Gestures - Lunds tekniska högskola · Gesture Recognition. In K. M. Stanney (Ed.), Handbook of...
Transcript of Gestures - Lunds tekniska högskola · Gesture Recognition. In K. M. Stanney (Ed.), Handbook of...
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Gestures
Disclaimer: This is version 0.1 of this lecture. It mightcontain unfinished/unclear formulations as well as
subjective, non-validated data and opinions.
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Gesture-based interaction
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Research on gesture-based interactiongoes a long way back!
SketchPad, Ivan Sutherland 1963
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Put-that-there (Bolt, 1980)
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>20 years of Virtual realityresearch
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Two paradigms in gesture-basedinteraction
• On-screen
• Free-form/mid-air• Empty-handed
• Holding device
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How to define gestures in the field of interaction
design?
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Definition #1
”…any physical movement that a digital system can sense and respond to without the aid of a traditional pointing device such as a mouse or stylus.”
Saffer (2008)
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Definition #2
”…expressive, meaningful body motions –i.e. physcial movements of the fingers, hands, arms, head, face or body with the intent to convey information or interact with the environment.”
Turk (2002)
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Advantages with gesture-based interaction?
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Advantages with gesture-basedinteraction?• Gestures fundamental part of human
communication
• No need for designated input devices
• Has potential for high information bandwidth
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Gesture taxonomies
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Gesture taxonomies
• Problem:
Traditional taxonomies are not suited for gestureresearch in human-computer interaction (HCI)
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Kendon (1972)
1. Gesticulation
2. Language-like gestures
3. Pantomimes
4. Emblems (e.g. V for victory)
5. Sign languages
• Designed for speech-related gestures
• Not completely relevant for interaction design
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Aigner et al (2012)
1. Pointing gestures
2. Semaphoric gestures (e.g. thumbs-up meaning “OK”)
3. Pantomimic gestures
4. Iconic gestures (e.g. showing the size of an object)
5. Manipulation gestures (e.g. dragging an object)
• Gesture-based interaction without the support ofspeech input
• Tailor-made for interaction design!
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Innate and learnedgestures
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Innate gestures
• Gestures that the user intuitively knows or that
make sense, based on the person’s understanding of
the world
• Examples:• Pointing to aim
• Grabbing to pick up
• Pushing to select
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Learned gestures
• Gestures the user needs to learn before
• Examples• Waving to engage
• Making a specific pose to cancel an action
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Discussion: Samsung Smart TV gestures. Innate or learned?
http://www.samsung.com/global/microsite/tv/common/guide_book_5p_sr/main.html
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Are there any problems with gestures?
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Norman & Nielsen
• Gestural Interfaces: A Step Backwards in Usability
Norman & Nielsen (2010).
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Discoverability
Norman & Nielsen (2010).
• WIMP interaction is based on recognition and exploration => easydiscovery
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Discoverability
• We have moved awayfrom the principle ofdiscoverability
Norman & Nielsen (2010).
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Reliability
“When users think they did one thing but actually did something else, they lose their sense of controlling the system because they don't understand the connection between actions and results.”
Norman & Nielsen (2010).
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Gestures-based interaction needsa good conceptual model
http://www.youtube.com/watch?v=ls5kj7oVwto
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Gestures-based interaction needsa good conceptual model
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Are there any”standardized” gestures?
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Not really…
• We are test subjects in an enormous gestureexperiment
• Patent wars are probably not making things easier
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Nevertheless, there aresome conventions that areimportant to be aware of.
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Example ”Core” touch gestures
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Example ”Shake”
• Update
• Reset
• Next track
• Shuffle
• Unlock
• Remove
• Etc.
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”Shake”
• Intuitive
• Low demands on presicion
• (Probably) suitable for actions that involve a clearstate change
• Might not be suitable for usage that involves a moving user (false positives)
Smart Maps:Shake to remove all bookmarks on the map. What ifI’m in a hurry?
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Cultural aspects
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Discussion: does culture matter? If yes, how much?
