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Agile Spectrum Imaging

Agile Spectrum Imaging. Ankit Mohan, Jack Tumblin Northwestern University. Ramesh Raskar MERL / MIT. CIE 1931 chromaticity diagram. Fixed color primaries. sRGB color space. G. Fuji Velvia 50 film. Nikon D70 camera. R. B. Outside the color gamut. G. R = ? G = ? B = ?. R. B.

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Agile Spectrum Imaging

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  1. Agile Spectrum Imaging Ankit Mohan, Jack Tumblin Northwestern University Ramesh Raskar MERL / MIT

  2. CIE 1931 chromaticity diagram

  3. Fixed color primaries sRGB color space G Fuji Velvia 50 film Nikon D70 camera R B

  4. Outside the color gamut G R = ? G = ? B = ? R B

  5. Colorimetric or Photometric mapping G R ≈ 0.0 G ≈ 0.2 B ≈ 0.8 R B

  6. 400nm 550nm 700nm Wider color gamut G λ “Best” primaries compromise: Wide Gamut vs. High Power R B

  7. Adaptive Color Primaries

  8. Agile Spectrum • How do we do this? • What new applications can we get?

  9. I x Ix λ 400nm 550nm 700nm Arbitrary white 1D signal C A B

  10. x I I x Pinhole Camera C A’ B B’ A C’ Object Image Pinhole

  11. x I C A’ B B’ C’ A Object Lens L1 Pinhole

  12. x I C A’ B’ B C’ A Object Lens L1 Prism Pinhole

  13. Prism λ A’ λ B’ x λ λ C’ x Spectral Light-Field

  14. Light-Field Placing a 1D screen in a 2D light-field gives a 1D projection in a direction perpendicular to the screen.

  15. x I Prism λ A’ λ B’ λ λ C’ x x I Screen p

  16. x I λ A’ λ B’ λ λ C’ x I p

  17. x I t = ∞ Prism p λ A’ λ B’ λ λ C’ I x t

  18. x C’’ B’’ I A’’ Lens L2 Prism λ A’ λ B’ x λ C’ tS

  19. x C’’ B’’ I A’’ Lens L2 λ A’ λ B’ x λ C’ tS t

  20. x C’’ B’’ I A’’ Lens L2 λ A’ λ B’ x λ C’ tS tR t

  21. C’’ B’’ A’’

  22. I p Sensor plane (t=ts) C’’ B’’ λ x A’’ tS t

  23. Rainbow plane (t=tR) p C’’ All rays of the a given wavelength, from all points in the scene, converge to a unique point in the R-plane. B’’ λ I x A’’ tR t

  24. I x Ix λ 400nm 550nm 700nm Rainbow plane (t=tR) p λ I x

  25. I x Rainbow plane (t=tR) p λ Ix λ I x 400nm 550nm 700nm

  26. Rainbow plane (t=tR) p I x λ IR λ I x 400nm 550nm 700nm IB λ 400nm 550nm 700nm

  27. Rainbow plane (t=tR) C’’ λ position B’’ A’’ tR t

  28. Mask in the Rainbow plane C’’ λ x B’’ X 0 A’’ λ 1 tR t x

  29. Mask in the Rainbow plane C’’ 0 B’’ λ x A’’ tR t

  30. I p Mask in the Rainbow plane C’’ 0 B’’ λ x A’’ tR tS t

  31. I p Mask in the Rainbow plane C’’ 0 B’’ λ x A’’ tR tS t

  32. I p Mask in the Rainbow plane C’’ B’’ λ 0 x A’’ tR tS t

  33. I p Mask in the Rainbow plane C’’ 0 B’’ λ 0 x A’’ tR tS t

  34. Rainbow plane (t=tR) Control the spectral sensitivity of the sensor by placing an appropriate grayscale masks in the R-plane. C’’ B’’ A’’ tR tS t

  35. Pinhole Sensor Lens L2 Lens L1 Scene C’’ A’ C B’ B B’’ C’ A A’’ R-plane mask Prism orDiffraction Grating

  36. Pinhole Lens L1 Sensor Lens L2 Lens L1 Scene R-plane mask Prism orDiffraction Grating

  37. Aperture and Lens L1 Sensor Lens L2 Scene R-plane mask Prism orDiffraction Grating

  38. DiffractionGrating R-plane mask Lens L1 Lens L2 Sensor

  39. Test Setup Spectral rainbow generator Agile Spectrum Camera

  40. m(λ) λ 400nm 550nm 700nm m(λ) λ 400nm 550nm 700nm m(λ) λ 400nm 550nm 700nm Two opaque stripes No Mask One opaque stripe

  41. m(λ) λ 400nm 550nm 700nm

  42. m(λ) λ 400nm 550nm 700nm

  43. DiffractionGrating R-plane mask Lens L1 Lens L2 Screen

  44. Metamers White Illumination Monochromatic Illumination

  45. Traditional three primary projector Agile-spectrumprojector

  46. Traditional three primary projector Py time

  47. Traditional three primary projector Py time

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