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Interactive 3D Modeling Using Only One Image Sujin Liu and Zhiyong Huang School of Computing 1. Introduction Problem: for VR systems, to create the models, usually with irregular shapes the current CAD modeling software addressed different problems

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Interactive 3d modeling using only one image l.jpg

Interactive 3D Modeling Using Only One Image

Sujin Liu and Zhiyong Huang

School of Computing


1 introduction l.jpg
1. Introduction

  • Problem: for VR systems, to create the models, usually with irregular shapes

    • the current CAD modeling software addressed different problems

  • Ideas: study the use of human interaction and one image

    • balance the interaction and automation

VRST 2000


2 related work l.jpg
2. Related Work

  • Forward methods

    • CSG/B-Rep

      • Zeleznik et al.. SKETCH. SIGGRAPH 96

      • Igarashi et al. Teddy. SIGGRAPH 99

    • Implicit Surfaces

      • Shen and Thalmann. Metaball Human, Implicit Surfaces 95

    • Production systems

      • Sakaguchi and Ohya. Botanical Tree. VRST 99

VRST 2000


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  • Reverse methods

    • Computational Geometry based

      • Edelsbrunner and Mucke, 3D Alpha Shapes. TOG 94

      • Hoppe et al. Curless and Levoy. Zero-set. SIGGRAPH 92, SIGGRAPH 96

      • Amenta et al. Crust.SIGGRAPH 99

      • Turner et al., Line Drawing Interpretation, VRST 99

    • Model based

      • Thalmann and Thalmann. Human.IEEE CG&A 87

      • Pighin et al. Face.SIGGRAPH 98

      • Lee et al. Face.Eurographics 00

VRST 2000


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  • Hybrid method

    • Debevec et al. Façade.SIGGRAPH 96

  • Other one image based method

    • Beymer and Poggio. Face Recognition. ICCV 95

    • Horry et al. TIP (Tour Into Picture).SIGGRAPH 97

VRST 2000


3 our work l.jpg
3. Our Work

One 2D image

Photogrammetric Modeling

3D model

Human Interaction

Texture Mapping

VRST 2000


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Photogrammetric Modeling

  • Purpose: to achieve automation by exploring the use of one image

  • Major steps:

    • Contour extraction

    • 2D skeleton computation

    • 2D meshing

    • 3D meshing

    • Texture mapping

VRST 2000


Contour extraction l.jpg
Contour Extraction

  • Using the color clustering

    • the algorithm classifies the pixels into different clusters by comparing result of the color threshold of each cluster

    • Two clusters: foreground and background

      • the foreground is distinguishable from the background by colors

      • not necessary a pure color background

VRST 2000


Example l.jpg
Example

VRST 2000


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2D Skeleton Computation

  • Purpose: to derive the skeleton of the 2D shape

  • The algorithm is based on the feature tracking and minimal spanning tree

    • KLT feature tracking: derive the feature points of the image

    • Minimal spanning tree: derive the skeleton of the 2D shape

VRST 2000


Example11 l.jpg
Example

VRST 2000


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2D Meshing

  • Purpose: to derive a 2D mesh of the shape using the skeleton and contour

  • A variation of the constrained Delaunay triangulation, Qhull

    • http://www.geom.umn.edu/software/qhull/

VRST 2000


Example13 l.jpg
Example

VRST 2000


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3D Meshing

  • Purpose: to derive the 3D mesh as an initial shape of the model

  • Intuition: lift the 2D mesh with different heights for every vertices

    • Height is estimated by the color intensity

    • Requires human interaction most

VRST 2000


Example15 l.jpg
Example

VRST 2000


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  • Two problems

    • Resolution decreases

      • similar to Teddy

    • Back meshing

      • human interaction

VRST 2000


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Texture Mapping

  • Straight forward for the front mesh

    • each vertex of the 3D mesh has its texture coordinate in photogrammetrc modeling

  • Problem for the back mesh

    • human interaction

VRST 2000


Example18 l.jpg
Example

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Other Human Interaction

  • Common to any modeling systems

    • picking, grouping, adding, deleting, displacing, etc.

VRST 2000


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Summary

  • A hybrid modeling framework

    • requires human interaction

    • has automations from the use of one image

    • not a stereo vision

    • not a model-based

VRST 2000



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5. Conclusion and Future Work

  • We have proposed and implemented a hybrid modeling frame work using only one image

  • Future work: to address more general shapes

VRST 2000


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6. Acknowledgement

  • Dr. Leow Wee Kheng, Zhang Yong

  • NUS Academic Research Grant RP3982704

VRST 2000


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