Third Lecture of Human Computer Interaction
Third Lecture of Human Computer Interaction CSC212
Comsats Institute of Information Technology
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This 19 page Bundle was uploaded by Alina Mario on Friday March 25, 2016. The Bundle belongs to CSC212 at Comsats Institute of Information Technology taught by Yasmeen Khaliq in Spring 2016. Since its upload, it has received 18 views. For similar materials see Human Computer Interaction in ComputerScienence at Comsats Institute of Information Technology.
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Date Created: 03/25/16
Lecture 3 Human Computer Interaction COMSATS INSTITUTE OF INFORMATION AND TECHNOLOGY In the Previous Lecture Human Visual System Human Auditory System Touch Movement Human memory Human Thinking Process In T oday’ s Lecture Computer Input/Output Input Text entry devices Pointing/ Positioning and Drawing devices Output Display Devices Virtual Reality Computer Interaction Batch processing Interactive processing Input Devices Text entry devices ◦Keyboards ◦Handwriting Recognition ◦Speech Recognition Pointing/ Positioning and Drawing devices ◦Mouse/ Trackball / Joystick ◦Touchpad and Touchscreen ◦Stylus and Light pen ◦Eyegaze ◦Cursors Keys Keyboards Alphanumeric keyboard ◦QWERTY ◦Alphabetic ◦DVORAK Chord Keyboard Phone Pad Alphanumeric Keyboard Most common input device Working: ◦Key press closes connection ◦Character code is sent to the processor Functions: ◦entering textual data ◦Commands ◦Numeric Keys for calculations QWERTY Keyboard Adopted from typewriter keyboard Digits and Letter in fixed layout Not optimal for typing Non-Alphanumeric Keys varies ‘Key’ arrangements differs in various keyboards ◦American, British and French Keyboards Alphabetic Keyboard Keys arranged in alphabetic order Purpose: faster typing Not faster for ◦Trained typists ◦Novice users ◦Occasional users DVORAK Keyboard Frequently used letters under dominant fingers Purpose: faster typing Biased towards right handers ◦56% keystrokes with right hand 10-15% typing speed improvements Chord Keyboard A few keys (4-5 keys) Combination of keys produces letters Advantage: ◦Compact ◦Fast typing ◦Involves only one hand ◦Shorthand typing Disadvantage: ◦Difficult to use Handwriting Recognition Involves pen-based interactive tablets Problems: ◦Interpreting individual handwriting ◦Inferring letters within words ◦Understanding all useful information Advantages: ◦Easy to use ◦Compact Speech Recognition Involves commands through speech Problems: ◦Pronouncing hurdles ◦Different accents ◦Large vocabularies ◦Noise interfering ◦Requires training Advantages: ◦Disabled persons ◦Keyboard-free inputs Pointing/ Positioning/ Drawing Mouse/ Trackball / Joystick Touchpad and Touchscreen Stylus and Light pen Eyegaze Cursors Keys Display Devices Bit-Map Display ◦Large number of color dots (pixels) CRT ◦Cathode Ray Tube LCD ◦Liquid Crystal Display Digital Papers ◦Thin flexible material written electronically ◦Retains display Virtual Reality Provides ◦navigation through 3D virtual worlds ◦manipulation of virtual objects ◦Six degrees of freedom ◦ 3 degrees ◦ Pitch (up/down angle) ◦ Yaw (left/right orientation) ◦ Roll (twist about its own axis) Degrees of freedom VR 3D space positioning Virtual controls ◦Desktop virtual reality Cockpit ◦Steering, gear, knobs 3D Mouse ◦Six dimensions Gloves and helmets ◦Finger positioning and head movements Whole body tracking ◦Accelerators strapped to body parts VR 3D Display Utilizes effects of shadows, occlusion and perspective Seeing in 3D ◦Stereoscopic images VR motion sickness ◦Time delay ◦ Lag between head motion and scene change ◦Depth perception ◦ Different stereo distances Simulator and VR caves ◦Special general purpose rooms and simulators or projectors
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