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A Framework for Multi-resolution and Multi-touch Systems

A Framework for Multi-resolution and Multi-touch Systems . 多重解析度及多重觸控互動系統之開發. Presenter: 胡婷婷. Advisor: 洪一平 教授. Outline. Introduction Related Work i -m- Top System i -m- Top SDK Application Conclusion & Future Work. Outline. Introduction Related Work i -m- Top System

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A Framework for Multi-resolution and Multi-touch Systems

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  1. A Framework for Multi-resolution and Multi-touch Systems 多重解析度及多重觸控互動系統之開發 Presenter: 胡婷婷 Advisor: 洪一平 教授

  2. Outline • Introduction • Related Work • i-m-Top System • i-m-Top SDK • Application • Conclusion & Future Work

  3. Outline • Introduction • Related Work • i-m-Top System • i-m-Top SDK • Application • Conclusion & Future Work

  4. Introduction • Motivation • Multi-resolution • Variable-resolution nature of human vision • Cost-effective large high-res display • Multi-touch • Intuitive interaction • Computer-vision based approach • Software Toolkit • Hide engineering challenges

  5. Introduction • i-m-Top • interactive multi-resolution tableTop • interactive: multi-touch • multi-resolution: fovea + peripheral projectors • i-m-Top SDK • Toolkit for rapid prototyping applications • Featured on multi-resolution/multi-touch

  6. Introduction • Overview Cams Image Processing Applications i-m-Top SDK Projectors Touch Detection Pan-tilt Unit Multimedia Other sensors User Interface

  7. Outline • Introduction • Related Work • i-m-Top System • i-m-Top SDK • Application • Conclusion & Future Work

  8. Related Work • Multi-Resolution Display • Fovea Plus Context • LCD screen (fixed) + projector Baudisch, P., Good, N., and Stewart, P. "Focus Plus Context Screens: Combining Display Technology with Visualization Techniques.“ In proceedings of ACM UIST '01

  9. Related Work • Multi-Resolution Display • Fovea-Tablett • Tablets as high-res displays • Tracked with visual marker • Multiple high-res is allowed • Cons: physical boundary J. Geisler, R. Eck, N. Rehfeld, E. Peinsipp-Byma, C. Schutz, and S. Geggus, “Fovea-tablette: A new paradigm for the interaction with large screens," in HCI (8), 2007

  10. Related Work • Software Development Toolkit • DiamondTouch SDK (C++) • Multi-touch, multi-user Esenther, A.; Forlines, C.; Ryall, K.; Shipman, S., "DiamondTouch SDK: Support for Multi-User, Multi-Touch Applications", ACM Conference on CSCW, 2002

  11. Related Work • Software Development Toolkit • DiamondSpin(Java): • Around-the-table interaction • Real-time polar to Cartesian transformation rotatable circular tabletop public + personal work areas Shen, C.; Vernier, F.D.; Forlines, C.; Ringel, M., "DiamondSpin: An Extensible Toolkit for Around-the-Table Interaction", CHI 2004

  12. Related Work • Software Development Toolkit • T3 (Java) • Multiple projectors → single high-res display • Mixed-presence collaboration Philip Tuddenham and Peter Robinson. “T3: Rapid Prototyping of High-Resolution and Mixed-Presence Tabletop Applications”, TABLETOP 2007.

  13. Outline • Introduction • Related Work • i-m-Top System • Hardware Configuration • Touch Detection • i-m-Top SDK • Application • Conclusion & Future Work

  14. i-m-Top System 96 ppi 24 ppi 56” Mirror Pan-tilt Unit Fovea Projector IR Camera Peripheral Projector IR Illuminator

  15. i-m-Top System

  16. i-m-Top System • Touch Detection finger palm Opening Background Subtraction Connected Component PCA Analysis Palm-finger Association Finger Fusion Finger Tracking - - Background Subtraction Connected Component PCA Analysis Palm Association Opening Opening Down- scale Connected Component Palm Tracking -

  17. Outline • Introduction • Related Work • i-m-Top System • i-m-Top SDK • Design Principles • Architecture • Implementation • Application • Conclusion & Future Work

  18. i-m-Top SDK • Design Principles • Efficient prototyping • Hide engineering details • Use metaphors • Provide reusable components • Touch-detection module independent • Vision-based & electronic-based approaches • Real-time requirement • Touch event handling + UI rendering • Extensibility • Integrate with other components

  19. i-m-Top SDK • Architecture Virtual Director Scene Scene Scene Scene Node Node View View Node Node Viewport / Virtual Camera Global Coordinate Position / Textures / Event Handlers / Animation Effects Node Virtual Camera (Fovea View) Node Virtual Camera (Peripheral View) Local Coordinate

  20. i-m-Top SDK • Architecture Application Projector Virtual Director Touch Detection Projector Message Parser Scene Device Control Socket Event queue Node View PTU Window Message Speaker Node Cam Other Sensors COM LED Light OpenGL c#

