Full Color Computer-Generated Rainbow Hologram with Enlarged Viewing Angle

Yoshikawa, Hiroshi; Kagotani, Akihito

doi:10.1007/s10043-002-0251-5

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…However, none of them has proposed an effective approach that can optimize the color quality of holographic image. In addition, many studies have been published in the last few years about the CCGH display technique, which just mentioned that the color object from computer was decomposed into RGB components and three primary object waves are encoded into hologram during CCGH [9]- [11]. However, they have not established the relationship between amplitude of object wave and RGB components.…”

Section: Introductionmentioning

confidence: 98%

Practical Color Matching Approach for Color Computer-Generated Holography

Shi

Wang

et al. 2013

J. Display Technol.

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A color matching method for improving the color reproduction quality of color computer-generated holography (CCGH) is proposed. It is found that the amplitude of object wave in CCGH is related with object's color quantity in computer display colorimetric system, three primary wavelengths of CCGH and spectral distribution of illuminant source. Thus, this paper presents the conversion relationship between color quantity in computer display colorimetric system and amplitude of object wave in CCGH, which can improve the color quality of holographic image. In order to demonstrate the effectiveness of the proposed method, two experiments are conducted. The CCGH targets are respectively two-dimensional (2D) color object, three-dimensional (3D) gray and color mixed object. The experimental results demonstrate that the proposed color matching method of CCGH is effective. It has practical applications in both static and real-time dynamic holographic display, especially in high quality CCGH display.

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Section: Introductionmentioning

confidence: 98%

Practical Color Matching Approach for Color Computer-Generated Holography

Shi

Wang

et al. 2013

J. Display Technol.

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“…Computer-generated color rainbow holography (CGCRH) is a practical holographic imaging technique with a flexible wavefront reconstruction ability, which can easily fabricate holograms of real objects and virtual objects [1][2][3][4]. For practical color computer-generated holography (CCGH), one of the goals is to obtain a holographic image in true color as close as possible to a color object on a computer monitor (CRT or LCD) [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Color evaluation of computer-generated color rainbow holography

Shi¹,

Wang²,

Wu³

2012

J. Opt.

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A color evaluation approach for computer-generated color rainbow holography (CGCRH) is presented. Firstly, the relationship between color quantities of a computer display and a color computer-generated holography (CCGH) colorimetric system is discussed based on color matching theory. An isochromatic transfer relationship of color quantity and amplitude of object light field is proposed. Secondly, the color reproduction mechanism and factors leading to the color difference between the color object and the holographic image that is reconstructed by CGCRH are analyzed in detail. A quantitative color calculation method for the holographic image reconstructed by CGCRH is given. Finally, general color samples are selected as numerical calculation test targets and the color differences between holographic images and test targets are calculated based on our proposed method.

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“…In the first, image holograms are generated in real time with the constraints that the scene objects must be positioned in close proximity to the hologram [12]. The second method generates horizontal parallax only (HPO) rainbow holograms [13][14][15] that overcome both of the aforementioned problems. In this approach a 3-D scene is first partitioned into a vertical stack of regularly spaced scan planes.…”

Section: Introductionmentioning

confidence: 99%

Fast generation of Fresnel holograms based on multirate filtering

et al. 2009

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One of the major problems in computer-generated holography is the high computation cost involved for the calculation of fringe patterns. Recently, the problem has been addressed by imposing a horizontal parallax only constraint whereby the process can be simplified to the computation of one-dimensional sublines, each representing a scan plane of the object scene. Subsequently the sublines can be expanded to a two-dimensional hologram through multiplication with a reference signal. Furthermore, economical hardware is available with which sublines can be generated in a computationally free manner with high throughput of approximately 100 M pixels/second. Apart from decreasing the computation loading, the sublines can be treated as intermediate data that can be compressed by simply downsampling the number of sublines. Despite these favorable features, the method is suitable only for the generation of white light (rainbow) holograms, and the resolution of the reconstructed image is inferior to the classical Fresnel hologram. We propose to generate holograms from one-dimensional sublines so that the abovementioned problems can be alleviated. However, such an approach also leads to a substantial increase in computation loading. To overcome this problem we encapsulated the conversion of sublines to holograms as a multirate filtering process and implemented the latter by use of a fast Fourier transform. Evaluation reveals that, for holograms of moderate size, our method is capable of operating 40,000 times faster than the calculation of Fresnel holograms based on the precomputed table lookup method. Although there is no relative vertical parallax between object points at different distance planes, a global vertical parallax is preserved for the object scene as a whole and the reconstructed image can be observed easily.

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Full Color Computer-Generated Rainbow Hologram with Enlarged Viewing Angle

Cited by 13 publications

References 9 publications

Practical Color Matching Approach for Color Computer-Generated Holography

Practical Color Matching Approach for Color Computer-Generated Holography

Color evaluation of computer-generated color rainbow holography

Fast generation of Fresnel holograms based on multirate filtering

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