检索结果-南通市图书馆

Chinese Optics Letters 2021年第11期19卷 8-15页

作者： Ren Noguchi Kohei Suzuki Yoshiki Moriguchi minoru oikawa Yuichiro Mori Takashi Kakue Tomoyoshi Shimobaba Tomoyoshi Ito Naoki Takada Graduate School of Integrated Arts and Sciences Kochi UniversityKochi 780-8520Japan Research and Education Faculty Kochi UniversityKochi 780-8520Japan Graduate School of Engineering Chiba UniversityChiba 263-8522Japan

In amplitude-modulation-type electroholography, the binary-weighted computer-generated hologram(BW-CGH) facilitates the gradation-expressible reconstruction of three-dimensional(3 D) objects. To realize real-time gradation-expressible electroholography, we propose an efficient and high-speed method for calculating bit planes consisting of BW-CGHs. The proposed method is implemented on a multiple graphics processing unit(GPU) cluster system comprising 13 GPUs. The proposed BW-CGH method realizes eight-gradation-expressible electroholography at approximately the same calculation speed as that of conventional electroholography based on binary computer-generated holograms. Consequently, we were able to successfully reconstruct a real-time electroholographic 3 D video comprising approximately 180,000 points expressed in eight gradations at 30 frames per second.

关键词： gradation-expressible electroholography binary-weighted computer-generated hologram digital micromirror device computer-generated hologram

Real-time electroholography using a single spatial light modulator and a cluster of graphics-processing units connected by a gigabit Ethernet network

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第7期18卷 23-27页

作者： Hiromi Sannomiya Naoki Takada Tomoya Sakaguchi Hirotaka Nakayama minoru oikawa Yuichiro Mori Takashi Kakue Tomoyoshi Shimobaba Tomoyoshi Ito Graduate School of Integrated Arts and Sciences Kochi UniversityKochiKochi 780-8520Japan Research and Education Faculty Kochi UniversityKochiKochi 780-8520Japan National Astronomical Observatory of Japan MitakaTokyo 181-8588Japan Graduate School of Engineering Chiba UniversityChibaChiba 263-8522Japan

Systems containing multiple graphics-processing-unit(GPU)clusters are difficult to use for real-time electroholography when using only a single spatial light modulator because the transfer of the computer-generated hologram data between the GPUs is *** overcome this bottleneck,we propose a rapid GPU packing scheme that significantly reduces the volume of the required data *** proposed method uses a multi-GPU cluster system connected with a cost-effective gigabit Ethernet *** tests,we achieved real-time electroholography of a three-dimensional(3D)video presenting a point-cloud 3D object made up of approximately 200,000 points.

关键词： real-time electroholography multiple-graphics processing unit cluster graphics processing unit gigabit Ethernet

同方期刊数据库

Color representation method using RGB color binary-weighted computer-generated holograms

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2018年第8期16卷 25-29页

作者： Masato Fujiwara Naoki Takada Hiromitsu Araki Shohei Ikawaa Yuki Maeda Hiroaki Niwase minoru oikawa Takashi Kakue Tomoyoshi Shimobaba Tomoyoshi Ito Graduate School of h~teg＇rated Arts and Sciences Kochi University Kochi 780-8520 Japan 2Science Department Natural Sciences Cluster Research and Education Faculty Kochi University Kochi 780-8520 Japa Faculty of Science Kochi University Kochi 780-8520 .lapan IGraduate School of Engineering Chiba University Chiba 263-8522 Japan

We propose a method for color electroholography using a simple red-green-blue （RGB） gradation representa- tion method without controlling the respective brightness of tile reference RGB-colored lights. The proposed method uses RGB multiple bit planes comprising RGB binary-weighted computer-generated holograms with various light transmittanees. The object points of a given three-dimensional （3D） object are assigned to RGB nmltiple bit planes according to their RGB gradation levels. The RGB multiple bit planes are sequentially displayed in a tim-division-multiplexe- manner. Consequently, the proposed method yields a color gradation representation of a reconstructed 3D object.

