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  • An Augmented Reality Head-Up Display System with a Wide-View Eyebox
    Int. J. Opt. (IF 0.867) Pub Date : 2020-06-30
    Pei-Jung Wu; Chih-Hao Chuang; Chien-Yu Chen; Jeng-Han Wu; Bor-Shyh Lin

    This study proposes to apply the combination of two 90-degree prisms and a holographic optical element to an image-dividing element, divide an image into three through the virtual image projection system, and accurately project the images to 160 cm behind the windshield. In order to distinguish the left image, middle image, and right image at the horizontal direction, the 90-degree prism is first utilized

    更新日期:2020-06-30
  • Motion Deblurring in Image Color Enhancement by WGAN
    Int. J. Opt. (IF 0.867) Pub Date : 2020-06-24
    Jiangfan Feng; Shuang Qi

    Motion deblurring and image enhancement are active research areas over the years. Although the CNN-based model has an advanced state of the art in motion deblurring and image enhancement, it fails to produce multitask results when challenged with the images of challenging illumination conditions. The key idea of this paper is to introduce a novel multitask learning algorithm for image motion deblurring

    更新日期:2020-06-24
  • An Analytical Study of the Diffraction of Light by a Circular Aperture Using Spherical Harmonics for
    Int. J. Opt. (IF 0.867) Pub Date : 2020-06-09
    Mahmoud Ahmad; Najah Kabalan; Samar Omran

    Based on the importance of spherical harmonics and their applicability in many physical problems, this research aimed to study the diffraction pattern of light by a circular aperture starting from the first Rayleigh–Sommerfeld diffraction equation and to expand the polar radius of a point on the surface of the circular aperture based on spherical harmonics. We depended on this theoretical framework

    更新日期:2020-06-09
  • A Novel Statistical Feature Analysis-Based Global and Local Method for Face Recognition
    Int. J. Opt. (IF 0.867) Pub Date : 2020-06-01
    Mohammed Ahmed Talab; Suryanti Awang; Mohd Dilshad Ansari

    Face recognition from an image/video has been a fast-growing area in research community, and a sizeable number of face recognition techniques based on texture analysis have been developed in the past few years. Further, these techniques work well on gray-scale and colored images, but very few techniques deal with binary and low-resolution images. As the binary image is becoming the preferred format

    更新日期:2020-06-01
  • A Unified Shape-From-Shading Approach for 3D Surface Reconstruction Using Fast Eikonal Solvers
    Int. J. Opt. (IF 0.867) Pub Date : 2020-05-29
    Guohui Wang; Xuan Zhang; Jin Cheng

    Object shape reconstruction from images has been an active topic in computer vision. Shape-from-shading (SFS) is an important approach for inferring 3D surface from a single shading image. In this paper, we present a unified SFS approach for surfaces of various reflectance properties using fast eikonal solvers. The whole approach consists of three main components: a unified SFS model, a unified eikonal-type

    更新日期:2020-05-29
  • An Empirical Model of Angle-of-Arrival Variance for a Gaussian Wave Propagation through Non-Kolmogorov Turbulence
    Int. J. Opt. (IF 0.867) Pub Date : 2020-05-26
    Chao Gao; Libin Jiao; Xiaofeng Li

    This paper proposes an empirical model of the angle-of-arrival (AOA) variance for a Gaussian wave propagating through the weak non-Kolmogorov turbulence. The proposed model is approximately expressed as the linear weighted average between the AOA variances of the plane and spherical waves. The Monte Carlo method is applied to validate the proposed model. The numerical simulations indicate that, under

    更新日期:2020-05-26
  • The Quantum Analysis of Nonlinear Optical Parametric Processes with Thermal Reservoirs
    Int. J. Opt. (IF 0.867) Pub Date : 2020-05-14
    Tamirat Abebe; Nebiyu Gemechu; Chimdessa Gashu; Kebede Shogile; Solomon Hailemariam; Shimelis Adisu

    In this paper, employing the stochastic differential equations associated with the normal ordering, the quantum properties of a nondegenerate three-level cascade laser with a parametric amplifier and coupled to a two-mode thermal reservoir are thoroughly analyzed. Particularly, the enhancement of squeezing and the amplification of photon entanglement of the two-mode cavity light are investigated. It

    更新日期:2020-05-14
  • On Anomalous Fluorescence of Symmetrical Polymethine Dyes
    Int. J. Opt. (IF 0.867) Pub Date : 2020-05-14
    P. O. Kondratenko; Yu. M. Lopatkin

    The group-theoretical analysis of polymethine dyes (PMD) showed that relaxation processes between the states S3 and S1 are forbidden, either by radiation or by internal conversion. From the state S3, only transition to the ground state of the molecule is possible. Since the experimental data state that the quantum yield of S3 ⟶ S0 fluorescence does not exceed 1%, it is indicated that the internal conversion

