4. ➢ To have an understanding of both computer and human in the
interaction.
➢ To identify the computer and associated input–output devices and
➢ To investigates how the technology influences the nature of the
interaction and style of the interface.
4
Objectives
5. ➢ Activity 4:
❖ Discuss the computer and associated devices and investigate how the
technology influences the nature of the interaction and style of the
interface.
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Computer in HCI
6. ➢ Introduction
❖ In order to understand how humans interact with computers, we need to
have an understanding of both parties(human & computer ) in the
interaction.
❖ The previous chapter explored aspects of human capabilities and behavior
of which we need to be aware in the context of human–computer
interaction;
❖ This chapter considers the computer and associated devices and
investigates how the technology influences the nature of the interaction and
style of the interface.
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Computer in HCI
7. ➢ Introduction
❖ To understand human–computer interaction… need to understand
computers!
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Computer in HCI
what goes in and out
devices, paper,
sensors, etc.
what can it do?
memory, processing,
networks
8. ➢ A ‘typical’ computer system
❖ screen, or monitor, on which there are windows
❖ keyboard
❖ mouse/trackpad
❖ System unit
❖ variations
▪ Desktop
▪ Laptop
▪ PDA(Personal Digital Assistants)
❖ The devices dictate the styles of interaction that the system supports
❖ If we use different devices, then the interface will support a different style
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Computer in HCI
window 1
window 2
12-37pm
9. ➢ How many …
❖ Computers in your house?
▪ hands up, …
… none, 1, 2 , 3, more!!
❖ computers in your pockets?
❖ are you thinking …
▪ … PC, laptop, PDA
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Computer in HCI
10. ➢ How many computers …
❖ In your house?
▪ PC
▪ TV, VCR, DVD, WiFi, cable/satellite TV
▪ Microwave, cooker, washing machine
▪ Central heating
▪ Security system
✓ can you think of more?
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Computer in HCI
❖ In your pockets?
▪ PDA
▪ phone, camera
▪ smart card, card with
magnetic strip?
▪ electronic car key
▪ USB memory
✓ try your pockets and bags
11. ➢ Interactivity
❖ Long ago in a galaxy far away … batch processing
▪ Punched card stacks or large data files prepared
▪ long wait ….
▪ Line printer output
❖ Now most computing is interactive
▪ Rapid feedback
▪ The user in control (most of the time)
▪ Doing rather than thinking …
❖ Is faster always better? 11
Computer in HCI
12. ➢ Input Devices
❖ A computer system comprises various elements, each of which
affects the user of the system.
✓ Input devices for interactive use, allowing text entry, drawing
and selection from the screen:
▪ Text entry: traditional keyboard, phone text entry, speech and
handwriting
▪ Pointing: principally the mouse, but also touchpad, stylus and others
▪ 3D interaction devices.
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Computer in HCI
13. ➢ Introduction
✓ Output display devices for interactive use:
▪ Different types of screen mostly using some form of bitmap display
▪ Large displays and situated displays for shared and public use
▪ Digital paper may be usable in the near future.
✓ Virtual reality systems and 3D visualization which have special
interaction and display devices. Various devices in the physical world:
▪ Physical controls and dedicated displays
▪ Sound, smell and haptic feedback
▪ Sensors for nearly everything including movement, temperature, bio-
signs. 13
Computer in HCI
14. ➢ Introduction
✓ Paper output and input: the paperless office and the less-paper
office:
▪ Different types of printers and their characteristics, character styles
and fonts scanners and optical character recognition.
✓ Memory:
▪ Short-term memory: RAM
▪ Long-term memory: magnetic and optical disks, Flash disks….
▪ Capacity and limitations related to document and video storage
▪ Access methods as they limit or help the user.
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Computer in HCI
15. ➢ Introduction
✓ Processing:
▪ The effects when systems run too slow or too fast, the myth of the
infinitely fast machine
▪ Limitations on processing speed
▪ Networks and their impact on system performance.
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Computer in HCI
16. ➢ Assignment
I. Describe the following computer devices
1. Text entry devices (keyboards , chord keyboards, phone pads,
handwriting and speech)
2. Positioning, pointing and drawing (mouse, touchpad, trackballs,
joysticks etc.
touch screens, tablets, eyegaze, cursors)
3. Display devices (bitmap screens (CRT & LCD), large & situated
displays, digital paper)
4. Virtual reality and 3D interaction (positioning in 3D space,
moving and grasping seeing 3D (helmets and caves))
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Computer in HCI
17. ➢ Assignment
5. Paper: printing and scanning(print technology, fonts, page
description, WYSIWYG scanning, OCR)
6. Memory(short term and long term, speed, capacity, compression
formats, access)
7. Processing and networks (finite speed (but also Moore’s law),
limits of interaction, networked computing)
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Computer in HCI
