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Volume 44, Issue 7
Special Issue on Entitled by “State-of-the-Art 3D Television Techniques Based on Holography and Perspectives”
Displaying 1-12 of 12 articles from this issue
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Special Issue on Entitled by State-of-the-Art 3D Television Techniques Based on Holography and Perspectives
Special Issue
Laser Review
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Osamu MATOBA2016 Volume 44 Issue 7 Pages 412-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSA 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.View full abstractDownload PDF (183K) -
Yasuhiro TAKAKI2016 Volume 44 Issue 7 Pages 413-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSHolography 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.View full abstractDownload PDF (956K) -
Osamu MATOBA, Kazunobu MASUDA2016 Volume 44 Issue 7 Pages 418-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSA 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.View full abstractDownload PDF (721K) -
Tomoyoshi SHIMOBABA, Takashi KAKUE, Tomoyoshi ITO2016 Volume 44 Issue 7 Pages 423-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSThis 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.View full abstractDownload PDF (564K) -
Yutaka MORI, Takanori NOMURA2016 Volume 44 Issue 7 Pages 429-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSA 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.View full abstractDownload PDF (841K) -
Hiroshi KIKUCHI, Kenji MACHIDA2016 Volume 44 Issue 7 Pages 434-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSHolography 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.View full abstractDownload PDF (511K) -
Nobuyuki HASHIMOTO2016 Volume 44 Issue 7 Pages 439-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSLiquid 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.View full abstractDownload PDF (934K)
Laser Original
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Ryusuke TORITANI, Peng XIA, Kouichi NITTA, Osamu MATOBA2016 Volume 44 Issue 7 Pages 444-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESS -
Yuki NAGAHAMA, Tomoyoshi SHIMOBABA, Tetsuya KAWASHIMA, Takashi KAK ...2016 Volume 44 Issue 7 Pages 449-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSThe 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.View full abstractDownload PDF (969K) -
Marie SANO, Junichi ITOI, Tomoyoshi SHIMOBABA, Shin ABIRU, Yutaka ...2016 Volume 44 Issue 7 Pages 454-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSA 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).View full abstractDownload PDF (998K) -
Atsushi NEO, Takashi KAKUE, Yutaka ENDO, Tomoyoshi SHIMOBABA, Tomo ...2016 Volume 44 Issue 7 Pages 458-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSWe 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.View full abstractDownload PDF (1083K)
Regular Paper
Laser Original
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Yasuhiro MIYAKE, Masaki HISAKA, Masafumi MATSUMURA, Takashi IKUTA2016 Volume 44 Issue 7 Pages 464-
Published: 2016
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSPhase-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.View full abstractDownload PDF (536K)
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