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33rd IEEE/ACM International Conference on Computer-Aided Design (ICCAD)

作者： Deest, Gael Yuki, Tomofumi Sentieys, Olivier Derrien, Steven Univ Rennes 1 F-35014 Rennes France Inria Rocquencourt France

ISBN: (纸本)9781479962785

In embedded systems, many numerical algorithms are implemented with fixed-point arithmetic to meet area cost and power constraints. Fixed-point encoding decisions can significantly affect cost and performance. To evaluate their impact on accuracy, designers resort to simulations. Their high running-time prevents thorough exploration of the design-space. To address this issue, analytical modeling techniques have been proposed, but their applicability is limited by scalability issues. In this paper, we extend these techniques to a larger class of programs. We use polyhedral methods to extract a more compact, graph-based representation of the program. We validate our approach with a several image and signal processing algorithms.

关键词： embedded systems fixed point arithmetic floating point arithmetic graph theory signal processing analytical modeling techniques area cost constraints fixed-point arithmetic fixed-point conversion fixed-point encoding decisions floating-point conversion graph-based representation image processing algorithms polyhedral methods power constraints scalability issues scalable source level accuracy analysis signal processing algorithms Accuracy Arrays Convolution Convolutional codes Equations Kernel Mathematical model Fixed-point arithmetic Embedded systems Signal processing algorithms floating point arithmetic Fixed point image processing algorithm convolutional coding Convolution Graph theory signal processing FLOATING POINTS Mathematical Model Kernel

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An image processing approach to approximating interface textures of microcrystalline silicon layers grown on existing aluminum-doped zinc oxide textures

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OPTICS EXPRESS 2013年第22期21卷 A977-A990页

作者： Hertel, Kai Huepkes, Juergen Pflaum, Christoph Univ Erlangen Nurnberg Lehrstuhl Syst Simulat Nurnberg Germany Univ Erlangen Nurnberg Grad Sch Adv Opt Technol Nurnberg Germany Forschungszentrum Julich Photovolta IEK5 Inst Energie & Klimaforsch D-52425 Julich Germany

We present an algorithm for generating a surface approximation of microcrystalline silicon (mu c-Si) layers after plasma enhanced chemical vapor deposition (PECVD) onto surface textured substrates, where data of the textured substrate surface are available as input. We utilize mathematical image processing tools and combine them with an ellipsoid generator approach. The presented algorithm has been tuned for use in thin-film silicon solar cell applications, where textured surfaces are used to improve light trapping. We demonstrate the feasibility of this method by means of optical simulations of generated surface textures, comparing them to simulations of measured atomic force microscopy (AFM) scan data of both Aluminum-doped zinc oxide (AZO, a transparent and conductive material) and mu c-Si layers. (C) 2013 Optical Society of America

关键词： Chemical vapor deposition image processing algorithms Multijunction solar cells Surface plasmon polaritons Surface plasmon resonance Thin film solar cells

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Accuracy test for a corneal topographer based on null-screen method: Preliminary results

Accuracy test for a corneal topographer based on null-screen...

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Latin America Optics and Photonics Conference, LAOP 2014

作者： Estrada-Molina, Amilcar Díaz-Uribe, Rufino Centro de Ciencias Aplicadas y Desarrollo Tecnológico Universidad Nacional Autónoma de México Apto. Postal 70-186 México D.F.C.P 04510 Mexico

The accuracy test of a corneal topographer based on null-screen method is presented. This accuracy test is conducted by testing a calibration sphere. The accuracy found was of 5.8 μm for differences of elevation;75 ... 详细信息

ISBN: (纸本)9781557528254

关键词： Astigmatism Calibration image processing algorithms Optical surfaces Reflection Surfaces Height measurements (120.2830) Optical instruments (120.4640) Ophthalmic optics and devices (330.4460)

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image processing for safety assessment in civil engineering

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APPLIED OPTICS 2013年第18期52卷 4385-4390页

作者： Ferrer, Belen Pomares, Juan C. Irles, Ramon Espinosa, Julian Mas, David Univ Alicante Dept Civil Engn E-03080 Alicante Spain Univ Alicante Univ Inst Phys Appl Sci & Technol E-03080 Alicante Spain