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Cultural aspects
• The gesture ”The ring” has been found to have four major meenings:• OK/Good
• Orifice
• Zero
• Threat
Morris, Collett, Marsh, & O’Shaghnessy (1979)
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Cultural aspects
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Cultural aspects
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Cultural similarities and differences in user-defined gestures for touchscreenuser interfaces
• 340 participants defined their own gestures for 28 common actions (e.g. ”Zoom”)
• Generally a high agreement across cultures
• Higher agreement for actions that can be performed through direct manipulation
• Lower agreement for actions that were moresymbolic
Mauney, Howarth, Wirtanen and Capra (2010)
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Thumbs up to gesture-controlledconsumer electronics?
• Studying gestures for consumer electronics in 18 countries
• A limited gestural language already exists acrosscultures (that could be used of basic commands)
• As complexity increases, cultural differences start to emerge
• Participants seemed to prefer semantic gesturesover pointing gestures
UX fellows (2013)
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A preliminary theoretical study in naturalinteraction applied to cultural heritagecontexts
• Comparison of gestures for interaction withvirtual environments
• 19 basic actions
• Three countries: Italy, Sweden and Egypt
Pescarin, S., Pietroni, E., Wallergård, M., Omar, K., Rescic, L. and Rufa, C. (2013).
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Example of preliminary results
• ”Select”• Italy: Pointing
• Sweden: Pointing/One open hand
• Egypt: Two open hands
Pescarin, S., Pietroni, E., Wallergård, M., Omar, K., Rescic, L. and Rufa, C. (2013).
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Design principles for gestures
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Look for ”un-offical” standards!
• Example ”Shake” is used for Update, Reset, Nexttrack, , Shuffle, Unlock, Remove etc.
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Game mindset ≠ UI mindset
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Game mindset ≠ UI mindset
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Consider physical ergonomics
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Consider social factors
• Are the gestures proper for the social context?• Might they be disturbing to other people?
• Will they make the user feel ashamed?
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Help new users
• Quick tutorial
• Visual que or hint
• A describing image
• Animations
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Offer a good conceptual model
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Further reading
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References
• Aigner, R., Wigdor, D., Benko, H., Haller, M., Lindlbauer, D., Ion, A., Zhao, S., et al. (2012). Understanding Mid-Air Hand Gestures: A Study of Human Preferences in Usage of Gesture Types for HCI. Technical report, Microsoft Research.
• Bolt, R. A. (1980). Put-that-there”: Voice and gesture at the graphics interface. Proceedings of the 7th annualconference on Computer graphics and interactive techniques, 14(3), 262–270. doi:10.1145/800250.807503
• Kendon, A. (1972). Some relationships between body motion and speech. In A. W. Siegman & B. Pope (Eds.), Studies in dyadic communication. New York: Pergamon Press.
• Mauney, D., Howarth, J., Wirtanen, A., & Capra, M. (2010). Cultural similarities and differences in user-definedgestures for touchscreen user interfaces. Proceedings of the 28th of the international conference extendedabstracts on Human factors in computing systems CHI EA 10, 4015.
• Norman, D. & Nielsen, J. (2010). Gestural Interfaces: A Step Backwards in Usability. Interactions 17(5).
• Pescarin, S., Pietroni, E., Wallergård, M., Omar, K., Rescic, L. and Rufa, C. (2013). Natural Interaction in the Cultural Heritage Domain: A preparatory Study on Cross-cultural Natural Gestures. Proceedings of Digital Heritage 2013, Marseille, October 28 – November 1.
• Saffer, D. (2008). Designing Gestural Interfaces: Touchscreens and Interactive Devices. Interactive GesturesDesigning Gestural Interfaces (p. 272). O’Reilly Media.
• Sutherland, I. E. (1964). Sketch pad a man-machine graphical communication system. Simulation, 2(5), 6.329–6.346.
• Turk, M. (2002). Gesture Recognition. In K. M. Stanney (Ed.), Handbook of Virtual Environments (pp. 223–237). London: Lawrence Erlbaum Associates, Publishers.
• UX fellows (2013). Thumbs up to gesture-controlled consumer electronics? A cross-cultural study spanning 18 countries on spontaneous gesture behavior by UX Fellows. Technical report, UX fellows.