://personaldigitalpen.com/ Pen Computer A computer that utilizes an electronic pen (called a stylus) rather than a keyboard for input. Pen computers generally require special operating systems that support handwriting recognition so that users can write on the screen or on a tablet instead of typing on a keyboard. Most pen computers are hand-held devices, which are too small for a full-size keyboard.
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