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IEEE International Conference on Environment and Electrical Engineering

作者： Radu-Stefan Ricman Roland Szabo Aurel Gontean Applied Electronics Department Politehnica University Timisoara Timisoara Romania

This paper presents an analysis of code implementation performance for image processing algorithms. The test is made for image processing algorithms for robotic arms, but it is suitable for any type of image processing software. image processing software can use quite big amount of resources, so this way it can be tested which platform, which operating system or which programming language is the most suitable for usage. The image processing task is a color detection task with some line and circle overlays for robotic arm's guidance. The implementations were tested base on code line numbers, code size on disk, binary file size on disk, used memory during execution and used CPU during execution.

关键词： code execution code size image processing algorithms performance comparison resource utilization robotic arm control software implementation

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Comparison and evaluation of geometric calibration methods for infrared cameras to perform metric measurements on a plane

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APPLIED OPTICS 2018年第18期57卷 D1-D10页

作者： Usamentiaga, R. Ibarra-Castanedo, C. Maldague, X. Univ Oviedo Dept Comp Sci & Engn Gijon 33204 Spain Laval Univ Comp Vis & Syst Lab Quebec City PQ G1 V 0A6 Canada

Geometric information from infrared images can complement the information about the measured infrared radiation. However, this requires geometric camera calibration. In this work, three calibration methods for infrared cameras are compared: a direct and an iterative estimation of the transformation between image and world coordinates and a complete camera calibration method using a specifically designed calibration target. The three methods are compared and the obtained performance for metric measurements on a plane is evaluated. The results indicate acceptable performance in the three cases, with the complete method clearly outperforming the two others with an average error of only 0.060 mm, which represents 0.08% error of the measured distance. (C) 2018 Optical Society of America

关键词： Camera calibration image processing algorithms Infrared imaging Infrared radiation Nondestructive testing Visible light

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Perceptually uniform color space for image signals including high dynamic range and wide gamut

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OPTICS EXPRESS 2017年第13期25卷 15131-15151页

作者： Safdar, Muhammad Cui, Guihua Kim, Youn Jin Luo, Ming Ronnier Zhejiang Univ State Key Lab Modern Opt Instrumentat Hangzhou 310027 Zhejiang Peoples R China COMSATS Inst Informat Technol Dept Comp Sci Sahiwal 57000 Pakistan Wenzhou Univ Sch Phys & Elect Informat Engn Wenzhou 325035 Peoples R China Huawei Technol Co Ltd Shanghai 201206 Peoples R China Univ Leeds Sch Design Leeds LS2 9JT W Yorkshire England

A perceptually uniform color space has been long desired for a wide range of imaging applications. Such a color space should be able to represent a color pixel in three unique and independent attributes (lightness, chroma, and hue). Such a space would be perceptually uniform over a wide gamut, linear in iso-hue directions, and can predict both small and large color differences as well as lightness in high dynamic range environments. It would also have minimum computational cost for real time or quasi-real time processing. Presently available color spaces are not able to achieve these goals satisfactorily and comprehensively. In this study, a uniform color space is proposed and its performance in predicting a wide range of experimental data is presented in comparison with the other state of the art color spaces. (C) 2017 Optical Society of America

关键词： CIE color spaces Color difference Color spaces image processing image processing algorithms image quality

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Robust motion-free and error-correcting method of estimating the focal length of a lens

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APPLIED OPTICS 2017年第2期56卷 342-353页

作者： Reza, Syed Azer Anjum, Arslan Lahore Univ Management Sci Dept Elect Engn DHA Phase 2Sect U Lahore 54792 Pakistan Masdar Inst Sci & Technol Dept Elect Engn & Comp Sci Abu Dhabi U Arab Emirates

