We propose a fast method for generating digital Fresnel holograms based on an interpolated wavefront-recording plane (IWRP) approach.Our can be divided into two stages.First, small, virtual IWRP is derived in computational-free manner.Second, the expanded hologram with pair of Fourier transform processes, which are realized graphic processing unit (GPU).We demonstrate state-of-the-art experimental results, capable 2048x2048 around 6 4 10 object points at rate over 40 frames per second.

A fast and non-iterative method for generating a phase-only hologram, hereafter referred to as the patterned-phase-only hologram (PPOH), is reported in this paper. Briefly, phase mask with periodic pattern added source image, converted into hologram. Subsequently, only component retained Experimental evaluation reveals that visual quality of reconstructed images PPOH generated our proposed favorable, superior obtained existing methods.

Ageism remains an obstacle to building age-friendly environment. Although the rise of ageist microaggressions (i.e., subtle discrimination) threatens older adults from maintaining well-being, mechanism understudied. The present study examined using a transactional model. Specifically, we whether ageing and death anxieties contribute self-ageism influence benevolent hostile ageism. These beliefs might lead microaggressions, respectively. Cross-sectional data 214 Hong Kong middle-aged (

In the past two decades, generation and encryption of holographic images have been identified as important areas investigation in digital holography. The integration these technologies has enabled to be encrypted with more dimensions freedom on top simply employing keys. Despite moderate success attained date, rapid advancement computing technology recent years, heavy computation load involved processes remains a major bottleneck evolution holography technology. To alleviate this problem, we...

Past research has demonstrated that digital Fresnel holograms can be binarized in a non-iterative manner by downsampling the source image with grid lattice prior to hologram generation process.The reconstructed of is this approach superior quality compared obtained direct thresholding, half-toning, and error diffusion.Despite success, mechanism results prominent texture regularly spaced voids shaded regions.To alleviate problem, an enhanced method for binary presented.Our based on...

The wavefront recording plane (WRP), subsequently generalized to be known as the virtual diffraction (VDP), is a recent concept that has been successfully deployed in fast generation and processing of digital holograms.In brief, WRP its extension, VDP, hypothetical located between hologram object scene, which at close proximity latter.As such, fringe patterns on are carrying holistic information hologram, well local optical properties scene.This important property enables processed with...

The principle of optical scanning holography (OSH) is proposed to acquire horizontal-parallax-only (HPO) holographic information electronically. We first briefly summarize the results OSH and then discuss how HPO-electronic can be acquired using OSH. Finally we provide simulations illustrate clarify idea. Although many ideas HPO-holography have been studied, best our knowledge, this electronic technique HPO-holographic information.

In off-axis digital holography, the Fourier transform-based algorithm is commonly used for signal processing. Here, we derive theoretical phase sensitivity of this algorithm, which can be calculated from a single 2D hologram. This represents best achievable system using algorithm. Our derivation treats in its most general form, considering non-uniform illumination and effect sideband filtering. As result, varies spatially, determined by local signal-to-noise ratio. Sensitivity expressions...

Relighting is an important technique in photography which enables the optical properties of a picture to be modified without retaking it again. However, different from image, digital hologram cannot relit by simply varying value individual pixel, as each them representing holistic information entire object scene. In this paper, we propose fast method for relighting hologram. First, latter projected virtual wavefront recording plane (WRP) that located close Next, WRP relit, and subsequently...

This paper describes a method for converting complex Fresnel hologram into phase-only that can be embedded with large amount of data.Briefly, each row pixels in the is scanned sequentially left-to-right direction.The magnitude visited pixel set to constant, and its phase data.Subsequently, error diffused neighborhood pixels.The realized such means, which referred as data-embedded-error-diffusion (DEED) hologram, capable preserving high fidelity on content data.

We report a low complexity, non-iterative method for enhancing the sharpness, brightness, and contrast of pictorial content that is recorded in digital hologram, without need re-generating latter from original object scene. In our proposed method, hologram first back-projected to 2-D virtual diffraction plane (VDP) which located at close proximity points. Next field distribution on VDP, shares similar optical properties as scene, enhanced. Subsequently, processed VDP expanded into full...

