Encrypted Three-dimensional Dynamic Imaging using Snapshot Time-of-flight Compressed Ultrafast Photography

Liang, Jinyang; Gao, Liang; Hai, Pengfei; Li, Chiye; Wang, Lihong V.

doi:10.1038/srep15504

Cited by 59 publications

(42 citation statements)

References 39 publications

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“…Single-shot real-time video recording of light scattering dynamics is a significant contribution of the nextgeneration of imaging modalities. For example, by leveraging the time-of-flight light signal, the technology can resolve depth information without motion blurring [31]. Coupling the current system with a femtosecond streak camera [39] …”

Section: Discussionmentioning

confidence: 99%

“…In previously reported CUP systems [30][31][32], only the "ON" pixels of the DMD were used in the spatial encoding operation. As a result, information that landed on the "OFF" pixels of the DMD was lost, compromising reconstruction quality.…”

Section: Comparison To Previous Cup Systemsmentioning

confidence: 99%

“…As a result, information that landed on the "OFF" pixels of the DMD was lost, compromising reconstruction quality. In addition, the time-integrated CCD image was simply overlaid with the reconstructed datacube as a postprocessing step [31], without adding new information to assist image reconstruction. In contrast, G2-CUP harvests light reflected from both the "ON" and "OFF" pixels of the DMD, forming two complementary time-sheared views.…”

Section: Comparison To Previous Cup Systemsmentioning

confidence: 99%

“…We developed a second-generation compressed ultrafast photography (G2-CUP) system, whose more efficient hardware design and reconstruction paradigm surpass the performance of previous CUP systems [30][31][32]. At 100 billion frames per second, G2-CUP macroscopically imaged the evolution of the light intensity distribution of a picosecond laser pulse propagating in a thin scattering plate assembly that contains two materials with different refractive indices.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast imaging of light scattering dynamics using second-generation compressed ultrafast photography

Liang

Zhu

et al. 2017

SPIE Proceedings

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We present single-shot real-time video recording of light scattering dynamics by second-generation compressed ultrafast photography (G2-CUP). Using G2-CUP at 100 billion frames per second, in a single camera exposure, we experimentally captured the evolution of the light intensity distribution in an engineered thin scattering plate assembly. G2-CUP, which implements a new reconstruction paradigm and a more efficient hardware design than its predecessors, markedly improves the reconstructed image quality. The ultrafast imaging reveals the instantaneous light scattering pattern as a photonic Mach cone. We envision that our technology will find a diverse range of applications in biomedical imaging, materials science, and physics.

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Section: Discussionmentioning

confidence: 99%

Section: Comparison To Previous Cup Systemsmentioning

confidence: 99%

Section: Comparison To Previous Cup Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrafast imaging of light scattering dynamics using second-generation compressed ultrafast photography

Liang

Zhu

et al. 2017

SPIE Proceedings

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“…The quantum nature of light has also been explored as a security key in quantum communications 20,21 . Recently, various approaches have been reported for the optical encryption of 3D objects at the macroscopic scale (millimeters, centimeters to meters) [22][23][24][25][26][27][28][29][30][31] . However, the existing methods are ineffective at the microscopic scale, despite the ever-growing demand in this regime.…”

mentioning

confidence: 99%

Volumetric Light-field Encryption at the Microscopic Scale

Guo

Muniraj

et al. 2017

Frontiers in Optics 2017

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We report a light-field based method that allows the optical encryption of three-dimensional (3D) volumetric information at the microscopic scale in a single 2D light-field image. The system consists of a microlens array and an array of random phase/amplitude masks. The method utilizes a wave optics model to account for the dominant diffraction effect at this new scale, and the system pointspread function (PSF) serves as the key for encryption and decryption. We successfully developed and demonstrated a deconvolution algorithm to retrieve both spatially multiplexed discrete data and continuous volumetric data from 2D light-field images. Showing that the method is practical for data transmission and storage, we obtained a faithful reconstruction of the 3D volumetric information from a digital copy of the encrypted light-field image. The method represents a new level of optical encryption, paving the way for broad industrial and biomedical applications in processing and securing 3D data at the microscopic scale.The ever-increasing amount of information that individuals and organizations are storing, processing and analyzing drives the demand for information security technologies. Various such techniques, including steganography, cryptography and digital watermarking, have been used to enhance the security and privacy of data 1-3 . Since the inception of double random phase encoding (DRPE) 4 , optical technologies have demonstrated remarkable advantages compared to other encryption methodologies. These advantages include system flexibility, multi-dimensional capabilities, and high encryption density with optical signal processing [5][6][7] . Optical systems exhibit an inherent parallel-processing nature, operating on the incident information without the need to sequentially process data [5][6][7] . The rapid development of optical cryptosystems takes advantage of the many degrees of freedom available with both real and phase-space optical parameters, such as amplitude, polarization, wavelength, and phase [8][9][10][11][12][13] . Several optical encryption techniques employing variations of the classical Fourier transform based DRPE system have been further developed, including Fresnel transform (FST), Fractional Fourier transform (FRT), Hartley Transform (HT), Gyrator Transform (GT), and Linear Canonical Transform (LCT) [14][15][16][17][18][19] . The quantum nature of light has also been explored as a security key in quantum communications 20,21 . Recently, various approaches have been reported for the optical encryption of 3D objects at the macroscopic scale (millimeters, centimeters to meters) [22][23][24][25][26][27][28][29][30][31] . However, the existing methods are ineffective at the microscopic scale, despite the ever-growing demand in this regime. This challenge is mainly caused by two factors. First, in macroscopic scenes, the light-field information can be effectively analyzed using geometrical optics, but because diffraction now plays a crucial role, a wave optics model must be considered in the recordin...

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Single‐Shot Ultraviolet Compressed Ultrafast Photography

Lai

Xue

Côté

et al. 2020

Laser & Photonics Reviews

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Compressed ultrafast photography (CUP) is an emerging potent technique that allows imaging a nonrepeatable or difficult-to-produce transient event in a single shot. Despite many recent advances, existing CUP techniques operate only at visible and near-infrared wavelengths. In addition, spatial encoding via a digital micromirror device (DMD) in CUP systems often limits its field of view and imaging speeds. Finally, conventional reconstruction algorithms have limited control of the reconstruction process to further improve the image quality in the recovered (x, y, t) datacubes of the scene. To overcome these limitations, this article reports a single-shot UV-CUP that exhibits a sequence depth of up to 1500 frames with a size of 1750 × 500 (x, y) pixels at an imaging speed of 0.5 trillion frames per second. A patterned photocathode is integrated into a streak camera, which overcomes the previous restrictions in DMD-based spatial encoding and improves the system's compactness. Meanwhile, the plug-and-play alternating direction method of multipliers algorithm is implemented to CUP's image reconstruction to enhance reconstructed image quality. UV-CUP's single-shot ultrafast imaging ability is demonstrated by recording UV pulses transmitting through various spatial patterns. UV-CUP is expected to find many applications in both fundamental and applied science.

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Encrypted Three-dimensional Dynamic Imaging using Snapshot Time-of-flight Compressed Ultrafast Photography

Cited by 59 publications

References 39 publications

Ultrafast imaging of light scattering dynamics using second-generation compressed ultrafast photography

Ultrafast imaging of light scattering dynamics using second-generation compressed ultrafast photography

Volumetric Light-field Encryption at the Microscopic Scale

Single‐Shot Ultraviolet Compressed Ultrafast Photography

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