Author
Atsushi Shiraki
Bio: Atsushi Shiraki is an academic researcher from Chiba University. The author has contributed to research in topics: Holography & Volumetric display. The author has an hindex of 16, co-authored 48 publications receiving 1164 citations.
Papers
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TL;DR: This system can realize real-time reconstruction of a 64-point 3-D object at video rate using a liquid-crystal display of resolution 800x600 and the calculation speed of a GPU was found to be about 47 times faster than that of a personal computer with a Pentium 4 processor.
Abstract: We have applied the graphics processing unit (GPU) to computer generated holograms (CGH) to overcome the high computational cost of CGH and have compared the speed of a GPU implementation to a standard CPU implementation. The calculation speed of a GPU (GeForce 6600, nVIDIA) was found to be about 47 times faster than that of a personal computer with a Pentium 4 processor. Our system can realize real-time reconstruction of a 64-point 3-D object at video rate using a liquid-crystal display of resolution 800×600.
173 citations
TL;DR: A parallelized high performance computing board for computer-generated hologram, named HORN-5 board, where four large-scale field programmable gate array chips were mounted, realized a real-time reconstruction of electroholography.
Abstract: In electroholography, a real-time reconstruction is one of the grand challenges. To realize it, we developed a parallelized high-performance computing board for computer-generated hologram, named HORN-5 board, where four large-scale field programmable gate array chips were mounted. The number of circuits for hologram calculation implemented to the board was 1,408. The board calculated a hologram at higher speed by 360 times than a personal computer with Pentium4 processor. A personal computer connected with four HORN-5 boards calculated a hologram of 1,408×1,050 made from a three-dimensional object consisting of 10,000 points at 0.0023 s. In other words, beyond at video rate (30 frames/s), it realized a real-time reconstruction.
132 citations
TL;DR: The HORN-6 special-purpose computer for holography is developed, which succeeds in creating a computer-generated hologram of a three-dimensional image composed of 1,000,000 points at a rate of 1 frame per second.
Abstract: We developed the HORN-6 special-purpose computer for holography. We designed and constructed the HORN-6 board to handle an object image composed of one million points and constructed a cluster system composed of 16 HORN-6 boards. Using this HORN-6 cluster system, we succeeded in creating a computer-generated hologram of a three-dimensional image composed of 1,000,000 points at a rate of 1 frame per second, and a computer-generated hologram of an image composed of 100,000 points at a rate of 10 frames per second, which is near video rate, when the size of a computer-generated hologram is 1,920 x 1,080. The calculation speed is approximately 4,600 times faster than that of a personal computer with an Intel 3.4-GHz Pentium 4 CPU.
125 citations
TL;DR: A deep neural network is used to automatically learn the features of noise-contaminated CGI images and is able to predict low-noise images from new noise- Contamination CGI images.
112 citations
TL;DR: A new C++ class library for diffraction and CGH calculations, referred to as a CWO++ library, running on a CPU and GPU, which provides diffraction calculations useful for Computer Generated Holograms, digital holography, diffractive optical elements, microscopy, image encryption and decryption and three-dimensional analysis for optical devices.
108 citations
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TL;DR: Unique features of lens-free computational imaging tools are discussed and some of their emerging results for wide-field on-chip microscopy, such as the achievement of a numerical aperture of ∼0.8–0.9 across a field of view (FOV) of more than 20 mm2, which corresponds to an image with more than 1.5 gigapixels.
Abstract: In this perspective, the authors present the basic features of lens-free computational imaging tools and report performance comparisons with conventional microscopy methods. They also discuss the challenges that these computational on-chip microscopes face for their wide-scale biomedical application.
486 citations
279 citations
TL;DR: It is demonstrated that the full-parallax CGH, calculated by the proposed method and fabricated by a laser lithography system, reconstructs a fine 3D image accompanied by a strong sensation of depth.
Abstract: A large-scale full-parallax computer-generated hologram (CGH) with four billion (2(16) x 2(16)) pixels is created to reconstruct a fine true 3D image of a scene, with occlusions. The polygon-based method numerically generates the object field of a surface object, whose shape is provided by a set of vertex data of polygonal facets, while the silhouette method makes it possible to reconstruct the occluded scene. A novel technique using the segmented frame buffer is presented for handling and propagating large wave fields even in the case where the whole wave field cannot be stored in memory. We demonstrate that the full-parallax CGH, calculated by the proposed method and fabricated by a laser lithography system, reconstructs a fine 3D image accompanied by a strong sensation of depth.
254 citations
TL;DR: In electro-holographic displays, holographic polymer-dispersed, and acousto-optic devices are used as holographic displays as mentioned in this paper, which are based on physical duplication of light distribution.
Abstract: True-3D imaging and display systems are based on physical duplication of light distribution. Holography is a true-3D technique. There are significant developments in electro-holographic displays in recent years. Liquid crystal, liquid crystal on silicon, optically addressed, mirror-based, holographic polymer-dispersed, and acousto-optic devices are used as holographic displays. There are complete electro-holographic display systems and some of them are already commercialized.
252 citations
Patent•
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TL;DR: In this paper, the authors proposed an image display device that has an especially satisfactory display quality for animated images, and sufficiently suppresses the irregularities of display quality among pixels, including a light-emitting drive means that drives a light emitting means, based on an analog display signal inputted to the pixels.
Abstract: The invention provides an image display device that has an especially satisfactory display quality for animated images, and sufficiently suppresses the irregularities of display quality among pixels. The image display device includes a light emitting drive means that drives a light emitting means, based on an analog display signal inputted to the pixels, and a light emitting control switch for controlling a light-on or light-off of the light emitting means on one end of the light emitting drive means in each pixel.
222 citations