Optimized random phase only holograms

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August undefined, 2024

WebAug 9, 2024 · generate phase only holograms corresponding to a color scene using a technique known as optimized random phase (ORAP) [36] under a space division … WebFeb 15, 2024 · This produces an optimized random phase (ORAP), which is used for fast generation of phase only holograms of arbitrary amplitude targets. This ORAP needs to be …

Optimized random phase encryption

WebSep 7, 2024 · We present a fast and simple technique to generate phase only Fresnel holograms of 2D intensity objects. This technique uses a modified Gerchberg-Saxton (G-S) algorithm to optimize a random phase. This optimization takes into account the resolution, pixel size, reconstruction plane, and optical characteristics of the system that will … WebSep 7, 2024 · We present a fast and simple technique to generate phase only Fresnel holograms of 2D intensity objects. This technique uses a modified Gerchberg-Saxton (G … how to spell hoof

Review of computer-generated hologram algorithms for color

WebJan 27, 2024 · Phase holograms [ 18, 19, 20] allow for higher DE value than their amplitude counterparts. This type of hologram is commonly synthesized by iterative methods such as the Gerchberg–Saxton algorithm [ 21 ]. Phase holograms are reconstructed using phase liquid crystal spatial light modulators [ 22 ]. WebFeb 15, 2024 · This produces an optimized random phase (ORAP), which is used for fast generation of phase only holograms of arbitrary amplitude targets. This ORAP needs to … WebPhase-Only Holograms. Obtaining a desired wavefront in the focal plane requires introducing the appropriate wavefront in the input plane. Most lasers, however, provide … how to spell honeycomb

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WebFeb 7, 2024 · The Gerchberg–Saxton (GS) algorithm is a widely employed algorithm for the calculation of a phase-only hologram (POH). However, the POH that can strictly satisfy the amplitude constraints on the object and the holographic plane may not exist or be obtained, resulting in speckle noise and reduction of the reconstruction quality. WebJul 26, 2024 · In 1966, Lohmann and Brown devised detour phase method to encode the optical wavefronts into holograms by computer 19. In 1967, Lohmann and Paris applied the fast Fourier transform (FFT)... rdr2 annesburg treasure locationWebJan 15, 2024 · In phase-only holograms, only the object light is reconstructed, but in principle, a bleached-phase hologram generates conjugate light and direct light in addition … rdr2 appleseed timber co location

"WebA DNN of (Ishii et al., 2024) converts a phase-only hologram computed using the random phase-free method in an optimized phase-only hologram. Two layers for computing the forward and inverse scaled diffraction … " - Optimized random phase only holograms

Optimized random phase only holograms

Improvement of the image quality of random phase-free …

WebFeb 18, 2024 · The GS method and non-optimized random phase results are compared by applying an equal number of TM (24 binary holograms). The Random results are illustrated by dot line because they are not ... WebJun 10, 2024 · Ishii, Y. et al. Optimization of phase-only holograms calculated with scaled diffraction calculation through deep neural networks. Applied Physics B 128, 1-11 (2024). ... In this method, a small phase mask with random phase is first optimized by iterative optimization. Then, the optimized small mask is tiled to the same size as the original ...

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WebMay 1, 2024 · For the CGH optimized algorithm, an usual solution for generating holograms is the integral diffraction calculation of the target intensity and the random phase mask [8], [9], [10], [11], which is defined as the conventional method in this paper. WebIn order to optimize computer-generated holograms (CGHs) for three-dimensional objects, an extension of the well known Gerchberg-Saxton algorithm is used. Optical reconstructions using an electrically addressed twisted-nematic liquid crystal display are presented. For arbitrary CGHs, reconstructing 3D-objects, we will discuss the problems and ...

WebAug 9, 2024 · The ORAP technique uses a pre-generated random phase to obtain large amounts of holograms without need for iterative algo- rithms. As we will show, this method has the advantage of introducing an interframe correlation when generating a … Web1. Introduction. The computer-generated hologram (CGH), as a promising technology for three-dimensional display, has attracted broad attention in the past two decades [1 – 4].Since no display device can modulate the amplitude and phase of the incident light field simultaneously, the complex amplitude hologram (CAH) needs to be converted to an …

WebSep 7, 2024 · The ORAP method can also be adapted to the generation of phase-only Fresnel holograms; in this case, it is known as the optimized Fresnel random phase (OFRAP) … WebNov 15, 2015 · There are well-known methods for improving the random phase applied-holograms: the Gerchberg–Saxton (GS) algorithm [10], [11], the multi-random phase method [12], the one-step-phase-retrieval method (OSPR) …

WebNov 10, 2024 · The optimized maximal value of the random phases is analyzed. Utilizing the evaluation results, we propose a frequency-based optimized random phase that reduces the unfavorable effect of the insufficient dynamic range of computer-generated holograms and prevents excessive diffusions by traditional random phases.

WebAn iterative method with bandwidth constraint strategy is proposed to design phase holograms for high-quality speckle-free optical reconstruction. The bandwidth properties of the reconstructed field are analyzed theoretically based on the sampling theory, which helps in properly allocating the sampling resources for efficiently describing the speckles and … rdr2 animal location mapWebFeb 1, 2024 · This website requires cookies, and the limited processing of your personal data in order to function. By using the site you are agreeing to this as outlined in our privacy … how to spell hoorahWebWe propose for the first time, to the best of our knowledge, the use of optimized random phases (ORAPs) in a double random phase encryption scheme (DRPE). In DRPE schemes … how to spell hoopWebFeb 1, 2024 · For comparison, we generated three holograms of the same resolution and the same intensity distribution using the sequential G-S algorithm with 20 iterations and by using simple multiplexing of random phase holograms for each individual plane of … how to spell hookey how to spell hookyWebMar 16, 2024 · The calculation conditions are as follows: hologram size 1024 × 1024 pixels, 532 nm wavelength, pixel pitch of 8 μ m, and a propagation distance of 0.2 m between the hologram and object planes. We used the angular spectrum method for … rdr2 appleseed timber companyWebApr 17, 2024 · 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, a phase mask with a periodic phase pattern is added to the source image, and converted into a hologram. how to spell hook up