PowerPoint Presentation

Presented by : Nafees AhmedSupervised By : Dr. Shah Rukh Humayoun Input Techniques for Mobile

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Understanding Back-to-Front Pinching for Eyes-Free Mobile Touch Input2

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HaptiCasePhone protection case with tactile landmark at the back correspond the size and position of apposed touch screen

Overview3

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To Understand which factors lead to an ErrorDevice thicknessTilt angleTarget Location on the pinch error

Our Goal5

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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 starts5

Mapping ErrorUser may not map the location of the distant target to the back of the phone precisely, resulting in a mapping Error

Pinching ErrorsThumb and finger position may not match.

Errors6

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PinchPad: Performance of Touch-Based Gestures while Grasping Devicesfocuses on combining front and back device interaction on grasped devices, using touch-based gesturescombined two iPads together back-to-back and test touch-based interactionsLimitations 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 Work7

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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

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Two touch digitizers 5Shielding 2,0mmCardboard Slice 18gTactile landmarks5 Thickness 4 angles

Experiment Design

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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 0,40,70,9010 targets .30users age 21-58 , 4 user were left handed. 8 female participants.

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Results

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Collection of 18,000 pinches are studiedThree 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

Results10

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Results11

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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.

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Results12

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Thinner device lead more accurate pinching results .writer suggest 15mm is the idea. And dont recommend above 15mm.12

Didnt Vary the size of Digitizers

Future Work Learning algorithms Limitations13

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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

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Title of the paper doesnt clearly reflect the content of the paperThe location on the screen could properly touched with some practice and learning while trying to touch the respective location of the finger on the backOwn Evaluation14

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Title is understanding back to front pinching for eyes free mobile touch input.

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Investigating the Effects of Splitting Detailed Views in Overview+Detail Interface15

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Interfaces:Detail ViewOverview + Detail View(O+D)About16

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O+d is well know technique for data visualization .Detail view for contextual informationOverview for magnified display16

Need of Overview + Detail ViewDetails view cumbersomeDifficulty increased when working on multiple regions.

PurposeTo find of usability of Multiple view vis-a-vie Single viewTo support study with working via graphical nodes

Need & Purpose of Study17

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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.17

Topology of LinksDo not support simultaneous working viz., Multi display etc.Multi- ScreenHelps in case of large contexts such as geographical dataRotation of object position preferredMulti-Focus ScreenDistortion Technique usedMulti touch interaction help in folding data manifoldRelated Work18

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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. 18

Molecular Interaction Maps(MIM)Interaction technology Helps utilizing detailed viewsRelated Work (cont.)19

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Mim map contain servral type of nodes and connections.There is unlimited number of nodes that can be connected.19

O + D interface is deployed in design detailed view interface

Classified into three views:Split ViewHelps in understanding screen area and dividing it into partsOverviewTranslationRepresentation of positive view on overviewInterface Design20

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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.

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ViewsSplits a view further into sub views:1 view2 view4 view

Easy to focusSplit Views21

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Our technique alow user to have upto 4 independt split view. 21

Split Views

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Views:Displays the entire graph on larger displayRatios with Split Views:9 for 1 view configuration18 for 2 view configuration36 for 4 view configurationOverviews23

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Views:Translates overview of a split view into View Icon based on the positioning.Working with views:Position can be adjusted with direct screen manipulationMulti touch supportedTranslation View24

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Position of the split view on large screen is depend or translation view. No zoom is allowed.

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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 & Results26

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12 participant 4 femal everage age 26 year old. Pc and tablet11 of them were right handed.

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ResultsMeasured data:Completion TimeSimultaneous Icons TranslationNumber of switches between overview and split view

The result is consolidated in the next slide.

Experiment & Results27

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Experiment & Results Completion Time28

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Using 2 and 4 view is faster then 1 view.

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Experiment & Results Switches/Icons29

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Participants used approximately the same number of views simultaneously , using 2 and 4 view29

Limitations:Changing position of root nodes

Pros:Multi Detailed View:More view at one placeMulti comparison

Evaluation30

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Modifiable:Split screens can be modified according to personal needs viz., with the dimensions.

Split View:Number of views can be increased.

Future Work31

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THANK YOU ALL

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