Holographic bandwidth compression using spatial subsampling

Lucente, Mark

doi:10.1117/1.600736

Cited by 39 publications

(13 citation statements)

References 23 publications

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“…A similar idea has been advanced in the diffraction-specific fringe computation by Lucente [71] with partitioning the hologram into holographic elements called hogels and each hogel having a linear superposition of weighted basic fringes corresponding to the points in a point cloud. Each segment in the CS emits a bundle of light rays that form a wavefront as a set of patches of mismatched plane waves due to lack of depth information.…”

Section: Phase-added Holographic Stereogram As a Fast Computation Appmentioning

confidence: 99%

3D Capture and 3D Contents Generation for Holographic Imaging

Stoykova¹,

Kang²,

Kim³

et al. 2017

Holographic Materials and Optical Systems

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The intrinsic properties of holograms make 3D holographic imaging the best candidate for a 3D display. The holographic display is an autostereoscopic display which provides highly realistic images with unique perspective for an arbitrary number of viewers, motion parallax both vertically and horizontally, and focusing at different depths. The 3D content generation for this display is carried out by means of digital holography. Digital holography implements the classic holographic principle as a two-step process of wavefront capture in the form of a 2D interference pattern and wavefront reconstruction by applying numerically or optically a reference wave. The chapter follows the two main tendencies in forming the 3D holographic content-direct feeding of optically recorded digital holograms to a holographic display and computer generation of interference fringes from directional, depth and colour information about the 3D objects. The focus is set on important issues that comprise encoding of 3D information for holographic imaging starting from conversion of optically captured holographic data to the display data format, going through different approaches for forming the content for computer generation of holograms from coherently or incoherently captured 3D data and finishing with methods for the accelerated computing of these holograms.

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Section: Phase-added Holographic Stereogram As a Fast Computation Appmentioning

confidence: 99%

3D Capture and 3D Contents Generation for Holographic Imaging

Stoykova¹,

Kang²,

Kim³

et al. 2017

Holographic Materials and Optical Systems

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“…In so doing, the main segments, containing original holographic data (samples) are uniformly distributed over a hologram and the segments with the same information (replicas) are placed in a close vicinity to the main segments. The idea was successfully applied in computational electroholography in order to reduce time of computation [1]. As the next step for application of sampling method in electroholography we suggest to employ it for the reduction of data, stored in a display's frame-buffer.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of a plane reconstructed object each point of the object is represented by the harmonic wavelet in a hologram plane. Position of the point in image plane is determined by its frequency: 6XFA6s) (1) Where X-shift of the image point from the zero position, F-focal length of the Fourier lens, s-spatial frequency shift relatively to zero point frequency, X-reconstruction wavelength. Diffraction limited size of the element of resolution in the image plane R is determined by the size of sample d which is to be chosen as one of the sampling parameter:…”

Section: Introductionmentioning

confidence: 99%

<title>Electroholographic display with minimum data redundancy</title>

Shestak

Evtikhiev

1999

SPIE Proceedings

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A method for synthesis of driving RF signal, corresponding to sampled hologram, which allows to minimize the capacity of the display memory, is suggested. With the application of new method required frame-buffer capacity for the current displays can be reduced by the factor 1.8-3. We have considered three variants of hologram sampling method for data reduction. It is found that minimum hologram data redundancy can be achieved with Fourier and Image types of holographic stereograms. For given 3-D image resolution a maximum image size, which can be displayed without redundancy is determined as 4. ..5 cm. Further scaling of the image requires application of the sampling method. With proper improvement of the hardware, application of hologram sampling method provides stable capacity of the display memory a little over 32 MB regardless the image size. Since the method also permits direct synthesis of driving RF signal, acousto-optical modulators with up to several GFIz bandwidth can be employed in electroholographic display.

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“…Use of a hologram as a security device for valuable documents and products has won a large-scale application, but did not hinder the development of other security devices. 9 Each "hogel" was treated as a very small hologram and was recorded using compact object and reference continuouswave (CW) 5,6 or pulsed laser beams. Nowadays, various types of digital holograms are used for protection and identification of industrial products and documents against counterfeiting, as well as for packing and decorating.…”

Section: Introductionmentioning

confidence: 99%

Holograms recording with pulsed laser on diazonaphthoquinone-novolac-based photoresists and their nanocomposites

et al. 2014

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Direct write digital holography technique (DWDH) using a single 440-nm pulsed laser exposure has been proposed to record master holograms on commercially available positive-tone photoresist systems based on a mixture of diazonaphthoquinone and novolac resin (DNQ-novolac) of different thicknesses. The DNQ-novolac nanocomposite doped with copper nanoparticles (CuNPs) films was also used. The method for numerical evaluation of hologram quality based on reflected beam diffraction intensity measurements was proposed and verified. It was found that all investigated photoresist nanocomposites were sensitive enough to record holographic structures at low single pulse laser exposures (from 3.3 to 18.0 mJ∕cm 2 ). Moreover, doping DNQ-novolac nanocomposite with CuNPs s increases its sensitivity to pulsed laser exposure by more than 30%. The potential of single pulsed laser exposures to record high quality master holograms on commercially available and metal nanoparticles doped photoresists with at least five times lower exposures values as compared to the continuous-wave laser exposures usually used to expose photoresist materials in holographic applications, opens the possibility to use pulsed lasers for quick master-originals origination for embossed holograms applying a DWDH technique or analog methods.

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Holographic bandwidth compression using spatial subsampling

Cited by 39 publications

References 23 publications

3D Capture and 3D Contents Generation for Holographic Imaging

3D Capture and 3D Contents Generation for Holographic Imaging

<title>Electroholographic display with minimum data redundancy</title>

Holograms recording with pulsed laser on diazonaphthoquinone-novolac-based photoresists and their nanocomposites

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