Interaction Devices

Keyboard remains the primary data entry device.

Point Devices - Examples

• Light pen
• Touch screen
• Mouse
• Trackball
• Joystick
• Graphics tablet
• Touch pad
• Foot controls
• Gloves
• Eye movement detectors

Pointing Device - Tasks

• Selection
• Positioning objects
• Orienting objects on screen
• Path tracing
• Quantify
• Text entry/editing (not easily done)

Speech Recognition, Digitization, and Generation

Components of Speech Technology

• Discrete word recognition
• Continuous speech recognition
• Speech store and forward
• Speech generation

Discrete Word Recognition

• 90 to 98% reliability for small vocabulary
• speaker dependent training
• people would rather type

When should it be used?

• Speakers hands are busy
• Mobility required
• Speakers eyes are occupied
• Harsh or cramped conditions prevent use of key board

Continuous speech recognition is more myth than reality.

Speech Store and Forward

• Voice mail type technology
• Video games
• Low cost
• Resource intensive

When to Use Speech Generation

• Message is simple
• Message is short
• Message will not be referred to later
• Message deals with events in time
• Message requires immediate response
• Visual communications channels are overloaded
• Environment lighting is bad
• User must move around
• User subjected to high G forces or lack of oxygen

Display Technologies

• CRT
• LCD
• Plasma panel
• LED

Video Display Features

• Rapid operation
• Reasonable size
• Reasonable resolution
• Quiet operation
• No waste paper
• Low cost
• Reliable
• Good for highlighting
• Good for graphics and animation

Image Technologies

• Scanners
• Digital cameras
• Digital video
• 12 inch video disk
• CD ROM
• DVD

Hardcopy Devices

• Printers
• Plotters
• Photographic printers