Recent developments in computer-generated holography: toward a practical electroholography system for interactive 3D visualization

Slinger, Christopher W.; Cameron, Colin; Coomber, Stuart D.; Miller, Richard J.; Payne, Doug; Smith, Allan P.; Smith, Martin Ferguson; Stanley, Maurice; Watson, Philip J.

doi:10.1117/12.526690

Cited by 57 publications

(18 citation statements)

References 13 publications

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“…1 In recent years, various technologies have been developed for holographic 3D projection. However, there are still two main problems hindering the realtime applications of state-of-art holographic 3D projection: one is the enormous computational time, 2 and the other is the limited size and viewing zone of the reconstructed 3D optical image due to the limitations of the total size and its pixel pitch of the SLM. [3][4][5] As is well known, higher resolution and smaller pixel pitch of the SLM on which the hologram is loaded will lead to a larger viewing zone and a bigger size of the 3D reconstructed image.…”

Section: Introductionmentioning

confidence: 99%

Magnification of three-dimensional optical image without distortion in dynamic holographic projection

et al. 2011

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We propose a simple technique to enlarge the reconstructed three-dimensional (3D) optical image and shorten the reconstructed distance simultaneously in real time holographic projection using a conventional lens or concave reflecting mirror based on the optical reversibility theorem. The main factors causing the longitudinal and transversal distortions of a 3D enlarged optical image are analyzed, and the 3D optical images are enlarged where severe distortions are precompensated by constructing objects with distortions directly instead of computing the precompensated phase iteratively so that it does not increase the computing time. Numerical simulations and optical experiments are performed for magnifying a simple cubic model. The results show that a 3D enlarged optical image is achieved successfully without any distortion and the reconstructed distance is shortened simultaneously. It is believed that this proposed technique is useful for 3D real time holographic projection in the future. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).Subject terms: computer holography; holographic display; magnification of threedimensional image size; distortion of the image; compensation of the distortion. Paper 110845R IntroductionHolographic three-dimensional (3D) display is a promising technology in true 3D display. It can produce virtual 3D images by looking directly into the spatial light modulators (SLMs) or real images by reconstructing on a frosted glass plate or a thick Agarose gel. 1 In recent years, various technologies have been developed for holographic 3D projection. However, there are still two main problems hindering the realtime applications of state-of-art holographic 3D projection: one is the enormous computational time, 2 and the other is the limited size and viewing zone of the reconstructed 3D optical image due to the limitations of the total size and its pixel pitch of the SLM. 3-5 As is well known, higher resolution and smaller pixel pitch of the SLM on which the hologram is loaded will lead to a larger viewing zone and a bigger size of the 3D reconstructed image. Over visible range for human visual perception, a spatial light modulator with the resolution higher than 2000 lines/mm is required for realizing the 3D display with high quality, while the resolution of currently commercial SLMs is normally limited to no more than 150 lines/mm. Therefore, it is difficult to achieve a big enough 3D image in proper reconstructed distance.To obtain a reconstructed image with higher quality, scientists have proposed a lot of techniques to enlarge the viewing zone or 3D image. 3-9 Fukaya et al. 10,11 use several SLMs and a plano convex lens with a very large diameter and long focal length in geometrical combination by a beam splitter for achieving a larger image size and wider viewing zone simultaneously. In this system, the main function of the plano convex lens is the combination of the images reconstructed from different SLMs, not the enlargement of the 3D image. For solving the aberration caus...

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Section: Introductionmentioning

confidence: 99%

Magnification of three-dimensional optical image without distortion in dynamic holographic projection

et al. 2011

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“…1,2 The resulting digital holograms can be displayed on electronic accessible devices such as spatial light modulator (SLM) and liquid crystal on silicon (LCOS). 3 Recently, a number of works on fast generation of Fresnel holograms have been reported, [4][5][6][7][8][9][10][11][12][13] suggesting the possible emergence of the three-dimensional video holography systems.…”

Section: Introductionmentioning

confidence: 99%

Near computation-free compression of Fresnel holograms based on adaptive delta modulation

Tsang

2011

Opt. Eng

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Delta modulation (DM) is a classical technique that is generally applied to compress audio signals with a negligible amount of computation. Recently, it has been demonstrated that a similar approach can be applied to provide a moderate degree of compression, and at the same time maintain favorable coding fidelity, in compressing digital Fresnel holograms. The downside of this method is that it is necessary to determine an optimal step size for each of the source holograms through a trial and error process. In this paper we attempt to overcome this problem with adaptive delta modulation (ADM). Being different from the classical DM, the step size in ADM is automatically adjusted according to the intensity variation of the hologram. Experimental evaluation reveals that our proposed method is capable of attaining a compression ratio of 32 times without the need of determining the step size for each hologram. Hence, the proposed technique is useful for any holographic video system where holograms are needed to refresh at video rate. In addition, the proposed technique maintains favorable fidelity on the reconstructed images, and the complexity of both the encoding and decoding process is so small that they can be regarded as near computation-free operations. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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“…While this tiled arrangement of hologram elements can prove useful for some parallelized computational pipelines and display architectures, 17,18 it is not strictly necessary unless the slit plane is located on the hologram plane. When the slits are located elsewhere in space, abutting hogels are in fact a limiting construct.…”

Section: Diffraction-specific Computing: a Hybrid Formmentioning

confidence: 99%

Reconfigurable image projection holograms

Plesniak

Halle

Bove³

et al. 2006

Opt. Eng

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Abstract. We introduce reconfigurable image projection ͑RIP͒ holograms and a method for computing RIP holograms of three-dimensional ͑3-D͒ scenes. RIP holograms project one or more series of parallax views of a 3-D scene through one or more holographically reconstructed projection surfaces. Projection surfaces are defined at locations at which the hologram reconstructs a variable number of real or virtual images, called holographic primitives, which collectively compose the surface and constitute exit pupils for the view pixel information. RIP holograms are efficiently assembled by combining a sweep of 2-D parallax views of a scene with instances of one or more precomputed diffractive elements, which are permitted to overlap on the hologram, and which reconstruct the holographic primitives. The technique improves on the image quality of conventional stereograms while affording similar efficient computation: it incorporates realistic computer graphic rendering or high-quality optical capture of a scene, it eliminates some artifacts often present in conventional computed stereograms, and its basic multiply-and-accumulate operations are suitable for hardware implementation. The RIP approach offers flexible tuning of capture and projection together, according to the sampling requirements of the scene and the constraints of a given display architecture.

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Recent developments in computer-generated holography: toward a practical electroholography system for interactive 3D visualization

Cited by 57 publications

References 13 publications

Magnification of three-dimensional optical image without distortion in dynamic holographic projection

Magnification of three-dimensional optical image without distortion in dynamic holographic projection

Near computation-free compression of Fresnel holograms based on adaptive delta modulation

Reconfigurable image projection holograms

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