    更新日期:2020-05-14
  • Three-Dimensional Reconstruction of Mechanical Parts Based on Digital Holography
    Int. J. Opt. (IF 0.867) Pub Date : 2020-05-01
    Yaohui Dai; Haiyu Wu; Gang Zhu; Yan Yang

    In reconstruction of the off-axis digital hologram of diffuse reflection objects, the position of the positive first-order image cannot be accurately obtained because of the low quality of the reconstruction image. This paper focuses on the above problem and proposes a method for marking the first-order image of the 1-FFT surface based on the fast Fourier transform (1-FFT). The parameters of angle

    更新日期:2020-05-01
  • Synthesis and Luminescence Properties of SrGd2O4:Eu3+ Red Phosphors
    Int. J. Opt. (IF 0.867) Pub Date : 2020-04-14
    Jun-Feng Wang; Hao Zu; Chuan-Wen Lin; Shou-Jun Ding; Peng-Yu Shao; Ye Xia

    As one of the important raw materials for LED products, phosphors play an important role. At present, the spectrum of LED phosphors lacks red light, resulting in poor quality of white LED products and a low color rendering index (Ra <80), which affects lighting effects. To solve this problem, we synthesized the SrGd2O4:Eu3+ red phosphor by a high-temperature solid-phase method. The structure and luminescence

    更新日期:2020-04-14
  • A Strategy for Improving the Quality of Ghost Imaging
    Int. J. Opt. (IF 0.867) Pub Date : 2020-04-09
    Xin Liu; Su Bo; Zhiyuan Ye; Panghe Qiu; Jing Ding

    A new method is proposed to improve the signal-to-noise ratio (SNR) of regions of interest (ROIs) in a ghost imaging (GI) system with uneven speckle illumination. The imaging results in a GI system can be distorted when there is an uneven distribution of light. In this study, three thin-film polarizers are used to create illumination patterns in uneven light intensity distribution. In particular, the

    更新日期:2020-04-09
  • Realization of the Radiance Scale Using Transfer Function of the Laser-Based Optical System
    Int. J. Opt. (IF 0.867) Pub Date : 2020-04-01
    M. Kilin; H. Tutunculer; O. Bazkir; S. Meric

    This work aims to determine the radiance responsivity to be used in the calibration of polychromatic radiation sources with low uncertainty. To realize the radiance, Ar-ion, He-Ne, and Nd-YAG lasers as well as an integrating sphere with a 0.15 m diameter are used to obtain radiation sources having Lambertian distributions. Then, a silicon photodiode-based reflection-type trap detector with calibrated

    更新日期:2020-04-01
  • Swimmer’s Head Detection Based on a Contrario and Scaled Composite JTC Approaches
    Int. J. Opt. (IF 0.867) Pub Date : 2020-04-01
    D. Benarab; T. Napoléon; A. Alfalou; A. Verney; P. Hellard

    In order to accompany the swimming coaches in evaluating high-level swimmers, we developed a prototype for instantaneous speed estimation. To achieve this, we proposed and validated, in a previous work, a swimmer tracking system based on data fusion. However, the initialization phase is done manually, and our aim, in this paper, is to automate this process. First, we propose a region of interest localization

    更新日期:2020-04-01
  • Design of Counter Beam Tunnel Lights for CIE 88 : 2004 Regulation in Threshold Zone
    Int. J. Opt. (IF 0.867) Pub Date : 2020-03-30
    Ming-Jui Chen; Hien-Thanh Le; Lanh-Thanh Le; Wei-Hsiung Tseng; Wei-Yang Lee; Si-Yuan Chen; Sheng-Yen Chen; Hsing-Yuan Liao; Yung-Cheng Li; Hsiao-Yi Lee

    To enhance driving safety, a counter beam light is proposed to meet CIE (International Commission on Illumination) specifications for tunnel lighting. The proposed new counter beam light (CBL) acts as a qualified counter beam light to help tunnel road lighting meet the CIE 88 : 2004 regulation standard in the threshold zone in both simulation and in practice. Through appropriate arrangements of the

    更新日期:2020-03-30
  • The Influence of LED Lighting on Attention and Long-Term Memory
    Int. J. Opt. (IF 0.867) Pub Date : 2020-03-23
    Chung Won Lee; Jin Ho Kim

    The fact that the illuminance of LED lights affects human attention and long-term memory has been verified through various studies, but there are no consistent research results about what level of illuminance is effective. The aims of this study were to systematically verify the effects of LED lighting on attention and long-term memory. The experiment was designed with four illuminance levels—300 lx

    更新日期:2020-03-23
  • An Intelligent Model for Facial Skin Colour Detection
    Int. J. Opt. (IF 0.867) Pub Date : 2020-03-17
    Chih-Huang Yen; Pin-Yuan Huang; Po-Kai Yang