This paper presents a motion-free technique to characterize the focal length of any spherical convex or concave lens. The measurement test-bench uses a Gaussian laser beam, an electronically controlled variable focus lens (ECVFL), a digital micro-mirror device (DMD), and a standard photo-detector (PD). The method requires measuring beam spot sizes for different focal length settings of the ECVFL and using the measurement data to obtain a focal length estimate through an iterative least-squares-based curve-fitting algorithm. The method is also shown to overcome potential measurement errors that arise due to inaccurate placement of optical components on the test-bench as well as unknown principal plane locations of asymmetric lens samples such as plano-convex lenses. Contrary to the commercially deployed and other proposed methods of focal length characterization, this method does not involve any bulk mechanical motion of optical elements. This approach eliminates measurement errors due to gradual mechanical wear and tear and improves measurement repeatability by minimizing mechanical hysteresis. The compact and fully automated method delivers fast, repeatable, and reliable measurements, which we believe makes it ideal for deployment in industrial lens production units and characterizing lenses used in sensitive imaging systems and various other optical experiments and systems. Measured focal lengths are within the 1% manufacturer-provided tolerance values showing excellent agreement between theory and experiments. We also demonstrate measurement robustness by rectifying discrepancies between known and actual separation distances on the measurement test bench. (C) 2017 Optical Society of America

关键词： image processing algorithms Imaging systems Optical components Optical elements Optical systems Optical testing

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Precise calibration of pupil images in pyramid wavefront sensor

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APPLIED OPTICS 2017年第12期56卷 3281-3286页

作者： Liu, Yong Mu, Quanquan Cao, Zhaoliang Hu, Lifa Yang, Chengliang Xuan, Li Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys State Key Lab Appl Opt Changchun 130033 Peoples R China Univ Chinese Acad Sci Beijing 100039 Peoples R China

The pyramid wavefront sensor (PWFS) is a novel wavefront sensor with several inspiring advantages compared with Shack-Hartmann wavefront sensors. The PWFS uses four pupil images to calculate the local tilt of the incoming wavefront. Pupil images are conjugated with a telescope pupil so that each pixel in the pupil image is diffraction-limited by the telescope pupil diameter, thus the sensing error of the PWFS is much lower than that of the Shack-Hartmann sensor and is related to the extraction and alignment accuracy of pupil images. However, precise extraction of these images is difficult to conduct in practice. Aiming at improving the sensing accuracy, we analyzed the physical model of calibration of a PWFS and put forward an extraction algorithm. The process was verified via a closed-loop correction experiment. The results showed that the sensing accuracy of the PWFS increased after applying the calibration and extraction method. (c) 2017 Optical Society of America

关键词： Adaptive optics image processing algorithms Large telescopes Liquid crystal modulators Pupil Wavefront aberrations

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Accurate 3D autostereoscopic display using optimized parameters through quantitative calibration

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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS image SCIENCE AND VISION 2017年第5期34卷 804-812页

作者： Fan, Zhencheng Chen, Guowen Xia, Yan Huang, Tianqi Liao, Hongen Tsinghua Univ Sch Med Dept Biomed Engn Beijing 100084 Peoples R China

Quality of three-dimensional (3D) autostereoscopic displays is mainly influenced by the mismatch between the optical apparatus setups and image generation algorithms. In this paper, we take the optical apparatus setups into consideration and present an accurate 3D autostereoscopic display method using optimized parameters through quantitative calibration. Rotational and translational alignments are operated quantitatively to rectify the optical apparatus. In addition, the main parameters in a 3D display are evaluated for accurate 3D image rendering. Using the proposed method, the 3D autostereoscopic display can be calibrated quantitatively and provide 3D images with accurate spatial information. Experiments verified the availability and feasibility of the proposed method. (C) 2017 Optical Society of America

关键词： Crystalline lens image processing image processing algorithms Integral photography Refractive index Three dimensional displays

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3D second harmonic generation imaging tomography by multi-view excitation

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OPTICA 2017年第10期4卷 1171-1179页

作者： Campbell, Kirby R. Wen, Bruce Shelton, Emily M. Swader, Robert Cox, Benjamin L. Eliceiri, Kevin Campagnola, Paul J. Univ Wisconsin Dept Biomed Engn Lab Opt & Computat Instrumentat 1550 Engn Dr Madison WI 53706 USA Morgridge Inst Res 330 N Orchard St Madison WI 53715 USA

Biological tissues have complex 3D collagen fiber architecture that cannot be fully visualized by conventional second harmonic generation (SHG) microscopy due to electric dipole considerations. We have developed a multi-view SHG imaging platform that successfully visualizes all orientations of collagen fibers. This is achieved by rotating tissues relative to the excitation laser plane of incidence, where the complete fibrillar structure is then visualized following registration and reconstruction. We evaluated high frequency and Gaussian weighted fusion reconstruction algorithms, and found the former approach performs better in terms of the resulting resolution. The new approach is a first step toward SHG tomography. (C) 2017 Optical Society of America

