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3D-Modeling by Ortho-Image Generation from Image Sequence

3D-Modeling by Ortho-Image Generation from Image Sequence. Thorsten Thormahlen Hans-Peter Seidel Max Planck Institute for Computer Science, Saarbrucken, Germany. Outline. Abstract Introduction Related Work Method Results Conclusion. Abstract. What is Semi-automatic approach?

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3D-Modeling by Ortho-Image Generation from Image Sequence

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  1. 3D-Modeling by Ortho-Image Generation from Image Sequence Thorsten Thormahlen Hans-Peter Seidel Max Planck Institute for Computer Science, Saarbrucken, Germany

  2. Outline • Abstract • Introduction • Related Work • Method • Results • Conclusion

  3. Abstract • What is Semi-automatic approach? • Ortho-images can be imported as background maps in the orthographic views of any modeling package.

  4. Introduction • How to generate a 3D model of a real object? • Answer1:Laser Scan • expensive • Have problem with reflective , translucent, dark or colorful surface

  5. Answer2:Image-based modeling -Fully automatic approach -Semi-automatic approach • Taking a series of images or a video of the real object with camera • Recover the 3D information

  6. Related Work • Fully automatic approach -Shape-from-silhouette approach[Niem 1999] -Camera tracking[Pollefeys et al. 2004] • Semi-automatic approach -Photomodeler[Eos Systems 2005] -Facade system[Taylor et al. 1996] -Videotrace system[van den Hengel et al. 2007]

  7. Fully automatic approach • Shape-from-silhouette approach • Camera tracking+Multi-view stereo

  8. Semi-automatic approach • Photomodeler • Facade System -Mark corresponding points • Videotrace system

  9. Method Image sequence exsiting exsiting exsiting exsiting exsiting Camera tracker of choise Camera tracker of choise Camera tracker of choise Camera tracker of choise Camera tracker of choise Camera parameters and 3D point cloud New modules New modules New modules New modules Placement of Bounding box Ortho-image generation Orthographic projection exsiting exsiting exsiting Modeling package of choise Modeling package of choise 3D model

  10. Placement of the Bounding Box

  11. Ortho-Image Generation • Ortho-images without geometry

  12. Ortho-images with approximate geometry

  13. Using graph-cut for multi-view stereo

  14. Results (a)Frames from the input images (d)grayscale-coded depth (b)Generated ortho-images (e)Final 3D model that is modeled manually (c)color-coded index of the video frame

  15. Laser scan Ortho-image-based modeling Evalution

  16. (a)Original image sequence (d)Modeling of the glass (b)ortho-image (e)Rendering of the reconstructed model into the original image sequence (c)color-coded index

  17. Conclusion • Novel semi-automatic approach based on ortho-images can generate accurate 3D models • Workflow is easy to apply • Allow 3D reconstruction in more situations

  18. Manual intervention is kept to a minimum • Gives 3D modelers freedom

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