Large scale and high resolution computer generated synthetic color rainbow hologram (original) (raw)
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Optics Letters, 1978
A one-step rainbow holography process, which uses the technique of aerial imaging of a lens, is presented. Experimental results of both pseudoscopic and orthoscopic holographic imaging are included. A brief discussion of the results of this new technique is also given.
Makara Journal of Technology
A digital rainbow hologram (DRH) is a potential next-generation three-dimensional display media for the development of modern and smart electronics devices. It is one of the methods that can support the characteristic whereby a realistic display media occupies the space that the real object would have occupied. Since a rainbow hologram records a large amount of spatial or temporal frequency component from the object that represents the rainbow spectrum, a large amount of information needs to be decoded digitally. In this paper, to reconstruct a DRH, we propose a novel method based on the modulation of red, green, and blue spectral components of light by wavelet transform (WT) in the recording and reconstruction processes, which we digitally simulated in a computer using an algorithm. In the simulations, continuous WT (CWT) was based on Haar, Daubechies, Meyer, and Coiflet wavelets with a level set to be two. Based on the results of simulations using CWT, the optimum distance between object and hologram was 30 cm, and the maximum compression was 88.55%, which was achieved with Meyer wavelet. Moreover, optimal de-noising and optimal localization of spatial frequency component based on red, green, and blue spectral components were also achieved using the proposed method.
Color holography to produce highly realistic three-dimensional images
The 1964 publication by Emmett Leith and Juris Upatnieks [J. Opt. Soc. Am. 54, 1295 (1964)] introduced the possibility of using holograms to record three-dimensional (3D) objects. Since then, there has been an interest in creating display holograms, i.e., holograms primarily produced to show objects in 3D. More recently, full color holography has become a reality, which was predicted in the 1964 paper. To record a hologram in which both the 3D shape and the color of the object are accurately reproduced, at least three laser wavelengths are needed. By computer simulation of the holographic color rendering process, the required amount of laser wavelengths and their distribution within the visible electromagnetic spectrum have been investigated. The quality of a color hologram also depends on the properties of the recording material. The demand on a panchromatic material for color holography is described. Recording techniques for color holograms are presented as well as the future of color holography as the perfect 3D imaging technique.
360-degree color hologram generation for real 3D objects
Applied optics, 2018
Recently, holographic display and computer-generated holograms calculated from real existing objects have been more actively investigated to support holographic video applications. In this paper, we proposed a method of generating 360-degree color holograms of real 3D objects in an efficient manner. 360-degree 3D images are generated using the actual 3D image acquisition system consisting of a depth camera and a turntable and intermediate view generation. Then, 360-degree color holograms are calculated using a viewing-window-based computer-generated hologram. We confirmed that floating 3D objects are faithfully reconstructed around a 360-degree direction using our 360-degree tabletop color holographic display.
New ways to make computer-generated color holograms
Nouvelle Revue d'Optique, 1974
Nouveaux procedes de synthhse des hologrammes en couleurs par ordinateurs RESUME : On peut obtenir des images en couleurs a partir de trois hologrammes realises par ordinateur, chaque hologramme correspondant a une couleur fondamentale. Deux pro
A New Method of Colour Holography
A new method of producing multicolour holograms is proposed. The method is based on the technique of dispersion compensation, and exploits the wavelength selectivity of volume holograms. The colour saturation of the resultant image increases with increasing wavelength selectivity of the hologram.
Design and fabrication of stacked, computer generated holograms for multicolor image generation
Applied Optics, 2007
We present a diffractive optical element consisting of computer-generated holograms and dielectric multilayer mirrors in a stratified setup. Illuminated with a white laser beam, consisting of three single lasers with wavelengths of 635 nm, 543 nm, and 473 nm, this element enables the far field projection of arbitrary, multicolor images. Certain advantages of holographic image generation, e.g., the possibility of a large depth of focus and a very easy optical setup, are maintained with the new element.
High-resolution Fresnel hologram information simplification and color 3D display
High-resolution color Fresnel hologram is computation extensive. In this research, we propose a spatial sampling method to reduce the information redundancy of high-resolution Fresnel ho-lograms. The color Fresnel hologram by combining of three monochromatic sampled holograms is achieved without barrier effect. Theoretical analysis of human visual perception of the color Fresnel hologram is conducted. A color holographic 3D display method using RGB LEDs as illumination sources is implemented for color holographic 3D display using color Fresnel holo-grams with the size of 30 mm × 30 mm at the resolution of 94,208 × 94,208 pixels. The proposed method is verified through experimental study illustrating the effectiveness of the proposed method.
Creation of Multicolor Images by Reflective, Wavelength Selective, Computer Generated Holograms
Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM, 2007
We present two novel approaches to realize diffractive optical elements for multicolor image generation, which maintain some important and unique advantages of monochromatic image generation by Fourier-type, computer generated holograms.
Fabrication of digital rainbow holograms and 3-D imaging using SEM based e-beam lithography
Optics Express, 2014
Here we present an approach for creating full-color digital rainbow holograms based on mixing three basic colors. Much like in a color TV with three luminescent points per single screen pixel, each color pixel of initial image is presented by three (R, G, B) distinct diffractive gratings in a hologram structure. Change of either duty cycle or area of the gratings are used to provide proper R, G, B intensities. Special algorithms allow one to design rather complicated 3D images (that might even be replacing each other with hologram rotation). The software developed ("RainBow") provides stability of colorization of rotated image by means of equalizing of angular blur from gratings responsible for R, G, B basic colors. The approach based on R, G, B color synthesis allows one to fabricate gray-tone rainbow hologram containing white color what is hardly possible in traditional dot-matrix technology. Budgetary electron beam lithography based on SEM column was used to fabricate practical examples of digital rainbow hologram. The results of fabrication of large rainbow holograms from design to imprinting are presented. Advantages of the EBL in comparison to traditional optical (dot-matrix) technology is considered.