关键词： image processing image processing algorithms image quality Light sheet microscopy Reconstruction algorithms Ti:sapphire lasers

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Optomechanical design of a portable compact bidirectional texture function measurement instrument

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APPLIED OPTICS 2017年第4期56卷 1183-1193页

作者： Hosek, Jan Havran, Vlastimil Nemcova, Sarka Bittner, Jiri Cap, Jiri Czech Tech Univ Fac Mech Engn Dept Instrumentat & Control Engn Tech 4 CR-16635 Prague Czech Republic Czech Tech Univ Fac Elect Engn Dept Comp Graph & Interact Karlovo Nam 13 CR-16635 Prague Czech Republic

Recent developments in optoelectronics and material processing techniques make it possible to design and produce a portable and compact measurement instrument for bidirectional texture function (BTF). Parallelized optics, on-board data processing, rapid prototyping, and other nonconventional production techniques and materials were the key to building an instrument capable of in situ measurements with fast data acquisition. We designed, built, and tested a prototype of a unique portable and compact multi-camera system for BTF measurement which is capable of in situ measurement of temporally unstable samples. In this paper, we present its optomechanical design. (C) 2017 Optical Society of America

关键词： image processing algorithms Optical components Optical standards Optomechanical design Optomechanics Surface light scattering

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Single-spot two-dimensional displacement measurement based on self-mixing interferometry

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OPTICA 2017年第7期4卷 729-735页

作者： Zhu, Kaiyi Guo, Bo Lu, Yueyue Zhang, Shulian Tan, Yidong Tsinghua Univ State Key Lab Precis Measurement Technol & Instru Dept Precis Instrument Beijing 100084 Peoples R China

The simultaneous and independent measurements of in-plane and out-of-plane displacements are significant issues to be solved in research. Here a novel system to realize single-spot two-dimensional (2D) displacement measurement of a noncooperative target is reported. The performance of the system is tested in the displacement measurement of an aluminum target with a rough surface. 2D random movement and 2D movement with different parameters of Lissajous figures are measured by the system. The ranges of the 2D displacement measurement reach 500 mu m and the accuracies reach the submicron scale. The resolutions of the two dimensions are all better than 5 nm. The measurement system is based on laser heterodyne self-mixing interferometry with frequency multiplexing, which has advantages such as noncontact, nondestruction, nanometer-scale resolution and high sensitivity. The method is promising to be applied in 2D deformation tests of materials, 2D rotor vibration measurement, 2D positioning of particles, thermal expansion coefficient measurement, and other applications. (C) 2017 Optical Society of America

关键词： image processing algorithms Laser beams Laser interferometry Laser sensors Speckle interferometry Three dimensional measurement

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Lensless complex amplitude image retrieval through a visually opaque scattering medium

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APPLIED OPTICS 2017年第16期56卷 4591-4597页

作者： Das, Bhargab Bisht, Nandan S. Vinu, R. V. Singh, Rakesh Kumar Cent Sci Instruments Org CSIR Adv Mat & Sensors Div Sect 30-C Chandigarh 160030 India Kumaun Univ Dept Phys SSJ Campus Almora 263601 Uttarakhand India Indian Inst Space Sci & Technol Dept Phys Appl & Adapt Opt Lab Trivandrum 695547 Kerala India

We propose and experimentally demonstrate lensless complex amplitude image retrieval through a visually opaque scattering medium from spatially fluctuating fields using intensity measurement and a phase-retrieval algorithm. The complex amplitude information of the hidden object is encoded in the form of a real and non-negative amplitude function represented as an interference pattern. A single charge coupled device (CCD) image of the scattered light collected through a visually opaque optical diffuser contains enough information to digitally regenerate the interference pattern. Furthermore, a lensless configuration is implemented which eliminates any possible aberration effects associated with optical components, and this further has promising applications where the use of imaging optics is not feasible. Experimental results for the recovery of complex fields corresponding to optical vortices of two different topological charges are presented. (C) 2017 Optical Society of America

关键词： image processing algorithms Medical imaging Optical components Optical fields Speckle noise Speckle patterns

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