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Lensless Imaging with A Controllable Aperture

Lensless Imaging with A Controllable Aperture. Assaf Zomet and Shree K. Nayar Columbia University. IEEE CVPR Conference June 2006, New York, USA. Plane in focus. Aperture. Image Detector. Cameras Today. Lens. Our Lensless Camera. Volumetric . Attenuating Aperture. Image Detector.

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Lensless Imaging with A Controllable Aperture

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  1. Lensless Imaging with A Controllable Aperture Assaf Zomet and Shree K. Nayar Columbia University IEEE CVPR Conference June 2006, New York, USA

  2. Plane in focus Aperture Image Detector Cameras Today Lens

  3. Our Lensless Camera Volumetric Attenuating Aperture Image Detector

  4. Layered Aperture Multilayer Aperture Image Detector Attenuating apertures: Farid&Simoncelli ‘97, Nayar&Branzoi ‘03

  5. Implementation Camera body Aperture: LCD LCD Control

  6. Attenuating Layer Pinhole Image Detector Controllable Pinhole Attenuating Layer Pinhole Image Detector

  7. Controllable Pinhole: Video

  8. Sharpness and brightness increase with FOV (image center). Limitations of Lensless Imaging Optimal pinhole (Raleigh): Brightness: f-number

  9. Sharpness and brightness increase with FOV (image center). f and detector larger by factor k: Resolution/brightness by . Limitations of Lensless Imaging Optimal pinhole (Raleigh): Brightness: f-number

  10. Collecting More Light: Coded Apertures Zand, 1992

  11. Conventional View Desired View

  12. Fov 2 Fov 1 Fov 3 Split Field of View: Implementation Attenuating Layers (2nd layer physical) Pinhole Image Detector

  13. Split Field of View: Results Lens camera Our camera

  14. Split Field of View: Video

  15. Wasted pixels Finding Faces

  16. Finding Faces

  17. Pinhole Attenuating Layers (2nd layer physical) Split Image: Computational Camera Correlation pattern Image Detector

  18. Lens camera Normalized correlation: Image Pattern Computations in the Optics Our camera Correlation Pattern Noncoherent optical processing (Rogers 1977)

  19. A Camera as a Mapping Camera Optics

  20. Imaging Formulation: One Layer f

  21. Imaging Formulation: Multilayer fj

  22. Varying Zoom Conventional view L H L L H Desired view L

  23. Varying Zoom Mapping Scene Desired view MX and MXare impossible to implement with 3 layers

  24. Fov 2 Varying Zoom: Imaging (simulation) Captured Fov 1 Fov 3 Desired Attenuating Layers Pinhole Pinhole Pinhole Image Detector

  25. Varying Zoom: Reconstruction Icapturted Icomputed

  26. Summary Controllable Pinhole Split Field of View Computational Camera Spatially Varying Zoom Programmable cameras, Nayar, Branzoi & Boult 2004

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