1 Interaction Devices CIS 375 Bruce R. Maxim UM-Dearborn

2 User Communication Keyboard remains the user’s primary input device Most GUI systems expect pointing devices as well –Light pen –Touch screen –Mouse –Trackball –Joystick –Graphics tablet –Touch pad –Foot controls –Gloves –Eye movement detectors

3 Pointing Device Tasks Selection Positioning objects Orienting objects on screen Path tracing Quantify Text entry/editing (not easily done)

4 Speech Technology Discrete word recognition Continuous speech recognition Speech store and forward Speech generation

5 Discrete Word Recognition 90 to 98% reliability for small vocabulary Usually requires speaker dependent training Most people would rather type than dictate

6 When should you use it? Speakers hands are busy Mobility required Speakers eyes are occupied Harsh or cramped conditions prevent use of key board

7 Speech Store and Forward Voice mail type technology Video games Low cost Resource intensive

8 When to use computer generated speech? 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