class 25 slides

7/27/2019 Class 25 Slides

http://slidepdf.com/reader/full/class-25-slides 1/25

Human-Computer InterfaceLecture 25Good judgment comes from experience; experience comesfrom bad judgment



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



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



Team Conferences

1. Zenith



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



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



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



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.



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.



Question 4

1. Windows

2. Excel

3. Word



Question 5

1. Scrolling

2. Hierarchical menus

3. Fisheye menus



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.



Question 7



LECTURE 25

In which we Speech Interfaces, Video Interfaces, and

Digital Printing



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



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



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



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.



Speech Generation

• Currently pretty good

• Intonation

• Can even capture individual’s speech intonation



Video Displays: Physical

Parameters• Dimensions

• Resolution

• Number of colors

• Luminance

• Power consumption

• Refresh rates

• Cost

• Reliability



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



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



Printing and Scanning

• With a scanner; digital printing can be an human interface

• Printer prints form; scanner captures data

• Difficulties

• Handwriting recognition

• Image processing



Project Competitive Analysis



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

class 25 slides

Documents