    There is little research on the facial colour; for example, choice of cosmetics usually was focused on fashion or impulse purchasing. People never try to make right decision with facial colour. Meanwhile, facial colour can be also a method for health or disease prevention. This research puts forward one set of intelligent skin colour collection method based on human facial identification. Firstly,

    更新日期:2020-03-17
  • Investigation of the Atmospheric Attenuation Factors in FSO Communication Systems Using the Taguchi Method
    Int. J. Opt. (IF 0.867) Pub Date : 2020-03-12
    Pelin Demir; Güneş Yılmaz

    In this study, Mie and Rayleigh scattering in free space optics (FSO) communication systems were investigated in terms of the atmospheric attenuation. Because of the movement of the Earth, the communication distance and surrounding gas densities are inconsistent in each region. This change leads to atmospheric attenuation and then data losses and inefficient communication in FSO occur. Therefore, the

    更新日期:2020-03-12
  • Theoretical Analysis of a Novel WDM Optical Long-Haul Network Using the Split-Step Fourier Method
    Int. J. Opt. (IF 0.867) Pub Date : 2020-03-01
    Mounia Chakkour; Otman Aghzout; Fahd Chaoui

    In this paper, a new optical transmission model was investigated and developed in order to improve the performance of Wavelength Division Multiplexing optical transmission systems. For this purpose, an efficient theoretical method combining a Fiber Bragg Grating (FBG) and Erbium Doped Fiber Amplifier (EDFA) was implemented. Enhancements on the transmitted signal amplitudes with important compensation

    更新日期:2020-03-01
  • Simultaneous Measurement of In-Plane and Out-of-Plane Displacements Using Talbot Fringe Projection
    Int. J. Opt. (IF 0.867) Pub Date : 2020-02-26
    Haibin Sun; Tingting Liu

    The fringe projection technique has been widely used in optical measurements. In this paper, we demonstrate a scheme to measure the 3D displacement of a deformed sample using Talbot fringe projection. In this process, we designed a two-dimensional square Talbot hologram. In this approach, we used the basic principle of triangulation, and a computer-controlled liquid crystal spatial light modulator

    更新日期:2020-02-26
  • Research on Degradation of GaN-Based Blue LED Caused by γ Radiation under Low Bias
    Int. J. Opt. (IF 0.867) Pub Date : 2020-02-24
    Qifeng Zhao; Xiangyang Lu; Fajun Yu; Jinglei Xu; Zeping Fang; Xiao-yong Liu

    GaN multiquantum-well blue light-emitting diodes (LEDs) were radiated with 60Co γ-rays for accumulated doses up to 2.5 Mrad (SiO2). The radiation-induced current and 1/f noise degradations were studied when the devices operate at the low bias voltage. The current increased by 2.31 times, and the 1/f noise increased by 275.69 times after a dose of 2.5 Mrad (SiO2). Based on Hurkx’s trap-assisted tunneling

    更新日期:2020-02-24
  • Q-Switched and Mode-Locked Nd/Cr:YAG Ceramic Pulse Laser
    Int. J. Opt. (IF 0.867) Pub Date : 2020-02-14
    T. Saiki; N. Hirota; S. Kanemori; Y. Iida

    A mode-locked and Q-switched short pulse laser using the Nd3+/Cr3+:YAG ceramic has been constructed with a SESAM and Cr4+:YAG crystal optical switch based on excite state absorption (ESA). Laser oscillations of the pulse laser were observed experimentally. The Nd/Cr:YAG ceramic laser has a high conversion efficiency from white light (such as lamp light or solar light) to the laser. The Nd/Cr:YAG ceramic

    更新日期:2020-02-14
  • High-Energy Passive Mode-Locking of Fiber Lasers.
    Int. J. Opt. (IF 0.867) Pub Date : 2012-08-07
    Edwin Ding,William H Renninger,Frank W Wise,Philippe Grelu,Eli Shlizerman,J Nathan Kutz

    Mode-locking refers to the generation of ultrashort optical pulses in laser systems. A comprehensive study of achieving high-energy pulses in a ring cavity fiber laser that is passively mode-locked by a series of waveplates and a polarizer is presented in this paper. Specifically, it is shown that the multipulsing instability can be circumvented in favor of bifurcating to higher-energy single pulses

    更新日期:2019-11-01
  • Effect of fluorescent particle size on the modulation efficiency of ultrasound-modulated fluorescence.
    Int. J. Opt. (IF 0.867) Pub Date : 2012-01-01
    Yuan Liu,Baohong Yuan,Joseph Vignola

    To investigate whether the size of fluorescent particles affects the modulation efficiency of ultrasound-modulated fluorescence (UMF), we measured UMF and DC (direct current) signals of the fluorescence emission from four different sized fluorescent particles: (1) three carboxylate-modified fluorescent microspheres (FM) with diameters of 20 nm, 200 nm, and 1.0 µm and (2) streptavidin-conjugated Alexa

    更新日期:2019-11-01
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