Multiwavefront digital holographic television

Kujawińska, Małgorzata; Kozacki, Tomasz; Falldorf, Claas; Meeser, Thomas; Hennelly, Bryan M.; Garbat, Piotr; Zaperty, Weronica; Niemelä, Mikko; Finke, Grzegorz; Kowiel, Marcin; Naughton, Thomas J.

doi:10.1364/oe.22.002324

Cited by 45 publications

(20 citation statements)

References 28 publications

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“…The bandwidth of the SLM is used to produce view for a single eye which has to be placed behind the viewing window. Second approach, which do not requires eye tracking uses a set of SLMs and it was reported by several authors [2,3,6,[10][11][12]27,28]. The example of such a design is presented in Fig.…”

Section: Holographic Display Systemsmentioning

confidence: 99%

“…To overcome this problem three basic approaches have been realized: reconstructing of a small part of a wavefront originating from an object with SeeReal technology [8], creating high resolution, large aperture (with high pixel count) holographic display [9] and using a multi-SLM system with additional spatio-temporal multiplexing capabilities [6][7]27]. The most advanced holographic display system adopted for full holographic video chain (fed with digital holograms) had been developed by the group from Warsaw University of Technology within the 7FP EU project Real3D (2008-2011) [28]. The problem of insufficient SBP is addressed by some groups making progress in the field of updatable holographic displays based on photorefractive polymers [29].…”

Section: Introductionmentioning

confidence: 99%

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New concept of technology chain for 3D/4D content generation and display

2014

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The main goal of this paper is to introduce the concept of next-generation of 3D and 4D imaging technology, which is capable of multi-source capture, multi-representation processing, multi-data-content mixing and provides a holographic content and display with ultrahigh resolution. The technology allows the generation and display of color holographic data content that is composed of real life and synthetic scenes. The diversity, complexity and extreme high resolution of this 3D/4D imaging system requires the development of tools that compose the holographic content captured from a multi-source system (dynamic objects of human sized dimensions, far distant backgrounds, and synthetic scene elements). In the area of capture technology the system includes a dynamic, high resolution, color holographic capture systems and multimodal 3D and 4D (3D+time) structured light systems. Progress in innovative data and content processing technology is going to be made as several methods and tools for processing 3D/4D holographic representations (amplitude-phase) and the composition of different data types (surface representation, 2D images) into a single extreme high resolution holographic video are introduced. In addition, the concept includes procedures for the generation of events that support interaction of both 4D surface and amplitude-phase data and introduce a 3D/4D data representation exchange format (surface to/from holographic).

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Section: Holographic Display Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New concept of technology chain for 3D/4D content generation and display

2014

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“…Holographic Displays (HDs) are able to generate real or virtual 3D images without requiring 3D glasses for the viewer [5,6]. Holographic displays have emerging applications in augmented reality and virtual reality [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of spatial coherence of LED sources on image resolution in holographic displays

et al. 2017

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Holographic Displays (HDs) provide 3D images with all natural depth cues via computer generated holograms (CGHs) implemented on spatial light modulators (SLMs). HDs are coherent light processing systems based on interference and diffraction, thus they generally use laser light. However, laser sources are relatively expensive, available only at some particular wavelengths and difficult to miniaturize. In addition, highly coherent nature of laser light makes some undesired visual effects quite evident, such as speckle noise, interference due to stray light or defects of optical components. On the other hand, LED sources are available in variety of wavelengths, has small die size, and no speckle artifact. However, their finite spatial size introduce some degree of spatial incoherence in an HD system and degrade image resolution, which is the subject of the study in this paper. Our theoretical analysis indicates that the amount of resolution loss depends on the distance between hologram and SLM image planes. For some special configurations, the source size has no effect at all. We also performed experiments with different configurations using lasers and LEDs with different emission areas that vary from 50 µm to 200 µm, and determined Contrast Transfer Function (CTF) curves which agree well with our theoretical model. The results show that it is possible to find configurations where LEDs combined with pinholes almost preserve natural resolution limit of human eye while keeping the loss in light efficiency within tolerable limits.

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“…It has already been well described and is commercially available since in this solution technological development (SLM parameters) is already sufficient. The second approach relies on creating high resolution, big aperture (with high pixel count) holo− graphic display which provides simultaneously (in reference to human vision system inertia) total information about dis− played image within a wide viewing zone for multiple obser− vers [8]. The good example of the second approach is the "active tiling" system developed by QuinetiQ [9], however, the hardware connected with this system (based on combina− tion of electrically and optically addressed SLM and multi− ple optics) is highly complicated.…”

Section: Introductionmentioning

confidence: 99%

“…However, the more virtual SLMs appear, the higher refresh rate an SLM should work with. To lessen this condition spatiotemporal multiplexing methods which utilize several physical SLMs multiplied temporally are used [8].…”

Section: Introductionmentioning

confidence: 99%