Behavior analysis of construction safety systems is of fundamental importance to avoid accidental injuries. Traditionally, measurements of dynamic actions in civil engineering have been done through accelerometers, but high-speed cameras and image processing techniques can play an important role in this area. Here, we propose using morphological image filtering and Hough transform on high-speed video sequence as tools for dynamic measurements on that field. The presented method is applied to obtain the trajectory and acceleration of a cylindrical ballast falling from a building and trapped by a thread net. Results show that safety recommendations given in construction codes can be potentially dangerous for workers. (C) 2013 Optical Society of America

关键词： Accelerometers High speed photography image processing image processing algorithms Nonlinear spatial filtering Video

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A New FPGA-based Real-Time Configurable System for Medical image processing

A New FPGA-based Real-Time Configurable System for Medical I...

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4th IEEE International Conference on E-Health and Bioengineering (EHB)

作者： Chiuchisan, Iuliana Stefan Cel Mare Univ Suceava Suceava Romania

ISBN: (纸本)9781479923724

Given the importance of digital image processing and the significance of their implementations on hardware to achieve better performance, this paper reviews the advantages of using FPGA over softwares and DSPs as a platform for implementation of digital image processing applications. This work presents a hardware implementation of a FPGA-based real-time configurable system consisting of image processing low-level operators such as, contrast adjustment, brightness adjustment, inverting an image and pseudo-color operation. The paper presents a Verilog description of a real-time configurable system for digital image processing and focuses on medical images enhancement using this system. The solution provides an innovative hardware implementation and simulation, followed by immediate synthesis on FPGA.

关键词： digital image processing Verilog HDL reconfigurable hardware image processing algorithms real-time configurable system for digital image processing

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Design and analysis of wearable pupillometer for autonomic neuropathy of diabetic patients

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APPLIED OPTICS 2014年第29期53卷 H27-H34页

作者： Ko, Mei-Lan Chen, Yin-Yuan Ouyang, Yuan Huang, Ting-Wei Tsuen, Bi-Shiou Jeng, Wei-De Chiou, Jin-Chern Ou-Yang, Mang Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Taiwan Univ Hosp Hsinchu Branch Hsinchu Taiwan Chang Gung Univ Dept Elect Engn Guishan Taoyuan County Taiwan

Diabetes is a familiar disease in modern society. In the early stage of diabetes, symptoms are unobvious, but they usually induce diabetic autonomic neuropathy or, worse, cardiovascular autonomic neuropathy. Pupillometers are effective instruments for observing human pupils. This article presents a novel wearable pupillometer design, without external light artifacts, and an embedded algorithm with blinking elimination, which investigates autonomic neuropathy through recording pupil dynamics triggered by an external sensitive invisible light source. The pupillometer is experimented on 36 healthy subjects and 10 diabetic patients under four different colors (white, red, green, and blue) as well as two different light intensities: 50 and 500 mcd. Ten parameters derived from pupil diameter, pupil response time, and pupil response speed will be evaluated for the healthy subjects and diabetic patients. The results show that three in four parameters related to pupil diameters, one in four related to light intensities, and one in two related to pupil response speed could have significant differences (p < 0.05) between healthy subjects and diabetic patients. These parameters obtain over 85% sensitivity, 83% specificity, and 88% accuracy. The pupillometer is proven reliable, effective, portable, and inexpensive for diagnosing diabetes in an early stage. (C) 2014 Optical Society of America

关键词： Blood image processing image processing algorithms Light intensity Light sources Pupil

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Toward a super imaging system [Invited]

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APPLIED OPTICS 2013年第4期52卷 561-566页

作者： Mendlovic, David Tel Aviv Univ Fac Engn IL-69978 Tel Aviv Israel

This paper deals with the fast-developing area of computational photography where a combination of imaging techniques and efficient image processing algorithms is done to generate a super imaging system. In recent years, three main implementations of the computational photography philosophy were intensively investigated and demonstrated: (i) multiple aperture, (ii) light field photography, and (iii) multiexposure. The paper provides a mini-review of these three approaches and shows ways to improve and combine them toward a super imaging system. As a conclusion, the paper provides preliminary guidelines for fusing the three approaches into one integrated super imaging system with optimized performance. (C) 2013 Optical Society of America