关键词： RGB Color representation method using RGB color binary-weighted computer-generated holograms CGH

High-speed playback of spatiotemporal division multiplexing holographic 3D video stored in a solid-state drive using a digital micromirror device

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第9期19卷 121-126页

作者： Kohei Suzuki Minori Tao Yuki Maeda Hirotaka Nakayama Ren Noguchi minoru oikawa Yuichiro Mori Takashi Kakue Tomoyoshi Shimobaba Tomoyoshi Ito Naoki Takada Graduate School of Integrated Arts and Sciences Kochi UniversityKochi 780-8520Japan Faculty of Science Kochi UniversityKochi 780-8520Japan National Astronomical Observatory of Japan Tokyo 181-8588Japan Research and Education Faculty Kochi UniversityKochi 780-8520Japan Graduate School of Engineering Chiba UniversityChiba 263-8522Japan

We propose a high-speed playback method for the spatiotemporal division multiplexing electroholographic three-dimensional(3D)video stored in a solid-state drive(SSD)using a digital micromirror *** spatiotemporal division multiplexing electroholography prevents deterioration in the reconstructed 3D video from a 3D object comprising many object *** the proposed method,the stored data is remarkably reduced using the packing technique,and the computer-generated holograms are played back at high ***,we successfully reconstructed a clear 3D video of a 3D object comprising approximately 1,100,000 points at 60 frames per second by reducing the reading time of the stored data from an SSD.

关键词： spatiotemporal division multiplexing electroholography digital micromirror device computer-generated hologram high-speed playback

Real-time color holographic video reconstruction using multiple-graphics processing unit cluster acceleration and three spatial light modulators

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第1期18卷 18-22页

作者： Shohei Ikawa Naoki Takada Hiromitsu Araki Hiroaki Niwase Hiromi Sannomiya Hirotaka Nakayama minoru oikawa Yuichiro Mori Takashi Kakue Tomoyoshi Shimobaba Tomoyoshi Ito Faculty of Science Kochi UniversityKochi 780-8520Japan Research and Education Faculty Kochi UniversityKochi 780-8520Japan Graduate School of Integrated Arts and Sciences Kochi UniversityKochi 780-8520Japan Center for Computational Astrophysics National Astronomical Observatory of JapanMitaka-shi 181-8588Japan Graduate School of Engineering Chiba UniversityChiba 263-8522Japan

We demonstrate real-time three-dimensional(3D)color video using a color electroholographic system with a cluster of multiple-graphics processing units(multi-GPU)and three spatial light modulators(SLMs)corresponding respectively to red,green,and blue(RGB)-colored reconstructing *** multi-GPU cluster has a computer-generated hologram(CGH)display node containing a GPU,for displaying calculated CGHs on SLMs,and four CGH calculation nodes using 12 *** GPUs in the CGH calculation node generate CGHs corresponding to RGB reconstructing lights in a 3D color video using pipeline ***-time color electroholography was realized for a 3D color object comprising approximately 21,000 points per color.

关键词： color electroholography real-time electroholography multiple-graphics processing unit cluster graphics processing unit

Fast time-division color electroholography using a multiple-graphics processing unit cluster system with a single spatial light modulator

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2017年第12期15卷 34-37页

作者： Hiromitsu Araki Naoki Takada Shohei Ikawa Hiroaki Niwase Yuki Maeda Masato Fujiwara Hirotaka Nakayama minoru oikawa Takashi Kakue Tom oyoshi Shim obaba and Tom oyoshi Ito Graduate School of Integrated Arts and Sciences Kochi Universit y Kochi 780-8520 Japan Science Department Natural Sciences Cluster Research and Education Faculty Kochi University Kochi 780-8520 Japan Faculty of Science Kochi University Kochi 780-8520 Japan Center for Computational Astrophysics National Astronomical Observatory of Japan Mitaka-shi 181-8588 Japan Graduate School of Engineering Chiba University Chiba 263-8522 Japan

We demonstrate fast time-division color etectroholography using a multiple-graphics-processing-unit （GPU） cluster system with a spatial light modulator and a controller to switch the color of the reconstructing light. The controller comprises a universal serial bus module to drive the liquid crystal optical shutters. By using the controller, the computer-generated hologram （CGH） display node of the multiple-GPU cluster system synchronizes the display of the CGH with the color switching of the reconstructing light. Fast time-division color electroholography at 20 fps is realized for a three-dimensional object comprising 21,000 points per color when 13 GPUs are used in a multiple-GPU cluster system.

关键词： GPU RGB Fast time-division color electroholography using a multiple-graphics processing unit cluster system with a single spatial light modulator CGH