Showing papers by "Osamu Matoba published in 2006"
01 Jan 2006
TL;DR: Digital holography is a technique that permits digital capture of holograms and subsequent processing on a digital computer as mentioned in this paper, and various applications of this technique cover three-dimensional (3-D) imaging as well as several problems.
Abstract: Digital holography is a technique that permits digital capture of
holograms and subsequent processing on a digital computer. This
paper reviews various applications of this technique. The presented
applications cover three-dimensional (3-D) imaging as well as several
associated problems. For the case of 3-D imaging, optical and
digital methods to reconstruct and visualize the recorded objects
are described. In addition, techniques to compress and encrypt 3-D
information in the form of digital holograms are presented. Lastly,
3-D pattern recognition applications of digital holography are discussed.
The described techniques constitute a comprehensive approach
to 3-D imaging and processing.
179 citations
13 Mar 2006
TL;DR: Applications of digital holography cover three-dimensional (3-D) imaging as well as several associated problems and optical and digital methods to reconstruct and visualize the recorded objects are described.
Abstract: Digital holography is a technique that permits digital capture of holograms and subsequent processing on a digital computer. This paper reviews various applications of this technique. The presented applications cover three-dimensional (3-D) imaging as well as several associated problems. For the case of 3-D imaging, optical and digital methods to reconstruct and visualize the recorded objects are described. In addition, techniques to compress and encrypt 3-D information in the form of digital holograms are presented. Lastly, 3-D pattern recognition applications of digital holography are discussed. The described techniques constitute a comprehensive approach to 3-D imaging and processing.
169 citations
TL;DR: In this article, the authors proposed a parallel three-step phase-shifting digital holography, which is capable of noiseless instantaneous measurement of three-dimensional objects based on phaseshifting interferometry.
Abstract: We propose parallel three-step phase-shifting digital holography as a technique capable of noiseless instantaneous measurement of three-dimensional objects based on phase-shifting interferometry. The proposed digital holography carries out three-step phase shifting at the same time by using a phase-shifting array device located in the reference beam. The array device has a periodic three-step phase distribution, and its configuration is simplified compared with that required for conventional parallel phase-shifting digital holography. Therefore the optical system of the proposed parallel phase-shifting digital holography is more suitable for the realization of the proposed holography. We conduct both a numerical simulation and a preliminary experiment. The results of the simulation and experiment agree well with those of the conventional phase-shifting method and are superior to the results obtained by conventional digital holography by using the Fresnel transform alone. Thus the effectiveness of the proposed technique is verified.
119 citations
17 Oct 2006
TL;DR: The Transmissive Mirror Device (TMD) as discussed by the authors is a micro-mirror array, which consists of numerous micromirrors placed perpendicular to the surface of a flat, thin metal plate.
Abstract: We propose a new imaging optics called the Transmissive Mirror Device (TMD). It consists of numerous micromirrors
placed perpendicular to the surface of a flat, thin metal plate. The micro-mirror array is implemented
by the inner walls of minute square holes, which are densely pitted on the device. The basic mode of operation
is based on two reflections by a pair of adjacent mutually perpendicular mirrors, i.e., a dihedral corner reflector.
Although the principal of operation is based on reflection by mirrors, the device is also transmissive and deflects
light. Since this imaging system forms a real image at a plane symmetric point, the depth of the 3D image is
inverted. Its optical defects are low optical transmittance and stray light caused by non-reflected light and that
reflected once. We manufactured the device experimentally with nano-precision machining technology and also
evaluated it.
105 citations
TL;DR: The multidimensional imaging system utilizes polarimetric imaging, multispectral imaging, 3D integral imaging with time and space multiplexing, and 3D image-fusion techniques to reconstruct the multidimensionally integrated scene.
Abstract: We describe a multidimensional optical sensor and imaging system (MOSIS). Using a time-multiplexing, polarimetric, and multispectral imaging system, we are able to reconstruct a fully integrated multidimensional scene. Image fusion is used to integrate the multidimensional images. The fused image contains more information than the single two-dimensional and three-dimensional (3D) images. The multidimensional imaging system utilizes polarimetric imaging, multispectral imaging, 3D integral imaging with time and space multiplexing, and 3D image-fusion techniques to reconstruct the multidimensionally integrated scene. Optical experiments and computer simulations are presented.
59 citations
TL;DR: Experimental and numerical results show that reflection-type holographic disk memory has a high potential for terabyte storage capacity as in transmission-type memory and random phase modulation can improve the shift selectivity in shift multiplexing recording as well as in data security.
