Computer Literacy

1
Computer Literacy

• Input
• Devices

2
Computer Literacy
Keyboard
Mouse
Touch
COMPUTER
Pen-based
Scanners
Voice
3
Computer Literacy
Keyboard
Mouse
Touch
COMPUTER
Pen-based
Scanners
Voice
4
Computer Literacy

• Pressure Sensitive

Touch pads use a pressure-sensitive membrane that
has a built-in grid of sensing wires.
5
Computer Literacy

• Infrared

Infrared LEDs
Photo detectors
One way of implementing touch screen technology
is by criss-crossing the screen with invisible
beams of infrared light. When your finger nears
the screen, it interrupts the beams of light and
the coordinate is determined.
6
Computer Literacy
Keyboard
Mouse
Touch
COMPUTER
Pen-based
Scanners
Voice
7
Computer Literacy
8
Computer Literacy
9
Computer Literacy
Keyboard
Mouse
Touch
COMPUTER
Pen-based
Scanners
Voice
10
Computer Literacy
Mark sense
OCR
MICR
UPC
Graphics/Text
11
Computer Literacy
Mark sense
OCR
MICR
UPC
Graphics/Text
12
Computer Literacy
Mark sense
OCR
MICR
UPC
Graphics/Text
13
Computer Literacy

• OCR

Most OCR devices store character patterns in ROM.
Characters that are read are compared with the
character patterns stored in memory and are
matched on the basis of the lightness and
darkness.
14
Computer Literacy

• FONTS

15
Font Characteristics
Computer Literacy

• Orientation - Portrait or landscape
• Spacing - Proportional or fixed
• Pitch - Characters per horizontal inch
• Point size - Character height
• Style - Upright or italic
• Stroke weight - Medium or bold
• Typeface - Courier, Times Roman, Helvetica,
  etc.

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Computer Literacy

• Orientation
  

Portrait
Landscape
17
Computer Literacy

• Spacing
  

W
I
FIXED
W
I
PROPORTIONAL
18
Computer Literacy
Pitch
Number of Characters per horizontal inch
This pitch is 10 characters/inch
This pitch is 12 characters/inch
This pitch is 16.67 characters/inch
19
Computer Literacy
Point Size (1 pt 1/72 inch)

• Times Roman 2 pt
• Times Roman 6 pt
• Times Roman 12 pt
• Times Roman 24 pt

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Computer Literacy

• Style
• UPRIGHT UPRIGHT
• ITALIC ITALIC

21
Computer Literacy

• Stroke Weight
• MEDIUM MEDIUM
• BOLD BOLD BOLD

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Computer Literacy

• Type Face
• Times Roman
• Helvetica
• Trafalgar
• Algerian
• Wide Latin
• Script

23
Computer Literacy

• Serifs UP!!!

Times Roman The Worlds Most Readable Serif
Typeface
Helvetica The International Sans Serif Typeface
24
Computer Literacy
Mark sense
OCR
MICR
UPC
Graphics/Text
25
Computer Literacy

• MICR

Process Control Number
Amount
Check Routing Symbol
ABA Transit Number
Account Number
26
Computer Literacy
Mark sense
OCR
MICR
UPC
Graphics/Text
27
Computer Literacy

• UPC

Start / End Markers
4 8 0 0 1 2 6 5 6 8
Manufacturer ID
Product ID
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Computer Literacy
Mark sense
OCR
MICR
UPC
Graphics/Text
29
Computer Literacy
30
Computer Literacy
Keyboard
Mouse
Touch
COMPUTER
Pen-based
Scanners
Voice
31
Computer Literacy

• Voice Recognition

1010010101
COPY
input to computer system
analog to digital converter
pattern matching
Microphone
template library
1010010100
1010010101
32
Computer Literacy

• Voice
• Control
• Software

33
Computer Literacy

• Voice
• Dictation
• Software

34
Computer Literacy
Keyboard
Mouse
Touch
COMPUTER
Pen-based
Scanners
others
Voice
35
Computer Literacy

• Magnetic Stripes Smart Cards
• ATMs
• POSs

36
Computer Literacy
This section is finished