Past research has demonstrated that if the intensity image of an object is uniformly down-sampled and converted into a Fresnel hologram, phase component alone will be sufficient to reconstruct source image. However, due down-sampling, edge line patterns are degraded heavily. In this Letter, we propose enhancement on parent method by incorporating adaptive down-sampling lattice. A hologram generated with our proposed method, which referred as edge-enhanced sampled phase-only preserves...

We report, for the first time, concept and generation of a novel Fresnel hologram called digital binary mask programmable (BMPH). A BMPH is comprised static, high resolution grating that overlaid with lower mask. The reconstructed image can be programmed to approximate target (including both intensity depth information) by configuring pattern simple genetic algorithm (SGA). As low realized less stringent display technology, our method enables development economical holographic video display.

Past research has demonstrated that a phase-only hologram can be obtained by down-sampling the intensity image of object scene prior to generation hologram. In this Letter, we extend method binary holograms. A derived with our proposed is referred as binary-sampled (BSPOH). Being different from parent scheme, have adopted an off-axis configuration in BSPOH avoid quantization noise, zeroth-order light, and conjugate lights. An experimental evaluation reveals reconstructed good quality, only...

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text P. W. M. Tsang, J. Liu, T. C. Poon, and K. Cheung, "Fast Generation of Hologram Sub-Lines Based Field Programmable Gate Array," in Advances Imaging, OSA Technical Digest (CD) (Optica Publishing Group, 2009), paper DWC2. Export BibTex Endnote (RIS) HTML Plain alert Save article

Research demonstrates that a Fresnel hologram can be generated and simultaneously encrypted numerically based on secret symmetric key formed by the maximal length sequence (M-sequence). The method directly extended to encrypt video holographic clip in frame-by-frame manner. However, given limited combination of signals family M-sequence, hacking through trial error time consuming but not difficult. In this letter, we propose is difficult crack with brute force for encrypting sequence. An...

Advancements in optical, computing, and electronic technologies have enabled holograms of physical three-dimensional (3D) objects to be captured. The hologram can displayed with a spatial light modulator reconstruct visible image. Although holography is an ideal solution for recording 3D images, comprises high-frequency fringe patterns that are almost impossible recognize traditional computer vision methods. Recently, it has been shown classified deep learning based on convolution neural...

In this paper, a fast method for displaying digital, real and off-axis Fresnel hologram on lower resolution device is reported. Preserving the original of upon display one important attributes proposed method. Our can be divided into 3 stages. First, digital representing given three dimensional (3D) object down-sampled based fix, jitter down-sampling lattice. Second, interpolated, through pixel duplication, low that displayed with low-resolution spatial light modulator (SLM). Third, SLM...

We propose a technique of obtaining the Hilbert transform for incoherent objects. design pupil functions in optical scanning holography so as to obtain hologram scanned object. From hologram, we can extract Computer simulations verify proposed technique.

With an acousto-optic frequency shift of 80 MHz, a synthetic wavelength in the order meters can be achieved. Accurate surface maps are obtained for multi-depth object using multi-wavelength digital holography without phase-unwrapping.

The criterion for depth of focus is expressed solely in terms the f /number lens and wavelength light. Perceived image quality can generally be expected to depend not only on these parameters but also spectral content object. Assuming that optical designer knows advance highest frequency resolved image, with a minimum allowed visibility, more precise formulated. performance an incoherent imaging system specified its transfer function (OTF). Pieper et al. 1 studied resolution dependence...

An acoustooptic system can be characterized in terms of the spatial impulse response or a transfer function which relates angular plane wave spectrum output light field to that input field. A general methodology for calculating and is briefly explained. This then specifically applied case cells with without Hamming apodization sound Results obtained are compared analytical expressions conventional Bragg cell typical ranges Klein-Cook Q parameter 1 intensities. Implications results relating...