Abstract: A reflection-type holographic disk memory system with random phase shift multiplexing is proposed. The experimental results show that a binary data page of 18x17 bits is recorded successfully at intervals of 4 mum in a Fe:LiNbO3 crystal with a thickness of 0.5 mm when six data pages are superimposed. Numerical results show that random phase modulation can improve the shift selectivity in shift multiplexing recording as well as in data security. Experimental and numerical results show that reflection-type holographic disk memory has a high potential for terabyte storage capacity as in transmission-type memory.
29 citations
TL;DR: The results show that the information processing is effective in such manipulations of 3DObjects for elimination and addition of information by modifying the complex amplitude.
Abstract: A three-dimensional (3D) digital holographic display system with image processing is presented. By use of phase-shifting digital holography, we obtain the complex amplitude of a 3D object at a recording plane. Image processing techniques are introduced to improve the quality of the reconstructed 3D object or manipulate 3D objects for elimination and addition of information by modifying the complex amplitude. The results show that the information processing is effective in such manipulations of 3D objects. We also show a fast recording system of 3D objects based on phase-shifting digital holography for display with image processing. The acquisition of 3D object information at 500 Hz is demonstrated experimentally.
22 citations
TL;DR: In this article, a needle-fiber optical coherence tomography (OCT) system designed for guiding epidural anesthesia to a target is presented, where a desired target in tofu as a strong scattering medium can be monitored over a sufficient range of several millimeters within a short measuring time.
Abstract: A needle-fiber optical coherence tomography (OCT) system designed for guiding epidural anesthesia to a target is presented. In the preliminary experiment, a desired target in tofu as a strong scattering medium can be monitored over a sufficient range of several millimeters within a short measuring time. The axial resolution is 21 μm. In order to investigate the ranging performance, the relation between background noise levels and focus-scattering properties in a confocal optical system is numerically studied by use of Monte Carlo technique. Numerical results indicate that an appropriate focal length of the lens attached to the fiber should be used to separate the OCT signal from strong noise in strongly scattered medium.
4 citations
01 Jan 2006
TL;DR: This paper aims to demonstrate the efforts towards in-situ applicability of EMMARM, which aims to provide real-time information about the physical properties of E-modulus and its applications in the oil and gas industry.
Abstract: Yann Frauel, Enrique Tajahuerce, Osamu Matoba, Albertina Castro, and Bahram Javidi IIMAS, Universidad Nacional Aut onoma de M exico, Mexico Departament de Ciencies Experimentals, Universitat Jaume I, Spain Department of Computer and System Engineering, Kobe University, Japan Instituto Nacional de Astrof sica, Optica y Electr onica, Mexico Department of Electrical and Computer Engineering, University of Connecticut, USA
3 citations
17 Oct 2006
TL;DR: The experimental results showed that a sum of absolute difference method provides desired depth maps and 3D objects are reconstructed successfully in the numerical reconstruction of the proposed three-dimensional imaging system.
Abstract: A three-dimensional (3D) imaging system which consists of an equipment for stereo vision capturing and optical wavefront recontruction is developed. In the system, after acquisition of stereo images, depth maps are calculated by means of an area-based stereo matching algorithm. Hologram pattern is generated from the obtained depth maps with digital signal processing and displayed on a spatial light modulator. A three-dimensional image is reconstructed by illuminating plane wave of coherent light to the modulator. The attractve feature of the imaging system is to contstruct a holographic display without an optical interferometer for hologram recording. We fabricate a prototype of a stereo vision equipment and capture a target object. To obtain the depth map, we apply various methods of area-based stereo maching. The experimental results showed that a sum of absolute difference method provides desired depth maps. We calcuate an in-line hologram pattern with electronic signal processing. In the numerical reconstruction, 3D objects are reconstructed successfully. These results have shown usefulness of the proposed system.
1 citations
01 Oct 2006
TL;DR: Numerical results show the effectiveness of the technique to obtain fully complex amplitude of three-dimensional object from single digital hologram and intensity distribution of the object at the hologram plane.
Abstract: We propose a technique to obtain fully complex amplitude of three-dimensional object from single digital hologram and intensity distribution of the object at the hologram plane. Numerical results show the effectiveness of the technique.
16 Oct 2006
TL;DR: Holographic three‐dimensional(3D) display system with data processing techniques is presented and phase shifting digital holography, the complex amplitude of 3D object is obtained.
