巻号一覧
44 巻, 7 号
「ホログラフィによる立体テレビ技術の現状と展望」特集号
選択された号の論文の12件中1～12を表示しています
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「ホログラフィによる立体テレビ技術の現状と展望」特集号
特 集
レーザー解説
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的場 修2016 年 44 巻 7 号 p. 412-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスA 3D display is expected to the development of new life-style or business as well as 3D television by taking advantage of hyper realistic feeling. This special issue provides state-of-the-art 3D television techniques based on holography. The content includes the development of electro-holography system and elemental devices of spatial light modulators.抄録全体を表示PDF形式でダウンロード (183K) -
高木 康博2016 年 44 巻 7 号 p. 413-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスHolography is an ideal three-dimensional display technique. However, its electronic implementation requires light modulation by tremendous number of pixels whose pitch should be comparable to the wavelength of light. In this paper, several techniques proposed to overcome the above difficulty are shown; the technique using multiple spatial light modulators, the time-multiplexing technique, the technique using acousto-optic modulators, the resolution redistribution technique, and the horizontally scanning technique. Especially, the horizontally scanning technique is explained in detail; it is realized using the screen scanning system and the viewing-zone scanning system. The 360-degree holographic display is also realized based on the latter system.抄録全体を表示PDF形式でダウンロード (956K) -
的場 修, 升田 和伸2016 年 44 巻 7 号 p. 418-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスA three-dimensional display using binary phase modulation is reviewed. To improvement of the reconstructed image quality, two methods such as the optimization of the binary phase pattern and the intensity accumulation are proposed. In the optimization of binary phase pattern, the modified Fresnel ping-pong algorithm is presented. The intensity accumulation reduces the speckle noise. Numerical and experimental results are presented to show the effectiveness of the proposed methods.抄録全体を表示PDF形式でダウンロード (721K) -
下馬場 朋禄, 角江 崇, 伊藤 智義2016 年 44 巻 7 号 p. 423-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスThis paper reviews fast calculation algorithms and hardware implementations for electro-holography. We review fast calculation algorithms that are mainly point cloud, polygon, multi-view image and RGB-D approaches. Subsequently, hardware implementations using field programmable gate arrays (FPGAs) and graphics processing units (GPUs) are overviewed. Fast algorithms and hardware implementations are highly necessary and will ensure the further development of electro-holography.抄録全体を表示PDF形式でダウンロード (564K) -
森 裕, 野村 孝徳2016 年 44 巻 7 号 p. 429-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスA speckle reduction approach in holographic display is introduced. Speckle occurs when a coherence light is diffused by a rough surface object and leads to image quality degradation in holographic reconstruction. We demonstrated speckle reduction using a low-coherence hologram synthesis to improve the digital holographic reconstruction and show the numerical simulation results of speckle reduction by the proposed approach.抄録全体を表示PDF形式でダウンロード (841K) -
菊池 宏, 町田 賢司2016 年 44 巻 7 号 p. 434-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスHolography provides satisfactory three-dimensional (3D) imaging technology because it can accurately reconstruct the wavefronts of light emanating from objects. Displaying 3D images with a wide viewing zone requires a spatial light modulator (SLM) having a fine pixel-pitch and an extremely large number of pixels. We have developed SLMs driven by spin-transfer switching for electronic holography. We called this device a spin-SLM. It is advantageous in terms of its submicron pixel size, high-speed light modulation, and non-volatility. We fabricated a one-dimensional spin-SLM with a 1-μm pixel-pitch based on giant magneto-resistance (GMR) and demonstrated its successful operation. We also succeeded in fabricating a two-dimensional spin-SLM with a 2-μm pixel-pitch based on tunnel magneto-resistance (TMR). In order to investigate feasibility of spin-SLM for a 3D display, a GMR-based hologram with a 1-μm pixel-pitch was fabricated and the characteristics of 3D imaging were evaluated.抄録全体を表示PDF形式でダウンロード (511K) -
