Transcript Chapter 5 Input - University of Mary

Discovering
Computers 2010
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CIS 101:
Introduction to Computers
What Is Input?
What is input?

Data or instructions entered into memory
of computer

Input device is any hardware component used
to enter data or instructions
Levi Krein
Associate Professor, CIS
What Is Input?
What are the two types of input?

Data


Raw unprocessed text,
numbers, images,
audio, and video
Instructions



Programs
Commands
User responses
A program is a series of related
instructions that tells a computer
what tasks to perform and how to
perform them
Programs respond to commands
that a user issues
A user response is an instruction a
Levi Krein to a question
user issues by replying
displayed byAssociate
a program
Professor, CIS
What Are Input Devices
An input device
is any hardware
component that
allows users to
enter data and
instructions into
a computer
How is the keyboard divided?



Typing area
Numeric keypad
Function keys, special
keys that issue
commands
The keyboard is the
most common input
device on computers.
Levi Krein
Associate Professor, CIS
Types of Keyboards
Wired
Keyboards
Wireless
Keyboards
USB port
Bluetooth
Keyboard
port
IrDA
The Keyboard
What is the insertion point?


Blinking vertical bar that indicates where next
character you type will display
Pointer changes
location and shape
as you move mouse
or other pointing
device
pointer


Block arrow
Pointing hand
insertion point
Levi Krein
Associate Professor, CIS
The Keyboard
What is an ergonomic keyboard?

Designed to minimize strain on hands and wrists

Ergonomics incorporates comfort, efficiency, and safety
into design of items in workplace; user friendly devices
Levi Krein
Associate Professor, CIS
Pointing Devices
What is a mouse?

A pointing device that fits under palm of hand

Pointing device controls
movement of pointer, also
called mouse pointer

A mouse can be wired or
wireless

An optical mouse senses
light to detect mouse’s
movement
Levi Krein
Associate Professor, CIS
What is a trackball?


Stationary pointing device
with a ball on its top
To move pointer, rotate ball
with thumb, fingers, or palm
of hand
Levi Krein
Associate Professor, CIS
What is a touchpad or touch screen?

A monitor or small, flat, rectangular surface
sensitive to pressure and motion
Levi Krein
Associate Professor, CIS
What is a pointing stick?

A pointing device shaped like pencil eraser
positioned between keys on keyboard
Levi Krein
Associate Professor, CIS
Types of game controllers


Joystick is vertical
lever mounted
on a base
Wheel is
steering-wheel-type
input device

Pedal simulates
car brakes and
accelerator
Levi Krein
Associate Professor, CIS
What is pen input?
With pen input, you
touch a stylus or
digital pen on a
flat surface to
write, draw, or
make selections
Levi Krein
Associate Professor, CIS
What is Voice Input?
Voice input is the process of entering data by speaking
into a microphone
Voice recognition is the
computer’s capability of
distinguishing spoken
words
Levi Krein
Associate Professor, CIS
What is a MIDI input?
Audio input from a musical instrument
(musical instrument digital interface).

External device, such as electronic piano keyboard,
to input music and sound effects
Levi Krein
Associate Professor, CIS
What is a portable keyboard?
An input devices for mobile users

Full-sized keyboard you
conveniently attach to
and remove from PDA
Levi Krein
Associate Professor, CIS
What is a docking station?

External device that holds
mobile computer

Provides connections to
peripherals
Levi Krein
Associate Professor, CIS
What is a digital camera?

Allows you to take digital pictures

Images viewable immediately on camera
Categories of cameras
Field cameras
Point-and-shoot camera
Studio cameras
Levi Krein
Associate Professor, CIS
Two factors affect the quality of digital camera photos:
Resolution
Number of bits
stored in each
pixel

• Resolution is the number of horizontal and
vertical pictures in a display device
• A pixel is the smallest element in an
electronic display
• Each pixel consists of one or more bits of data
• The more bits used to represent a pixel, the
more colors and shades of gray that can be
represented
Pixel (picture element)
is single point in
electronic image

Greater the number of
pixels, the better the
image quality
Like Consumer Reports, cnet reviews
cameras, TVs, computers etc. Click to check
out cnet.
Levi Krein
Associate Professor, CIS
What is video input?

