INTRODUCTION TO COMPUTERS

Full text

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INTRODUCTION TO

COMPUTERS

LECTURE 7 : WEEK 7

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TEXT AND REF. BOOKS

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Text Book:

Peter Norton (2011), Introduction to Computers, 7 /e, McGraw-Hill

Reference Book:

Gary B (2012), Discovering Computers, 1/e, South Western

Deborah (2013), Understanding Computers, 14/e, Cengage Learning

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MOBILE ALERT

Kindly

Switch Off

your Mobile/Cell Phone

OR

Switch it to

Silent Mode

Please

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GOOGLE SITE ADDRESS

FOR LECTURE NOTES AND STUDY MATERIAL

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TYPE

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Presented by: Asma Khan

INPUT/OUTPUT

DEVICES

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Learning Outcome

Input Devices

Keyboard, Mouse

Variants of the Mouse

Devices for the Hand

Optical Input Devices

Audiovisual Input Devices

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Input And Output

7

Input is any

data and instructions

entered

into the

memory

of a computer

Input

Device

is any hardware component

that allows users to enter

data

and

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Input And Output

Input Device:

Keyboard and pointing devices

Pointing devices:

Mouse is a pointing device because it

allows a user to control a pointer on the

screen.

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Input And Output

In GUI, a pointer is a small

symbol

on the

screen

whose location and shape

change

as a user

moves

a

pointing device.

A pointing device can select

text

,

graphics

and

other

objects

and click

buttons

,

icons

,

links

and

menu

commands.

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Input And Output

Mouse

There are 2 types:

Mechanical

mouse and

Optical

mouse.

Mechanical mouse has a rubber or metal ball on its

underside.

You should place a mechanical mouse on a mouse pad.

Mouse pad is a rectangular rubber or foam pad that provides better traction than the top of a desk

Optical mouse uses devices that

emit

and

sense

light

to

detect the mouse’s movement.

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Input And Output

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Mouse

Optical mouse is

More precise than a mechanical mouse

Dose not require cleaning as does a mechanical mouse. Also it is more expensive.

Mouse connects to a computer in several way:

By cable through mouse port, USB port and serial port. By wireless through IR or Bluetooth.

Wireless mouse or cordless mouse, is a battery-powered

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Input And Output

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Trackball

◻ Is a stationary pointing device with a ball on its top or side, Similar to a mechanical mouse that has a ball on the bottom.

◻ To move the pointer using a trackball, you rotate the ball with your thumb, fingers or the palm of your hand.

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Input And Output

Touchpad

◻ Is a small, flat, rectangular pointing device that is sensitive to

pressure and motion.

◻ To move the pointer, slide your fingertip across the surface of the pad.

◻ You also can tap the pad’s surface to imitate mouse operations such as clicking.

◻ Around the edge of the pad there are one or more buttons that work like mouse buttons.

◻ Touchpad's are found most often on notebook computers.

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Input And Output

Pointing Stick

Is a

pressure-sensitive

pointing device shaped like a

pencil eraser that is positioned between keys on a

keyboard.

To move the pointer you

push

the

pointing

stick

with a finger.

IBM

developed the pointing stick for its notebook

computers.

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Input And Output

Light Pen

Is a

handheld

pointing device that detect the

presence

of

light

.

To select

objects

on the screen, a user

press

the light

pen against the

surface

of the

screen

Or

points

the light pen at the

screen

and then

press

a

button

on the pen.

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Input And Output

The Keyboard

◻ Is an input device that contains keys users press to enter data and

instructions into a computer

◻ Desktop computer keyboard often attach to the System Unit using

Cable: a serial port or USB port. Without cables : IR or Bluetooth

◻ Wireless keyboard or cordless keyboard, is a battery-powered device that transmits data using wireless technology

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Computer Keyboard Keys

Function Keys

Cursor-Movement Keys

Numeric Keypad

Toggle Keys (Caps Lock, Num Lock)

Modifier Keys (Shift, Alt, Ctrl)

Windows Keys

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Capturing a Screen Image

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Print Screen

– Captures an

image

of the

entire

desktop

to the Clipboard.

Alt + Print Screen

- Captures

active

window

image

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Standard Computer Keyboard

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Input And Output

Touch Screen

Is a

touch-sensitive

display device.

Users can interact with these device by

touching

areas of the screen.

Because touch screens require a lot of arm

movements, you do not enter

large

amounts of

data

using a

touch

screen.

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Input And Output

Pen Input

Mobile users often enter data and instructions with

a

pen-type

device.

With pen input ,users

write

,

draw

, and

tap

on a flat

surface to enter

input

.

The surface maybe a

monitor

, a

screen

, a special

type of paper or

graphic

tablet

.

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Input And Output

Pen Input

2 devices used for pen input are

stylus

and

digital

pen.

Stylus is a small

metal

or

plastic

device that looks like a

tiny ink pen but uses pressure instead of ink.

A digital Pen, larger than a stylus

It’s available in 2 forms

Pressure-sensitive

Built in digital cameras.

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Input And Output

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Pen Input

Tablet

PCs use a

pressure-sensitive

digital pen and

PDAs

use a

stylus

.

