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STAGE INSTRUMENTAIRE MASTER 2 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO

Barcelonnette 10/2013. STAGE INSTRUMENTAIRE MASTER 2 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO. What?. Understand the basic principles of multi-view photogrammetry Learn the steps involved in the processing workflow

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STAGE INSTRUMENTAIRE MASTER 2 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO

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  1. Barcelonnette 10/2013 STAGE INSTRUMENTAIRE MASTER 23D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO

  2. What? • Understand the basic principles of multi-view photogrammetry • Learn the steps involved in the processing workflow • Get to know and handle a wide range of software (Visual SFM, Meshlab,…)

  3. Why? • Estimation of mass-balances is crucial for the understanding of mass-wasting processes (landslides, erosion) • Distribution of surface fissures influences hydrological processes (infiltration and drainage) and signal underlying mechanical processes • Image-based methods are can be cost-efficient and fast complements to LiDAR acquisitions, traditional topographic surveys, and traditional mapping • Relatively new techniques that sill need development and long-term evaluation for geomorphological investigations

  4. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO MULTIVIEW-STEREO - OVERVIEW

  5. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO STEP 1 – IMAGE ACQUISITION

  6. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 2 – Feature Detection

  7. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 3 – Feature MatCHING • From pairwise matches a network (graph) of image matches is obtained

  8. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 4 – Solve Geometry (SfM) R… Rotation C… Translation F… Focal length X… Coordinates STAGE INSTRUMENTAIRE MASTER II 10/2012

  9. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 4 – Solve Geometry (SfM) • Sparse point cloud and camera views

  10. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 4 – Solve Geometry (SfM)

  11. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 5 – Dense matching • Patch-wise iteration of 3D point generation (computational intensive!)

  12. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Step 5 – Dense matching • Patch-wise iteration of 3D point generation (computational intensive!) Point-cloud Surface-mesh Textured model

  13. 3D SURFACE RECONSTRUCTION WITH MULTIVIEW-STEREO Further STEPS • Scaling and georeferencing • Comparison with LiDAR STAGE INSTRUMENTAIRE MASTER II 10/2012

  14. Barcelonnette 10/2012 That’s all FOLKS!Practicals?

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