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Lighting-up geometry: accurate 3D modelling with a torch and a camera

Explore a technique for acquiring high-resolution meshes through changing camera position and illumination, revealing fine geometric details with assumptions of Lambertian surface, isolated highlights, and single distant light source. Utilize surface evolution to obtain deformable 3D mesh, enabling full 3D geometry reconstruction of untextured objects.

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Lighting-up geometry: accurate 3D modelling with a torch and a camera

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  1. Lighting-up geometry: accurate 3D modelling with a torch and a camera George Vogiatzis, Carlos Hernández, Roberto Cipolla University of Cambridge, Toshiba Research

  2. Our technique • Aquire high-res mesh from images taken under changing camera position and illumination • Changing illumination uncovers fine geometric detail • Assumptions: • Lambertian surface, isolated highlights • Single, distant light-source • Silhouettes of object can be extracted

  3. Image Acquisition Setup

  4. In a nutshell: • Estimate light direction in each image • With known light directionscan estimate surface normals n from pixel intensities i • Integrate normals to get geometry n l i

  5. Light estimation • Calibration object • Fully known geometry • Light can be estimated from intensity of all points

  6. Light estimation • Visual hull

  7. Light estimation • Virtual calibration object • Partially known geometry • Light can be estimated from intensity of correct points

  8. Surface Evolution: Deformable 3D Mesh Evolve mesh until it is predicted appearance under recovered illumination matches images

  9. Results

  10. Results

  11. Results

  12. Results

  13. Results

  14. Results

  15. Results

  16. Advantages • Fully uncalibrated. Camera position and illumination are recovered from images alone • Low cost, practical and efficient alternative to laser range scanning • First image based method to obtain full 3D geometry of untextured objects

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