关键词： image processing image processing algorithms image quality Imaging systems Imaging techniques Optical imaging

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Speckle reduction using an artificial neural network algorithm

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APPLIED OPTICS 2013年第21期52卷 5050-5057页

作者： Avanaki, Mohammad R. N. Laissue, P. Philippe Eom, Tae Joong Podoleanu, Adrian G. Hojjatoleslami, Ali Univ Kent Kent Inst Med & Hlth Sci Ctr Res & Dev Canterbury CT2 7PD Kent England Gwangju Inst Sci & Technol Adv Photon Res Inst Kwangju South Korea Univ Kent Sch Phys Sci Appl Opt Grp Canterbury CT2 7NH Kent England

This paper presents an algorithm for reducing speckle noise from optical coherence tomography (OCT) images using an artificial neural network (ANN) algorithm. The noise is modeled using Rayleigh distribution with a noise parameter, sigma, estimated by the ANN. The input to the ANN is a set of intensity and wavelet features computed from the image to be processed, and the output is an estimated sigma value. This is then used along with a numerical method to solve the inverse Rayleigh function to reduce the noise in the image. The algorithm is tested successfully on OCT images of Drosophila larvae. It is demonstrated that the signal-to-noise ratio and the contrast-to-noise ratio of the processed images are increased by the application of the ANN algorithm in comparison with the respective values of the original images. (C) 2013 Optical Society of America

关键词： Anisotropic diffusion image metrics image processing image processing algorithms Speckle noise Speckle reduction

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Direct period measurement for fiber Bragg grating using an optical imaging technique

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APPLIED OPTICS 2013年第22期52卷 5393-5397页

作者： Ali, M. M. Lim, K. S. Yang, H. Z. Chong, W. Y. Lim, W. S. Ahmad, H. Univ Malaya Fac Sci Dept Phys Photon Res Ctr Kuala Lumpur 50603 Malaysia NW Univ Xian Dept Phys Xian 710069 Shaanxi Peoples R China

This paper proposes an approach based on an optical imaging technique for the period measurement of fiber Bragg gratings (FBG). The simple, direct technique involves a differential interface contrast (DIC) microscope and a high-resolution CCD camera. image processing is performed on the microscope images to obtain low-noise grating profiles and then the grating periods. Adopting a large image sample size in the image processing can reduce uncertainty. During the investigation, FBGs of different grating periods are fabricated by prestraining the photosensitive fibers during the UV-writing process. A good linearity between the measured Bragg wavelengths and grating periods is observed and the measured strain-optics coefficient was found to be in agreement with reported literature. (C) 2013 Optical Society of America

关键词： Digital image processing Effective refractive index image processing image processing algorithms Optical imaging Refractive index

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Single-step method for fiber-optic probe-based full-range spectral domain optical coherence tomography

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APPLIED OPTICS 2013年第21期52卷 5143-5151页

作者： Min, Eun Jung Shin, Jun Geun Lee, Jae Hwi Yasuno, Yoshiaki Lee, Byeong Ha Gwangju Inst Sci & Technol Sch Informat & Commun Kwangju 500712 South Korea Univ Tsukuba Inst Appl Phys Tsukuba Ibaraki 3058573 Japan

We propose a single-step method appropriated for a fiber-optic probe-based full-range spectral domain optical coherence tomography (OCT). The fiber-optic probe was scanned over a sample with a magnetically driven actuator. In the reference arm, a phase shift of pi/2 was applied during two neighbor axial scanning, from which the complex spectral interferogram was directly reconstructed. Since the complex-conjugate-free OCT image is obtained by doing just one Fourier transform on the complex interferogram, obtaining the full-range image is simple in algorithm and effective in computation time. Some full-range images of biological samples created with the proposed method are presented and the processing time is analyzed. (C) 2013 Optical Society of America

关键词： Fourier transforms image processing image processing algorithms Phase modulation Phase shift Spectral domain optical coherence tomography

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