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Micro Phase Shifting 2014-07-01 Se-Hoon, Park -Mohit Gupta and Shree K. Nayar, CVPR2012.

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Presentation on theme: "Micro Phase Shifting 2014-07-01 Se-Hoon, Park -Mohit Gupta and Shree K. Nayar, CVPR2012."— Presentation transcript:

1 Micro Phase Shifting Se-Hoon, Park -Mohit Gupta and Shree K. Nayar, CVPR2012

2 2 Real-Time Compressive Tracking Contents Phase shifting Phase shift encoding Phase shift decoding Issue Inter reflection Micro Phase shifting Disambiguation experiments

3 Phase shifting  Phase shift encoding Three image structured light I1(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y) - 2π/3] I2(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y)] I3(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y) + 2π/3] I1(x,y) : first imageI2(x,y) : seond imageI3(x,y) : third image I’(x,y) : average intensityI’’(x,y) : intensity modulationθ(x,y) : phase

4 Phase shifting  Phase shift encoding Ex) I’(x,y) = 125 I’’(x,y) = 125 I1(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y) - 2π/3] I2(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y)] I3(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y) + 2π/3] θ(x,y)I1(x,y)I2(x,y)I3(x,y) π/ π/ π/ π/ π/ π 1870

5  Phase shift encoding Phase shifting 55 I1I2I3

6 Phase shifting I1(x,y)I2(x,y)I3(x,y)θ(x,y) π/ π/ π/ π/ π/ π

7 Phase shifting  Phase shift decoding Camera image Projector image

8  Phase shift decoding –If the noise is same in the three camera images, noise doesn’t matter. Phase shifting 8

9 9 pixel pixel θ (π) θ (π) Input phase output phase ambiguous I1(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y) - 2π/3] I2(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y)] I3(x,y) = I’(x,y) + I’’(x,y)cos[θ(x,y) + 2π/3] Input phase Output phase

10 Phase shifting 10 frequency (  ) amplitude Broad Frequency Band  max  mean  min Unambiguous but Noisy Accurate but Ambiguous

11  Inter reflection Issue 11 camera projector Inter reflections P Q R time Inter reflections Direct Radiance radiance scene

12  Inter reflection Issue 12 camera projector Inter reflections P Q R time Inter reflections Direct Radiance radiance scene Phase Error

13  Inter reflection Issue 13 camera projector Inter reflections P Q R scene Inter reflection Illumination pattern light transport coefficients

14  Inter reflection Issue 14 camera projector Inter reflections P Q R scene Inter reflection Illumination pattern light transport coefficients

15  Inter reflection Issue 15 camera projector Inter reflections P Q R scene Inter reflection Illumination pattern light transport coefficients

16  Inter reflection Issue 16 camera projector Inter reflections P Q R scene Inter reflection Illumination pattern light transport coefficients N

17  Inter reflection Issue 17 Inter reflection * illumination patternlight transport coefficients pixels

18  Inter reflection Issue 18 frequency projected patterns Inter reflection illumination patternlight transport coefficients

19  Inter reflection Issue 19 frequency projected patterns Inter reflection illumination patternlight transport coefficients Micro phase shifting

20 Micro Phase shifting 20  max  mean  min frequency (  ) amplitude How Can We Disambiguate Phase Without Low Frequency Patterns?

21 Micro Phase shifting 21 number of periods (unknown)  Phase disambiguation

22 Micro Phase shifting 22 unknownknownunknownknownunknownknown

23 Micro Phase shifting 23

24 Micro Phase shifting 24  Experiments –Ceramic bowl

25 Micro Phase shifting 25  Experiments –Ceramic bowl point projector

26 Micro Phase shifting 26  Experiments –Ceramic bowl Conventional Phase Shifting Micro Phase Shifting [Our]

27 Micro Phase shifting 27  Experiments –Lemon point projector subsurface scacttering

28  Experiments –Lemon Micro Phase shifting 28 Conventional Phase Sh ifting Micro Phase Shifting [Our]

29  Experiments –Shiny Metal Bowl Micro Phase shifting 29

30  Experiments –Shiny Metal Bowl Micro Phase shifting 30 Conventional Phase Shi fting Micro Phase Shifting [Our]


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