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7/27/2019 Class 25 Slides
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Human-Computer InterfaceLecture 25Good judgment comes from experience; experience comesfrom bad judgment
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Current Scrum Masters
Team Scrum Master
Alpha Ganesh
Smile Shruti
Omega Aakansha
Gotham City Group Vivek
Avengers Manoj
Phoenix Kalyani
Team Horcrux Prajakta
Triumph Avinash
Decepticons Varsha
Excellence Nisha
Zenith Diksha
Team 404 Monika
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House Cup Totals
Team Points
Alpha 33
Smile 35
Omega 39
Gotham City Group 48
Avengers 42
Phoenix 53
Team Horcrux 35
Triumph 48Decepticons 55
Excellence 49
Zenith 35
Team 404 40
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Team Conferences
1. Zenith
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Today: Unit IV
• Introduction to interaction Devices DTUI 8.1
• Keyboards and Function Keys DTUI 8.2
• Pointing Devices DTUI 8.3
• Speech and Auditory Interfaces DTUI 8.4
• Speech Recognition
• Image and Video Displays
• Printers
• Response Time and Display Rate with Respect to Display DTUI
10.2
• Goals of Collaboration DTUI 9.2
• Asynchronous and Synchronous Interfaces DTUI 9.4
• Face-to-Face Interfaces DTUI 9.5
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T 2
0
2
4
6
8
10
12
14
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Marks
Marks
Average: 15.2
Standard Deviation: 3.7
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Question 1
• Criteria Weight O1 O2 O3
• Criteria 1 5 0 0 -1
• Criteria 2 10 0 0 1
• Criteria 3 15 0 -1 -1
• Total 0 -15 -10
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Question 2
• Joe is a student writing a paper on Human Computer
Interaction for a Computer Science class. He knows nothing
about HCI, so he goes to Wikipedia and types “Human
Computer Interaction” into the search box. Wikipedia returns
an article that give a brief overview of HCI and provides somearticles for further research.
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Question 3
Title: Search for “Human Computer Interaction” using Wikipedia
Main Success Scenario:
1. The user enters the URL for Wikipedia into a web browser.
2. Wikipedia returns a web page that provides the interface to
the encyclopedia.3. The user enters “Human Computer Interaction” into the
search box and hits return.
4. Wikipedia returns the page needed.
Alternative flow:
3.a. The user types “Human Computer” into the search screen.
3.b. Wikipedia returns a list of articles that have these terms in it.
3.c. The user finds the page needed and selected the link for thatpage.
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Question 4
1. Windows
2. Excel
3. Word
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Question 5
1. Scrolling
2. Hierarchical menus
3. Fisheye menus
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Question 6
1. There is no plan to make money.
2. There is no discussion of the cost of developing the code.
3. There is no discussion of the cost of support.
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Question 7
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LECTURE 25
In which we Speech Interfaces, Video Interfaces, and
Digital Printing
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From I/O to Human Interface
• Back in the old days, we talked about “peripherals” that were
either “input devices” or “output devices.” The computer was
just the CPU and Memory
• In the ‘80’s the growth of personal computers and particularly
the Macintosh lead people to think of the computer as thedevice with with the user interacts, not just the CPU and
Memory.
• In the older terms:
• Keyboards are input devices
• Monitors and Printers are output devices
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Speech Interface is I/O
• The Speech Interface is a HCI system that does not easily fall
into either input or output.
• It takes in speech and produces speech
• Many of the processes it needs to perform to understand speech,
it needs to do in reverse to produce speech
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Speech has had limited success
• Even on mobile devices, Siri is more a novelty than an
interface.
• Voice user interfaces have become common on telephones
replacing operators for simple tasks.
• Difficulties
• Noise
• Privacy
• Increased cognitive load compared with pointing
•
Speech is ephemeral
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Voice Recognition
• Pretty good at single word recognition (e.g. Yes/no)
• Speaker dependent systems work better than speaker
independent system
• Greater difficulty at continuous speech recognition
• Additive error rates
• Word boundary problems
• Continuous speech is improved by taking into account
grammar and context.
• In conversational systems, the computer can ask the user torepeat.
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Speech Generation
• Currently pretty good
• Intonation
• Can even capture individual’s speech intonation
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Video Displays: Physical
Parameters• Dimensions
• Resolution
• Number of colors
• Luminance
• Power consumption
• Refresh rates
• Cost
• Reliability
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Types of Video
• CRT: bulky, high power consumption, flicker, but cheap
• LCD: think, lower power, no flicker, expensive but becoming
cheaper
• Projection: High power consumption, but large screens
• LED: Brighter than LCD, but high energy consumption
• OLED: Brighter than LCD, but expensive, new technology
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Digital Printing
• Originally permanent output device: monitors indicated
internal state through blinking lights.
• Human readable output moved to monitors with the CRT in
the 60’s and 70’s
• Currently digital printing is disrupting publishing• An the first copy of traditional printing is very expensive;
subsequent copies are very cheap.
• The cost of printing a digital book is the same from the first book
to the last.
• Publishers can print copies of books as needed.
• Publishers can ship digital copies of book and print then where
needed
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Printing and Scanning
• With a scanner; digital printing can be an human interface
• Printer prints form; scanner captures data
• Difficulties
• Handwriting recognition
• Image processing
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Project Competitive Analysis
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Competitive Analysis
• On the internet search for companies that are working on the
same kind of thing you are working on.
• Describe each product and indicate how yours is different and
better.
• Due: October 28