Pressure-sensitive digital pens provide more

functionality

than a stylus.

Pen Input is possible on computers without touch screens

by

attaching

a

graphics

tablet

to the computer.

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Input And Output

Pen Input

◻ Digital pens that have built-in digital

cameras look like a ballpoint pen and

do not contain any additional buttons.

◻ As you write and draw on special digital paper with the pen, It capture

every hand written mark and then stores the images in the pen’s

memory.

◻ You then can transfer the image from the pen to a computer.

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Input And Output

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Other Types of Input

Voice Input

◻ Is the process of entering input by speaking into a microphone.

◻ Voice recognition , also called speech recognition, is the

computer’s capability of distinguishing spoken words.

◻ Some business software such as word processing and spreadsheet includes voice recognition as a part of the program.

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Input And Output

Audio Input

Is the process of entering any

sound

into the

computer

such as

speech

,

music

, and

sound

effects

.

User enter sound into computer via devices such as

Microphones

Tape players

CD/DVD players

Radios

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Input And Output

Other Types of Input

Digital Cameras

Allows users to

take

pictures and

store

the

photographed image

digitally

instead of on traditional

film.

They use internal

flash

memory to

store

images.

Others store images on mobile storage media, including

a flash memory, memory stick and mini CD/DVD.

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Input And Output

Digital Cameras

A digital camera's

resolution

is defined in pixels.

Pixel is a

smallest

element in an electronic image.

The

greater

the number of pixels the camera uses to

capture an image, the

better

the quality of the image.

Digital camera resolutions range from about

1 million

to more than

13 (or more) million

pixels (MP).

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Input And Output

Other Types of Input

Video Input

Is the process of a capturing

full-motion

images and storing

them on a computer’s storage medium.

Many Digital Video(DV) camera have the capability of

capturing

still

frames

as well as motion.

To transfer recorded images to a hard disk or CD or DVD,

users connect

DV

directly to a

USB

port on the system unit.

you can

play

or

edit

video using video editing SW.

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Input And Output

Scanners and Reading Devices

Some input devices save time by

capturing

data

directly from a

source

document

Optical scanner

Optical readers

Bar code readers

RFID readers

Magnetic strip card readers

Magnetic-ink character recognition reader.

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Input And Output

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1- Optical scanner

, Usually called a scanner

◻ Is a light-sensing input device that reads printed text and graphics

and then translates the results into a form the computer can process.

◻ Many scanner include OCR ( optical character recognition ) software, which can read and convert text documents into electronic

files.

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Input And Output

2- Optical Readers

Is a device that uses a

light

source

to read characters,

marks

and

codes

and then converts them into

digital

data

that a

computer can process.

Two technologies used by optical readers are

■ Optical character recognition.

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Input And Output

A- Optical Character Recognition (OCR)

◻ Involves reading handwritten, typewritten or printed text and translating the image into a form the computer can process.

◻ Most OCR devices include a small optical scanner for reading characters and sophisticated SW to analyze what read.

◻ It range from large machines that can read thousands of documents per minute to handheld that read one document at a time.

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Input And Output

B- Optical Mark Recognition (OMR)

Devices read

hand-drawn

marks such as small

circles

or

rectangles

.

One of the most familiar applications of optical mark

recognition is the use of

pencil bubble optical answer

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Input And Output

3- Bar Code Readers

◻ Also called bar code scanner

◻ Is an electronic device that uses laser beams for reading printed barcodes.

◻ Barcode is an identification code that consists of set of vertical lines and

spaces of different widths

◻ The barcode represent the data that identifies the manufacturer and the

item

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Input And Output

4- RFID Readers

Radio-frequency identification

Is a technology that uses

radio

signals

to communicate with

a

tag

placed in or

attached

to an

object

, an

animal

, or a

person

.

RFID tags, which contain a

memory

chip

and an

antenna

,

are available in many

shapes

and

size

.

RFID reader reads

information

on the tag via

radio

waves

. It

can be

handheld

devices or mounted in a

stationary

object

such as a

doorway

.

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Input And Output

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5- Magnetic Strip Card Readers

Often called a

magstrip

reader, reads the Magnetic strip on the

back of

credit

cards

or other similar cards.

The strip contains

information

identifying you.

Some information stored in the strip includes your

name

,

account

number

, the card

expiration

date, and a

country

code

.

If the Magnetic strip card readers rejects your card, it is

possible that the Magnetic strip is

scratched

,

dirty

or

erased

.

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Input And Output

Biometric Input

◻ Is the technology of authenticating a person’s identity by verifying a personal characteristic.

◻ Biometric devices grant users access to programs, systems, or rooms by analyzing some physiological or behavioral characteristic.

◻ Such as fingerprints, eye patterns, voice patterns, facial features, signatures and hand geometry.

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Input And Output

Biometric Input

Fingerprint scanner

Face recognition system

Hand geometry system

Voice verification

system

Signature verification

system

Iris recognition system

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Input And Output

Biometric Input

Sometimes, fingerprint ,iris and other biometric data are

stored on a smart card.

Smart card, credit card, stores the personal data on a thin

microprocessor that is embedded in the card.

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Any Questions !!!

END OF LECTURE 7

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