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Advanced Holographic Imaging Systems for 3D Vision and Immersive Display Applications

Presenter: Ziyang Chen

Supervised by Dr. Kaan Akşit and Dr. He Wang

Nov 27th, 2024, London

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Lensless camera

System Structure

Applications

Forward model

Reconstruction Algorithms

"Reflection in image sensor" by Steys is licensed under CC BY-SA 2.0

"Reflection in image sensor" by Steys is licensed under CC BY-SA 2.0

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Imaging system Structure

Conventional imaging system

C-M, CC BY-SA 3.0, via Wikimedia Commons

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Imaging system Structure

C-M, CC BY-SA 3.0, via Wikimedia Commons

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Imaging system Structure

Lensless imaging system

C-M, CC BY-SA 3.0, via Wikimedia Commons

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Why?

Complex optics & large form factor

Astrocog, CC BY-SA 3.0, via Wikimedia Commons

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Why?

Thick lens

人工知能, CC BY-SA 4.0, via Wikimedia Commons

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Why?

Single purpose & Visual privacy

IHazACatNamedMax, CC BY-SA 4.0, via Wikimedia Commons

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Lensless Camera Applications

Microscopy

[G. Kuo, F. L. Liu, I. Grossrubatscher, R. Ng, and L. Waller, “On-chip fluorescence microscopy with a random microlens diffuser,” Opt. Express 28, 8384–8399 (2020).]

[V. Boominathan, J. K. Adams, J. T. Robinson, and A. Veeraraghavan, “PhlatCam: designed phase-mask based thin lensless camera,” IEEE Trans. Pattern Anal. Mach. Intell. 42, 1618–1629 (2020).]

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Lensless Camera Applications

Thermal imaging

[. I. Reshetouski, H. Oyaizu, K. Nakamura, R. Satoh, S. Ushiki, R. Tadano, A. Ito, and J. Murayama, “Lensless imaging with focusing sparse URA masks in long-wave infrared and its application for human detection,” in Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)(2020), Vol. 12364 LNCS, pp. 237–253.]

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Lensless Camera Applications

3D imaging

[N. Antipa, G. Kuo, R. Heckel, B. Mildenhall, E. Bostan, R. Ng, and L.Waller, “DiffuserCam: lensless single-exposure 3D imaging,” Optica 5, 1–9 (2018).]

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3D vision - tracking

• Precision pose detection is demanded in personal fabrication, VR, and robotics.
• Conventional vision-based systems used in these systems often struggle with achieving high precision and accuracy

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Speckle

Holographic phenomenon where the phase and amplitude are random.

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Speckle

Simplified forward propagation of the laser light.

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SpecTrack

Information encoded in the speckle pattern.

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Current project

• Utilize this imaging system in immersive display systems (holographic display)
  • Image quality improvements
  • Simplify the calibration of the display