Input Techniques for Mobile
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This document summarizes a study investigating back-to-front pinching for eyes-free mobile touch input. The study tested how factors like device thickness and target location affect pinching errors. It collected data from 18,000 pinches across different thicknesses and angles. The results showed that thickness and target location have a main effect on error, with error increasing with thickness and moving along a curve for off-center targets. Limitations included not varying digitizer size, but future work could explore learning algorithms.
Input Techniques for Mobile
- 1. /32 Presented by : Nafees Ahmed Supervised By : Dr. Shah Rukh Humayoun 1
- 2. /32 Understanding Back-to-Front Pinching for Eyes-Free Mobile Touch Input 2
- 3. /32 HaptiCase Phone protection case with tactile landmark at the back correspond the size and position of apposed touch screen Overview 3
- 4. /324
- 5. /32 To Understand which factors lead to an Error Device thickness Tilt angle Target Location on the pinch error Our Goal 5
- 6. /32 Mapping Error User may not map the location of the distant target to the back of the phone precisely, resulting in a mapping Error Pinching Errors Thumb and finger position may not match. Errors 6
- 7. /32 PinchPad: Performance of Touch-Based Gestures while Grasping Devices focuses on combining front and back device interaction on grasped devices, using touch-based gestures combined two iPads together back-to-back and test touch-based interactions Limitations In PinchPad the offset was not quantified it means that an offset along the horizontal axis between the thumb at the front and the other fingers at the back of the device were not matched their position. Thickness was also a big issue for an accurate pinching. Related Work 7
- 8. /32 Two touch digitizers 5” Shielding 2,0mm Cardboard Slice 18g Tactile landmarks 5 Thickness 4 angles Experiment Design 8
- 10. /32 Collection of 18,000 pinches are studied Three factors (H1) Distribution of touches around targets at the back differ widely from those pinched at the front. (H2) Thickness have a main effect on ERROR. Error increases for both x and y with increasing thickness. (H3) With increasing “ANGLE” pinches move along a curve at the lower left for targets at the left resp. (H4) Target also have a main effect on Error Results 10
- 11. /32 Results 11
- 12. /32 Results 12
- 13. /32 Didn’t Vary the size of Digitizers Future Work Learning algorithms Limitations 13
- 14. /32 Title of the paper doesn’t clearly reflect the content of the paper The location on the screen could properly touched with some practice and learning while trying to touch the respective location of the finger on the back Own Evaluation 14
- 15. /32 Investigating the Effects of Splitting Detailed Views in Overview+Detail Interface 15
- 16. /32 Interfaces: Detail View Overview + Detail View(O+D) About 16
- 17. /32 Need of Overview + Detail View Details view cumbersome Difficulty increased when working on multiple regions. Purpose To find of usability of Multiple view vis-a-vie Single view To support study with working via graphical nodes Need & Purpose of Study 17
- 18. /32 Topology of Links Do not support simultaneous working viz., Multi display etc. Multi- Screen Helps in case of large contexts such as geographical data Rotation of object position preferred Multi-Focus Screen Distortion Technique used Multi touch interaction help in folding data manifold Related Work 18
- 19. /32 Molecular Interaction Maps(MIM) Interaction technology Helps utilizing detailed views Related Work (cont.) 19
- 20. /32 O + D interface is deployed in design detailed view interface Classified into three views: Split View Helps in understanding screen area and dividing it into parts Overview Translation Representation of positive view on overview Interface Design 20
- 21. /32 Views Splits a view further into sub views: 1 view 2 view 4 view Easy to focus Split Views 21
- 23. /32 Views: Displays the entire graph on larger display Ratios with Split Views: 9 for 1 view configuration 18 for 2 view configuration 36 for 4 view configuration Overviews 23
- 24. /32 Views: Translates overview of a split view into View Icon based on the positioning. Working with views: Position can be adjusted with direct screen manipulation Multi touch supported Translation View 24
- 25. /3225
- 26. /32 Experiment Conducted: Conducted to check effects of multiple detailed views. Task was to identify node positions which were translated and then selecting them through the split views. Apparatus: Tablet and one PC. Working with set up: Participants were told to press a button in the center of the screen which used to get refreshed, a multi touch set up. Experiment & Results 26
- 27. /32 Results Measured data: Completion Time Simultaneous Icons Translation Number of switches between overview and split view The result is consolidated in the next slide. Experiment & Results 27
- 28. /32 Experiment & Results – Completion Time 28
- 29. /32 Experiment & Results – Switches/Icons 29
- 30. /32 Limitations: Changing position of root nodes Pros: Multi Detailed View: More view at one place Multi comparison Evaluation 30
- 31. /32 Modifiable: Split screens can be modified according to personal needs viz., with the dimensions. Split View: Number of views can be increased. Future Work 31
Editor's Notes
- #6: Pinch error exists (H1) Error increases with device THICKNESS (H2) Device ANGLE (H3) Tilt around the horizontal left-to-right axis, and that the error is effected by TARGET (H4) The position at the back at which the pinch starts
- #8: Proprioception is the perception of positions and movements of the body segments in relation to each other, without the aid of vision, touch, or the organs of equilibrium
- #9: To measure users back to front pinch error we attached two 5 touch digitizers, each sensing up to five touch . Digitizer at the back is only used for measurement purposes. User was sitting at 1 m distance in front of a 23” screen while holding the protype with a particular thickness with both hands. Thickness 5 levels 4,2 ,10,15,20,30 Angle 0,40,70,90 10 targets . 30users age 21-58 , 4 user were left handed. 8 female participants.
- #12: On 4,2 mm thickness target was landing 99% right on backside It slightly diff on front side. For 30mm it was quite off from the target.
- #13: Thinner device lead more accurate pinching results .writer suggest 15mm is the idea. And don’t recommend above 15mm.
- #14: Reaching problem in large size. Combining with additional data, such as the position of hands and thumbs around the device, this could be used to feed machine learning algorithms to obtain a model that prevent the pinch error in software
- #15: Title is understanding back to front pinching for eyes free mobile touch input.
- #17: O+d is well know technique for data visualization . Detail view for contextual information Overview for magnified display
- #18: O+d have some limitation when we work on multiple regions of overview simultaneously. Compare thee use of different number of detailed view to interact with large graph . Two question . Are multiple detailed view better then one to interact with large graph. What is optimal number of detail views needed to perform task on large graph.
- #19: Consist in combining several displays usually tablets large display to visualize large context for example geographical data. Allow to move position of the detail in a view. Which is used in our technique. Distortion technique alow us to bring together two regions of a large space by folding them. it alow us to work simaltaniously on different region.
- #20: Mim map contain servral type of nodes and connections. There is unlimited number of nodes that can be connected.
- #21: O+d consist a large screen to display the contextual information and a tablet to show a magnified version of selected region of the large space.
- #22: Our technique alow user to have upto 4 independt split view.
- #25: Position of the split view on large screen is depend or translation view. No zoom is allowed.
- #27: 12 participant 4 femal everage age 26 year old. Pc and tablet 11 of them were right handed.
- #29: Using 2 and 4 view is faster then 1 view.
- #30: Participants used approximately the same number of views simultaneously , using 2 and 4 view