Abstract: Holographic three‐dimensional(3D) display system with data processing techniques is presented By use of phase shifting digital holography, the complex amplitude of 3D object is obtained Data processing techniques in complex amplitude are introduced to improve the quality of reconstructed 3D object or manipulate 3D objects Elimination and addition of objects are presented
TL;DR: In this article, an optical identification system based on a 3D phase object is presented, which uses two speckle patterns of the 3D object obtained by illuminating two wavelengths.
Abstract: An optical identification system based a three-dimensional (3D) phase object is presented. The identification is implemented by the correlation between a speckle pattern of the 3D phase object and stored speckle patterns. To achieve a high level of recognition, we use two speckle patterns of the 3D object obtained by illuminating two wavelengths. Experimental and numerical results are presented to show the effectiveness of the proposed system.
TL;DR: The presented system achieves massive data processing for mulitiplier modulo in parallel with only simple implementation and shows experimental results to verify usefulness of the presented method.
Abstract: A novel method for multiplier modulo using optical signal processing is presented. Multiplier modulo is an important process in a factorization algorithm. In the method, modulo operations are executed by phase modulation. We construct a prototype system of the presented method. The constructed system consists of a Michelson interferometer with a photo detector array. In the system, mirrors are put on both object and reference arms. A mirror in the object arm is slightly tilted and the angle depends on parameters for target multiplier modulo. An obtained interference fringe has information about desired results for modulo operations. The most feature of the presented system is that it achieves massive data processing for mulitiplier modulo in parallel with only simple implementation. We show experimental results to verify usefulness of the presented method. Moreover, we study on expansion to implement factorization.
01 Oct 2006
TL;DR: An electronic parallel processor for exponential modulo function based on digital optical computing is designed and implemented on a FPGA device, and a prototype system for the presented method can be demonstrated.
Abstract: An electronic parallel processor for exponential modulo function based on digital optical computing is designed. As a result of implementation on a FPGA (Field Programmable Gate Array) device, a prototype system for the presented method can be demonstrated.
01 Jan 2006
01 Oct 2006
TL;DR: A quantum algorithm for character recognition based on quantum superposition and quantum entanglement is proposed in this article, where the probability in the desired state will be almost 1 by iterative quantum correlation and observation.
Abstract: A quantum algorithm for character recognition based on quantum superposition and quantum entanglement is proposed. Numerical results show that the probability in the desired state will be almost 1 by iterative quantum correlation and observation.
TL;DR: In this paper, two methods of changing the transmittance in the defect mode are presented, and the extinction ratio between on and off states are numerically analyzed using plane waves and Gaussian beams.
Abstract: Optical switching elements using controllable defect modes in one-dimensional photonic crystals are proposed. The transmittance in a defect mode is markedly changed by modifying the local structure of the photonic crystals. Such modification is implemented by micro electro mechanical systems (MEMS) or optical manipulation. We present two methods of changing the transmittance in the defect mode. The spectral transmittance and peak wavelength in the defect mode, and the extinction ratio between on and off states are numerically analyzed using plane waves and Gaussian beams. Numerical results show that the extinction ratio is about 40 dB in 43 layers of SiO2 and air with a thickness of 6.8 µm.
TL;DR: In this article, a full-field optical coherence tomography (OCT) system that can control longitudinal resolution is presented, which is based on the synthesis of the coherence function from the wavelength scanning of laser light within a frame time of an imaging device.
Abstract: A full-field optical coherence tomography (OCT) system that can control longitudinal resolution is presented. The system is based on the synthesis of the optical coherence function from the wavelength scanning of laser light within a frame time of an imaging device. On the basis of the results of our experiments, it is confirmed that our system can select any longitudinal resolution between 6–120 µm and that this performance is available for practical use such as for the tomographic imaging of various sizes of targets in a scattering medium.
01 Oct 2006
TL;DR: In this article, a high-density recording method to record reflection-type holograms in a volume of a recording medium was investigated, and three-dimensional shift selectivity in a LiNbO3crystal with a thickness of 0.5 mm was presented.
Abstract: We investigated a high-density recording method to record reflection-type holograms in a volume of a recording medium. Three-dimensional shift selectivity in a LiNbO3crystal with a thickness of 0.5 mm was presented. Experimental results showed three-dimensional shift selectivity of a reflection hologram is 0.97mumtimes0.97mumtimes8.8mum with a wavelength of 514.5 nm and Fourier transform lenses with NAs of 0.28