Distortion-Correction Method Based on Angular Spectrum Algorithm for Holographic Display

He, Zongling; Sui, Xiaomeng; Jin, Guofan; Cao, Liangcai

doi:10.1109/tii.2019.2906642

Cited by 19 publications

(4 citation statements)

References 26 publications

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“…The -1-order image is then shifted to the origin in the frequency domain to rectify the off-axis angle. Subsequently, the angular spectrum algorithm [ 26 ] is utilized to propagate the diffracted light field to the image plane, rectifying the reconstruction error induced by defocusing. The propagation distance is determined through an auto-focusing algorithm [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

Dynamic tracking of onion-like carbon nanoparticles in cancer cells using limited-angle holographic tomography with self-supervised learning

Liu,

Xiao,

Xiao

et al. 2024

Biomed. Opt. Express

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This research presents a novel approach for the dynamic monitoring of onion-like carbon nanoparticles inside colorectal cancer cells. Onion-like carbon nanoparticles are widely used in photothermal cancer therapy, and precise 3D tracking of their distribution is crucial. We proposed a limited-angle digital holographic tomography technique with unsupervised learning to achieve rapid and accurate monitoring. A key innovation is our internal learning neural network. This network addresses the information limitations of limited-angle measurements by directly mapping coordinates to measured data and reconstructing phase information at unmeasured angles without external training data. We validated the network using standard SiO2 microspheres. Subsequently, we reconstructed the 3D refractive index of onion-like carbon nanoparticles within cancer cells at various time points. Morphological parameters of the nanoparticles were quantitatively analyzed to understand their temporal evolution, offering initial insights into the underlying mechanisms. This methodology provides a new perspective for efficiently tracking nanoparticles within cancer cells.

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Section: Methodsmentioning

confidence: 99%

Dynamic tracking of onion-like carbon nanoparticles in cancer cells using limited-angle holographic tomography with self-supervised learning

Liu,

Xiao,

Xiao

et al. 2024

Biomed. Opt. Express

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show abstract

“…Usually, aberrations are analyzed using specific formulae [6][7] or by numerical predistortion of an input image based on estimated distortion coefficients [8]. Other numerical correction methods have been utilized to detect and correct camera and SLM distortions [9], to compensate for aberrations in large adjustable focal distances [10], and to evaluate the commercial ray-tracing software known as Zemax [11]. Holographic NEDs commonly exhibit limited eyebox sizes.…”

Section: Introductionmentioning

confidence: 99%

Eye-box expanded lens less holographic near-eye display based on single spatial light modulator and holographic optical element

Dashdavaa,

Erdenebat,

Hossain

et al. 2024

Practical Holography XXXVIII: Displays, Materials, and Applications

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In this paper, we expand the eyebox size of lens-less holographic near-eye-display (NED) using passive eyebox replication technique that incorporates the spatial light modulator (SLM) and a holographic optical element (HOE). In holographic NEDs, the space-bandwidth product (SBP) of the SLM determines the exit pupil dimensions and corresponding eyebox size. The base eyebox is replicated in horizontal direction by using the horizontal high-order diffractions of the SLM under spherical wave illumination and multiplexed HOE combiner. The HOE combiner is used as a see-through reflective screen for the projected holographic virtual image, and it is fabricated based on two spherical divergent waves recording condition. When a digital blazed grating and a digital lens phase are added to the computed phase hologram sent to the SLM, two spatially separated, horizontal high-order diffraction terms with identical intensity and information can be used for eyebox expansion. When the eyebox size is expanded, the field-of-view (FOV) is not sacrificed; spherical divergence wave illumination alleviates the need for a tradeoff between FOV and eyebox size. Astigmatism distortion introduced during the HOE fabrication was counterbalanced by pre-correcting the target image using a computer-generated, holographic computation algorithm. The experimental results prove that the proposed prototype system is simple and effective to achieve distortion-free reconstruction of 3D virtual image and eyebox extension of lens less holographic NED.

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“…The proposed concept contains both a light source design for generating a mutually coherent multi-directional wave and a CGH optimization framework for reconstructing crosstalk-free signals. In order to increase the image quality of holographic display, various types of CGH synthesis algorithm based on optical aberration correction has been used 26 – 28 . The proposed CGH optimization algorithm also considers real-world artifacts such as chromatic wavelength difference, optical aberrations, and system misalignment.…”

Section: Introductionmentioning

confidence: 99%

Expanding energy envelope in holographic display via mutually coherent multi-directional illumination

Lee

Bang

Nam

et al. 2022

Sci Rep

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Holographic display is considered as the most promising three-dimensional (3D) display due to its unique feature of reconstructing arbitrary wavefronts. However, the limited étendue, which hinders the immersive experience of observers, remains a major unresolved issue in holographic display technique. In this paper, we propose a novel approach to tweak the constraints of étendue by expanding the energy envelope in holographic display via mutually coherent multi-illumination. The proposed concept contains both a light source design for generating a mutually coherent multi-directional wave and a computer-generated hologram optimization framework for providing high-resolution 3D holograms. To verify the proposed approach, a benchtop prototype of a holographic near-eye display providing an intrinsic large exit-pupil is implemented. The experimental results clearly show that the exit-pupil is effectively expanded by four times and an appropriate viewpoint image is reconstructed according to the view position.

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Distortion-Correction Method Based on Angular Spectrum Algorithm for Holographic Display

Cited by 19 publications

References 26 publications

Dynamic tracking of onion-like carbon nanoparticles in cancer cells using limited-angle holographic tomography with self-supervised learning

Dynamic tracking of onion-like carbon nanoparticles in cancer cells using limited-angle holographic tomography with self-supervised learning

Eye-box expanded lens less holographic near-eye display based on single spatial light modulator and holographic optical element

Expanding energy envelope in holographic display via mutually coherent multi-directional illumination

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