Week 4 Flashcards

1
Q

A computer system is made up of various elements?

A
Input devices
Output devices
Virtual reality
Physical interaction
Paper
Memory
Processing
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2
Q

A typical computer system?

A

screen or monitor
Keyboard
Mouse/Trackpad

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3
Q

Text entry devices?

A

Keyboards
Chord keyboards, phone pads
Handwriting, speech

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4
Q

QWERTY?

A

Standardized layout

arrangement not optimal for typing

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5
Q

DVORAK?

A

Biased towards right hand

10-15% improvement in speed and reduction in fatigue

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6
Q

Chord Keyboards?

A

Only a few keys - four or 5
Compact size
Short learning time
Fast

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7
Q

Speech Recognition?

A

Improving rapidly
Most successful when
- Single user
- Limited vocabulary systems

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8
Q

Problems with Speech Recognition?

A

External noise interfering
Imprecision of pronunciation
Large vocabularies
Different speakers

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9
Q

Positioning, pointing and drawing?

A

Mouse, touchpad
Trackballs, joysticks
Touch screens, tablets
Eyegaze, cursors

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10
Q

Mouse?

A

Two characteristics

  • Planar movements
  • Buttons
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11
Q

Two methods for detecting motion?

A

Mechanical

Optical

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12
Q

Who developed first mouse?

A

Douglas Engelbart

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13
Q

Touchpad?

A

Small touch sensitive tablets
Stroke to move mouse pointer
Used mainly in laptop computers

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14
Q

Advantages of touch sensitive screen?

A

Fast, and requires no specialized pointer
Good for menu selection
Suitable for use in hostile environment: clean and safe from damage

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15
Q

Disadvantages of touch sensitive screen?

A

Finger can mark screen
Imprecise
Lifting arm can be tiring

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16
Q

Eyegaze?

A

Control interface by eye gaze direction
User laser beam reflected off retina
Mainly used for evaluation

17
Q

Display Devices?

A

Bitmap screens
Large & situated displays
Digital paper

18
Q

Bitmap displays?

A

Screen is vast number of coloured dots

19
Q

Aspect Ratio?

A

Ratio between width and height

4:3 for most screens, 16:9 for wide-screen TV.

20
Q

Colour Depth?

A

How many different colours for each pixel
Black/white or greys only
256 from a pallete

21
Q

Jaggies?

A

Diagonal lines that have discontinuities in due to horizontal faster scan process

22
Q

Anti-Aliasing?

A

Softens edges by using shades of line colour

Also used for text

23
Q

Liquid crystal displays?

A

Smaller, Lighter and no radiation problems
Found on PDAs, portables and notebooks
Also used in digital watches, mobile phones

24
Q

How liquid crystal display works?

A

top plate transparent and polarized, bottom plate reflecting.
Light passes through top plate and crystal, and reflects back to eye.

25
Special Displays?
Random Scan | Direct View Storage Tube
26
Situated Displays?
Displays in public places Display only Or interactive In all cases the location matters
27
Virtual Reality and 3D Interaction?
Positioning in 3D space Moving and grasping Seeing 3D (Helmets and Caves)
28
Positioning in 3D space?
``` Cockpit and virtual controls The 3D mouse Data glove VR Helmets Whole body tracking ```
29
3D Displays?
Desktop VR | Seeing in 3D
30
VR Headsets?
Small TV screen for each eye Slightly different angles 3D effect
31
VR Motion Sickness?
Time delay Depth perception Conflicting cues => sickness
32
Time delay?
Move head... lag .. display moves | Conflict: head movement vs eyes
33
Depth perception?
Headset gives different stereo distance But all focused in same plane Conflict: eye angle vs focus
34
Conflicting cues => Sickness
Helps motivate improvements in technology