The process of entering full-motion mages into computer

Video capture card is
adapter card that converts
analog video signal into
digital signal that
computer can use

Digital video (DV)
camera records video as
digital signals
Levi Krein
Associate Professor, CIS
Video Input
Video: Video Editing on Your Computer
CLICK TO START
What is a Web cam?
A digital video camera that displays its
output on a Web page, it can:
Capture video and
still images
Send e-mail
messages with
video attachments
Broadcast live
images over the
Internet
Add live images
to instant
messages
Make video
telephone calls
What is videoconferencing?

Two or more geographically separated people
who use a network or the Internet to transmit
audio and video data

Whiteboard is
another window on
screen that can
display notes and
drawings
simultaneously on
all participants’
screens
Levi Krein
Associate Professor, CIS
What is a scanner?
Flatbed
Pen or Handheld
Sheet-fed
Drum

Light-sensing device that reads printed text and graphics
 Used for image processing, converting paper documents into
electronic images
What is an optical reader?

A device that uses light source to read characters, marks, and
codes and then converts them into digital data

Optical character recognition
(OCR) reads characters &
translates them into ASCII (bytes)
characters

Optical mark recognition (OMR)
reads hand-drawn pencil marks,
such as small circles

Bar code scanner
Levi Krein
Associate Professor, CIS
Next
What is a turnaround document?

Document that you
return to the company
that sent it

Portion you return has
information printed in OCR
characters
Levi Krein
Associate Professor, CIS
What is a bar code scanner?

Uses laser beams to read bar codes
Levi Krein
Associate Professor, CIS
What is a bar code?

Identification code that consists of a set of vertical
lines and spaces of different widths

Universal Product
Code (UPC)
Levi Krein
Associate Professor, CIS
What is a magnetic-ink character recognition (MICR) reader?


Can read text printed with magnetized ink
Banking industry almost exclusively uses MICR
for check processing
Levi Krein
Associate Professor, CIS
Other Input Devices
What is an RFID reader?

Reads information on
the tag via radio waves

Can be handheld
devices or mounted in a
stationary object
Levi Krein
Associate Professor, CIS
What is a Magnetic stripe card readers?
Devices that read the magnetic stripe on the
back of cards such as:
Credit cards
Entertainment cards
Bank cards
Other similar cards
What is a data collection device?

Obtains data directly at location where transaction or
event takes place

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Warehouses; outdoors; remote areas
Transmits (uploads) data over a network
or Internet; wired or wireless
Levi Krein
Associate Professor, CIS
What is a point of sale (POS) terminal?

Records purchases,
processes credit or debit
cards, and updates inventory

Swipe credit or debit card
through card reader — reads
customer’s personal data
from magnetic strip
c
c
Levi Krein
Associate Professor, CIS
Terminals
What is an automatic teller machine (ATM)?

Self-service banking machine that connects to host
computer through network
ATM crime
Levi Krein
Associate Professor, CIS
What is biometrics?
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

Authenticates person’s
identity by verifying
personal characteristic
Fingerprint scanner captures
curves and indentations of
fingerprint
Hand geometry system measures
shape and size of person’s hand
Levi Krein
Associate Professor, CIS
More examples of biometric technology

Voice verification system compares live
speech with stored voice pattern
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Signature verification system recognizes
shape of signature

Iris recognition system reads
patterns in blood vessels in back
of eye

Biometric data is sometimes stored
on smart card, which stores
personal data on microprocessor
embedded in card
Levi Krein
Associate Professor, CIS
Biometrics
Levi Krein
Associate Professor, CIS
What input devices are available for
those with physical limitations?

Keyguard allows users to rest
hands on keyboard without
accidentally pressing keys

Head-mounted pointer controls
pointer on screen
New developments include gesture
recognition and computerized
implant devices

Levi Krein
Associate Professor, CIS
Chapter 5 Complete
Levi Krein
Associate Professor, CIS