![Steady State 4D
Impulse Response, 5D
[Raskar and Davis, 2007]
[Kajiya, 1986] [Seitz.., 2005]](https://image.slidesharecdn.com/lateef-150221060410-conversion-gate01/85/Femto-Photography-22-320.jpg)
![Inverting Light Transport
Multiple Scattering Direct/Global
Dual Photography
[Seitz , Kutulakos, Matsushita 2005] [Nayar, Raskar et al 2006]
[Sen et al 2005]
LIDAR
[Atcheson et al 2008]
[Kutulakos, Steger 2005]](https://image.slidesharecdn.com/lateef-150221060410-conversion-gate01/85/Femto-Photography-23-320.jpg)
![Steady State 4D
Impulse Response, 5D
[Raskar and Davis, 2007]
[Kajiya, 1986] [Seitz.., 2005]](https://image.slidesharecdn.com/lateef-150221060410-conversion-gate01/75/Femto-Photography-22-2048.jpg)
![Inverting Light Transport
Multiple Scattering Direct/Global
Dual Photography
[Seitz , Kutulakos, Matsushita 2005] [Nayar, Raskar et al 2006]
[Sen et al 2005]
LIDAR
[Atcheson et al 2008]
[Kutulakos, Steger 2005]](https://image.slidesharecdn.com/lateef-150221060410-conversion-gate01/75/Femto-Photography-23-2048.jpg)
Uploaded bySyed Lateef
Femto Photography
The document presents an overview of femto-photography and the underlying theories of light, discussing its properties as both particles and waves. It highlights the advances in imaging technologies, particularly the trillion frames per second capability, and applications in various fields like medical imaging and robotic navigation. Advantages such as capturing images around corners are contrasted with disadvantages including high costs and data blurring.
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Femto Photography
- 1. Seminar by Syed LateefUddin B110877EE S8 EEE
- 2. OVERVIEW • Introduction • LightTheory • Components of Femto photography • Streak Camera • Applications • Advantages and Disadvantages • Conclusion
- 3. Every Photon hasa Story
- 4. What is around thecorner ?
- 5. Can you look aroundthe corner ?
- 6. Can you look aroundthe corner ?
- 7.
- 8. • Light ismade up of little particles. • They obey the same laws of physics as other masses like baseballs and planets. • They are tiny so the particles in two intersecting beams do not scatter off each other. Isaac Newton 1643-1727 NEWTON’S PARTICLE THEORY OF LIGHT
- 9. • According toNewton’s first law, the light particle will continue moving in a straight line since no net force acts on it. • Near an interface the situation is different. Now there are more matter particles on one side than the other, and the light particle can experience a net force. It would experience a brief attractive force towards the medium with more matter particles. DRAWBACK OF NEWTON’S PARTICLE THEORY OF LIGHT REFRACTION PHENOMENON
- 10. • Foucault, inFrance, used a small steam turbine to spin a mirror at the rate of 800 rotations/sec(!) • This is a compelling example of how quickly a grand theoretical structure can collapse. All it takes is one decisive experiment like this one. • If there is no way to modify the theory to account for the new result, the theory must be abandoned. DRAWBACK OF NEWTON’S PARTICLE THEORY OF LIGHT Decisive Test of Particle Theory
- 11. WAVE THEORY OFLIGHT • A wave is a pattern, or shape, or disturbance, traveling through a medium. Christiaan Huygens 1629-1695 • Diffraction • Refraction • Interference
- 12. sin(i)/sin(r) = λi/λr = f λi/f λr =vi/vr REFRACTION PHENOMENONDIFFRACTION PHENOMENON
- 13. YOUNG TWO- SLITINTERFERENCE PATTERN
- 14.
- 15. DRAWBACK OF WAVETHEORY OF LIGHT • Couldn't justify the PHOTOELECTRIC EFFECT
- 16. QUANTUM THEORY OFLIGHT Max Planck 1858-1947 Wave-Particle Duality of Light • Quantum theory tells us that both light and matter consists of tiny particles which have wavelike properties associated with them. • Light is composed of particles called photons, and matter is composed of particles called electrons, protons, neutrons. • It's only when the mass of a particle gets small enough that its wavelike properties show up.
- 17. Trillion Frames perSecond Femto-Photography Light in Motion
- 18.
- 19. Trillion FPS ToF STREAKCAMERA = Inverse of CRO 1D camera: Single scan line stretched vertically in time ~2 ps resolution But for small samples in biochemistry Very accurate sync
- 20. Time-Image Time Profile for asingle pixel R
- 22. Steady State 4D ImpulseResponse, 5D [Raskar and Davis, 2007] [Kajiya, 1986] [Seitz.., 2005]
- 23. Inverting Light Transport MultipleScattering Direct/Global Dual Photography [Seitz , Kutulakos, Matsushita 2005] [Nayar, Raskar et al 2006] [Sen et al 2005] LIDAR [Atcheson et al 2008] [Kutulakos, Steger 2005]
- 27. dc a b e z x y Intensity (Arb.U.) Backprojected Intensity (Arb. U.) Confidence (Arb. U.)
- 30.
- 31. Collision avoidance, robotnavigation, …
- 32.
- 33.
- 34.
- 36. Sub - surfacescattering in fruit implies that it is ripe.
- 37. ADVANTAGES • High speedimaging. • Capturing pictures around corners. • Can see objects beyond the line of sight. DISADVANTAGES •Total recording time lengthens to approximately one hour. •Expensive setup. •Blurring in the data along the scanned dimension.
- 38. CONLUSION We should stopobsessing about the Megapixels in cameras and start focusing on next dimension in imaging... “Its about Time”.
- 39.  Femto-Photography: Capturingand Visualizing the Propagation of Light, Ramesh Raskar, MIT Media Lab.  NAIK,N.,ZHAO,S.,VELTEN,A.,RASKAR,R.,ANDBALA, K.2011.Single view reflectance capture using multiplexed scattering and time-of-flight imaging. ACMTrans.Graph.30,6, 171:1–171:10.  CAMPILLO,A.,ANDSHAPIRO,S.1987.Pico-second streak camera fluorometry : are view. IEEE Journal of Quantum Electronics 19,4,585–603.  www.wikipedia.org  web.media.mit.edu/~raskar/cornar/  web.media.mit.edu/~raskar//trillionfps/
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