  21. i-m-Top SDK • Loop of virtual director Time spent 0 Affiliated Timer Functions Check Inputs Update States T Render Scenes Multimedia Output 1/fps-T Sleep 1/fps

  22. i-m-Top SDK • Sample Code • A scene with a photo • InitScenes( ){ • oScene scene = newoScene(); //construct a scene • director.AddScene(scene); //add scene to director • oView view = newView(0, 0, 1280, 720); //construct a view • scene.AddView(view); //add view to scene • oPhoto photo = newoPhoto(0,0,-100,640,480,”sun.png”); //construct a photo • scene.AddNode(photo); //add to scene • }

  23. i-m-Top SDK • Implementation • Multi-resolution Handling • Touch-event Processing • Reusable Components

  24. Implementation • Multi-resolution Handling • Calibration • Homography of fovea & peripheral projections • Run-time warping • Masking • Steerable fovea projection • Region/Object oriented • Multi-presented Information

  25. Implementation • Calibration • Homography of fovea & peripheral projections • Provide tools for manual calibration • Save homography/ center point /pan-tilt of PTU P2 P1 V1 V2 Y Y F1 F1 F2 F2 V1 V2 X V1 V2 X V3 V4 V3 V4 F3 F3 F4 F4 V3 V4 P3 P4

  26. Implementation • Calibration • Run-time warping • Adapt OpenGL rendering pipeline Warping Homography Matrix Model-View Matrix Projection Matrix Perspective Division Viewport Transformation Local coordinate Global coordinate Eye coordinate Clipping coordinate Window coordinate Normalized device coordinate

  27. Implementation • Masking fovea peripheral fovea

  28. Implementation • Masking • Find maximum region in fovea • Utilize Stencil buffer in OpenGL Apply arbitrary masks Set ‘0’ in mask regions Invert pixels in fovea region Set ‘1’ in the fovea region

  29. Implementation • Steerable Fovea Projection • Region-oriented • Spotlight on a specific region • Steered by finger gestures • Object-oriented • Spotlight on a specific object • Move with object • Real-time update • Steer the mirror • Retrieve homography • Apply mask

  30. Implementation • Multi-presented Information • Different content in fovea and peripheral regions • Eg. Google Map • Automatically change oRectanglemulti_presentation =newoRectangle(0, 0,-100, 200, 200); multi_presentation.LoadTexture(“context.png");//load low-resolution image multi_presentation.LoadHighTexture(“detail.png");//load high-resolution image

  31. Implementation • Touch-event Processing Touch events Touch Detection i-m-Top SDK Message Parser Virtual Director Node Receive Pass Check Dispatch Handle (by event handler)

  32. Implementation • Touch-event Processing • Receive & parse • Run on background threads • Pass to director • Gather all events in one detection frame before pass • if rendering rate < detection rate • Keep vital events: ‘Up’, ‘Down’ • Discard other events: ‘Move’ i-m-Top SDK Message Parser Virtual Director Node Pass Receive

  33. Implementation • Touch-event Processing • Check • ‘Down’: Test if hit some node • By SELECTION mode in OpenGL • If yes: add to TargetTable (event id → node) • ‘Move’, ‘Up’: Check if there is a target • Hit TargetTable by event id • ‘Up’: Remove from TargetTable • Dispatch • Dispatch events to each node i-m-Top SDK Message Parser Virtual Director Node Dispatch Check

  34. Implementation • Touch-event Processing • Define event handler • Node decides how to act • Default handler • Move/Scale/Rotate under ‘Move’ events • Redefine handler • InitScenes( ){ • //…… • //add new event handlers to the photo object • photo.MultiFingerEvent += newMultiFingerHandler(MyMultiFingerHandler); • photo.FingerClick += newFingerClickHandler(MyFingerClickHandler); • } i-m-Top SDK Message Parser Virtual Director Node Handle

  35. Implementation P3 P3 P1 P2 P4 P4 Translation: T Scaling: S P3 P3 P1 P34 Rotation: R P12 P2 P4 P4

  36. Implementation • Reusable components • Multimedia • Video/audio • Camera capture • UI components • Virtual keyboard • Text-pad • Button, scrollbar…

  37. Outline • Introduction • Related Work • i-m-Top System • i-m-Top SDK • Application • Conclusion & Future Work

  38. Application • Map Browser • Different content in the fovea & peripheral • Photo Browser • Object/Region oriented fovea projection • Emotion Player • Interactive art c

  39. Outline • Introduction • Related Work • i-m-Top System • i-m-Top SDK • Application • Conclusion & Future Work

  40. Conclusion • i-m-Top • Multi-resolution • Accommodating to human vision • Cost-effective large high-res display • Multi-touch • Intuitive interaction • i-m-Top SDK • Hide engineering challenges • Rapid prototyping applications • Investigating new interfaces / interactions

  41. Future Work • Attentive computing • Combine with gaze-tracking • 3D interaction • Surface to space • Auto calibration • Vision-based • Continuous pan-tilt / homographymap

  42. Thanks for your listening

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