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Des stratégies pour gérer ou réduire l’occlusion.

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Presentation on theme: "Des stratégies pour gérer ou réduire l’occlusion."— Presentation transcript:

1 Des stratégies pour gérer ou réduire l’occlusion

2 Des stratégies pour réduire l’occlusion 1.Montrer moins de données 2.Utiliser la transparence 3.Réarranger des éléments (e.g. déformation) 4.Utiliser/modifier la caméra 5.Changer la méthode de projection (e.g. non- linéaire)

3 1. Show Less Data Slicing and Cutting; Boolean Masks: Extracted Subsets and Features: “Subsampling” (points, curves, surfaces) …

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8 2. Use Transparency Surfaces and volumes: Varying transfer functions

9 Importance-driven rendering [Viola et al. 2004] 3D magic lenses [Viega et al. 1996]

10 2½D and layer-based techniques: Macroscope [Lieberman 1997] Multiblending [Baudisch and Gutwin 2004] Free-space transparency [Ishak and Feiner 2004] [Harrison et al. 1996] [Gutwin et al. 2003]

11 3. Rearrange Elements 3D to 3D mappings –Exploded views, splitting open, peeling apart, etc.

12 2D to 2D mappings: focus+context, detail-in-context, fisheye distortion

13 Occlusion in 2D Elastic Windows [Kandogan and Shneiderman 1996] [Beaudouin-Lafon 2001] Piles [Mander et al. 1992] EdgeLens [Wong et al. 2003] [Bell and Feiner 2000]

14 Occlusion in 3D: Rigid Transformations

15 Agrawala et al. 2003Li et al Sonnet et al. 2004

16 Occlusion in 3D: Deformations Splitting Open: Soft & hardcover books [Carpendale et al. 1999] Discontinuous ray deflector [Kurzion and Yagel 1997] [Chen et al. 2003][Islam et al. 2004]

17 Skin peeled from hand [Laidlaw 1995] Occlusion in 3D: Deformations Peeling: Cutting and peeling virtual food [Owada 2005]

18 Occlusion in 3D: Deformations Radial distortions: Visual access distortion [Carpendale et al. 1997] Magnification lens [LaMar et al. 2001]

19 4. Use Camera Control StyleCam [Burtnyk et al. 2002] HoverCam [Khan et al. 2005]

20 5. Change Projection Method Flattening of Vascular Structures [Kanitsar et al. 2003] Nonlinear Virtual Colon Unfolding [Bartrolí et al. 2001] Sticky Camera [Singh and Balakrishnan 2004] [Singh 2002]

21 Strategies for Reducing Occlusion 1.Show Less Data 2.Use Transparency 3.Rearrange Elements (e.g. deformation) 4.Use Camera Control (e.g. “smart” cameras) 5.Change Projection Method (e.g. non-linear)

22 Exemple plus récent de l’approche #3 (déformation): McGuffin, Tancau, et Balakrishnan 2003

23 [McGuffin et al. 2003]

24 Our Browsing Tools 1.Hinge Spreader 2.Box Spreader 3.Sphere Expander 4.Leafer 5.Peeler 6.Radial Peeler

25 Techniques for Browsing Layers Compression Fanning Leafing Pulling out an individual layer Peeling Exploded view Flipping The layers to be browsed

26 1. Hinge Spreader

27 4. Leafer: Deck-of-Cards Metaphor

28 4. Leafer – other uses

29 5. Peeler

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31 Agur and Lee (1999), Grant’s Atlas of Anatomy


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