橋本 信幸2016 年 44 巻 7 号 p. 439-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスLiquid crystal spatial modulators are one of the essential devices for information optics such as 3D displays, information processing and holographic data storage. In this review, several techniques to achieve high-speed drive of liquid crystal devices and their characteristics are described. Then we introduce a new ferroelectric liquid crystal on silicon device (F-LCOS). This binary device has 2K×2K pixels with a frame rate of 5,000/sec.抄録全体を表示PDF形式でダウンロード (934K)
レーザーオリジナル
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鳥谷 隆輔, 夏 鵬, 仁田 功一, 的場 修2016 年 44 巻 7 号 p. 444-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスWe propose a three-dimensional display using a phase-mode 1D spatial light modulator that improves the image quality by optimizing the phase distribution by using the iterative Fresnel method and a dummy area. The numerical results show that the image quality and the root mean square error are improved. To improve the reconstructed image quality as an alternative method, speckle averaging is employed. Two methods are discussed based on the numerical results.抄録全体を表示PDF形式でダウンロード (572K) -
長浜 佑樹, 下馬場 朋禄, 川島 徹也, 角江 崇, 伊藤 智義2016 年 44 巻 7 号 p. 449-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスThe iterative phase retrieval algorithm, called the Gerchberg-Saxton (GS) algorithm, is widely used to remove the speckle noise of holograms. Since the GS algorithm requires multiple diffraction calculations, it requires a large computation time. Another scheme, called the random phase-free method, uses virtual spherical waves instead of a random phase to diffuse reconstructed light. However, since ringing artifacts are conspicuous in this approach, an iterative phase retrieval algorithm must be used to remove them. In this paper, we proposed a phase porting method as a high-speed technique that utilizes the characteristics of ringing artifacts. We also compared the proposed method with existing methods in terms of calculation time and the image quality of the reconstructed images.抄録全体を表示PDF形式でダウンロード (969K) -
佐野 麻理恵, 糸井 淳一, 下馬場 朋禄, 阿比留 慎, 遠藤 優, 白木 厚司, 角江 崇, 伊藤 智義2016 年 44 巻 7 号 p. 454-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスA simple, compact, and low-cost digital holographic microscopy (DHM) system was developed by adopting a Gabor holographic setup. Light emitting diode (LED) illuminations and a complementary metal-oxide-semiconductor sensor on a commercial web camera were used to reduce costs. The developed system is light-weight and portable, having dimensions of 140(D)×100(W)×65(H) mm3 and a weight of 500 g. Results suggest that the system effectively works, with an estimated maximum spatial resolution 4.39-μm using a red LED (wavelength = 625 nm; quantity of light = 80 lm).抄録全体を表示PDF形式でダウンロード (998K) -
根尾 敦, 角江 崇, 遠藤 優, 下馬場 朋禄, 伊藤 智義2016 年 44 巻 7 号 p. 458-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスWe calculate computer-generated holograms (CGHs), whose calculation load is very heavy in MATLAB, which has abundant analysis functions. In this study, we developed four methods to speed up CGH calculation: (1) processing of point clouds as a matrix, (2) construction of a column-pixel matrix, (3) calculation of CGHs with GPU, and (4) construction of a row-pixel matrix. As a result, there was 453 times speeding up in comparison with that with the conventional method.抄録全体を表示PDF形式でダウンロード (1083K)
一般論文
レーザーオリジナル
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三宅 泰広, 日坂 真樹, 松村 雅史, 生田 孝2016 年 44 巻 7 号 p. 464-
発行日: 2016年
公開日: 2020/12/17
ジャーナル オープンアクセスPhase-contrast imaging of living tissues is important for investigating biological structures and functions. Phase-contrast scanning optical microscopy using hollow-cone illumination, annular aperture, and active image processing has been proposed and developed for visualizing low-contrast phase objects. This microscope has such excellent features as separate phase and amplitude imaging, reduced multiscattering effects, spherical aberration-free imaging, and speckle reduction for coherent lasers. A figureof- 8-mid-range enhancement spatial-frequency filter with sign correction extracted linear phase-contrast components, and the reconstructed phase spectrum with superimposed spectra with different angles revealed the phase-contrast structures of the tissue sample. We obtained cross-sectional images along the axial direction and evaluated the microscope’s imaging features.抄録全体を表示PDF形式でダウンロード (536K)
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