Mid-air Pan-and-Zoom on Wall-sized Displays

● Mathieu Nancel et al.● CHI 2011 Session: Mid-air Pointing &

Gestures

● Presenter: Fan Hong● Apr. 25, 2012

Task● Pan-zoom navigation● Wall-sized display● Mid-air interaction● “focus on that area over there”

Design Space

Unimanual vs. Bimanual Input

Linear vs. Circular Gestures

Degree of Guidance

Design Space(2)● Unimanual vs. bimanual Input● Linear vs. circular gestures● Guidance through passive haptic

feedback● Input gestures via a device(1D Path, 2D

Surface) vs. in free space(3D Free)

● 12 techniques

Interaction

Goal● Performance (task time and accuracy)● Usability (fatigue and ease of use)

Hypotheses● Two-handed gestures faster(H1) and more accurate

and easier to use(H2) than one-handed gestures● Linear gestures are slower because of

clutching(H3)● Users prefer clutch-free circular gestures(H4)● Techniques using fingers(1D Path and 2D Surface)

faster than those requiring large muscle group(3D Free conditions)(H5)

● 1D path gestures are faster, with fewer overshoots than techniques with less haptic feedback(2D Surface and 3D Free)(H6)

● 3D Free gestures are more tiring(H7)

Experiment●Movement Time & Overshoots

Conclusion● Handedness:● Two-handed gestures faster(H1✔) and more

accurate and easier to use(H2✔) than one-handed gestures

Conclusion(2)● Gestures:● Linear gestures are slower because of

clutching(H3✘)● Users prefer clutch-free circular gestures(H4✘1/12)

Conclusion(3)● Device vs. Free Space:● Techniques using fingers(1D Path and 2D Surface)

faster than those requiring large muscle group(3D Free conditions)(H5✔)

● Haptic Feedback:● 1D path gestures are faster, with fewer overshoots

than techniques with less haptic feedback(2D Surface and 3D Free)(H6✔)

Conclusion(4)● 3D Free gestures are more tiring(H7✔)

● No significant fatigue effect.● Distance affects a lot.● Participants prefer Two Hands(8/12), Linear

Gestures(10/12).● Mixed preferences about the degree of

guidance(4/12 for 1D Path).

Summary & Comments● Bimanual > Unimanual● Linear > Circular● Device (1D Path, 2D Surface) > Free

Space (3D Free)

● Free Hand● Circular● Fatigue

Thanks!