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1st International Cognitive Cities Conference (IC3)

作者： Su, Chuan-Tsung Shan, Yi-Chia Fang, Wei Lin, Chii-Wann Juan, Ju-Hsuan Lu, Kuan-Ting Wu, Jih-Huah Natl Taiwan Univ Inst Biomed Engn Taipei Taiwan Natl Taiwan Univ Dept Bioind Mechatron Engn Taipei Taiwan Ming Chuan Univ Dept Biomed Engn Taoyuan Taiwan

ISBN: (纸本)9781538650592

A novel development platform of the specific microcirculation analysis was proposed in this study. This study was to observe the effect of the blood microcirculation with LED stimulation. The experiment involved the light emitting diode array (LEDA), the designed control board and the image processing algorithm on the platform. LEDA (six LEDs, wavelength 660 mu, operating frequency 8 - 15 Hz) was used to stimulate the palm of the subject, and then, the microcirculation images were analyzed by the image processing algorithm. The blood velocity on the ring finger was increased after LEDA stimulation, and it was approximately 1.7 times compared with and without the light stimulation. Thus, LEDA stimulation on the palm enhanced the microcirculation. Also, a specific platform of LEDA system with microcirculation measurement was developed in this study.

关键词： microcirculation light emitting diode array image processing algorithm

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Interactive image Retrieval System Based on Multiple Features 20

Interactive Image Retrieval System Based on Multiple Feature...

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20th IEEE International Conference on Computer Supported Cooperative Work in Design (CSCWD)

作者： Xie, Yichen Nanchang Univ Nanchang Peoples R China

ISBN: (纸本)9781509019151

The most commonly image retrieval method is based on the text at present. The big workload is one of the disadvantages of this approach, it also needs to add tags artificiality, which has a strong subjectivity. More and more people developed themselves into the research of content-based image retrieval technology, and so far there is not a universal retrieval method for any image. In this paper, a interactive retrieval method is realized, and the thought of the optimizing the feedback results by the human-computer interaction is put forward. Some methods for eigenvalue extraction such as the edge detection, the extraction of gray histogram and brightness histogram are studied. These algorithms are also used in the image retrieval system. Experimental results on the STANFORD VERSION LAB 101 Object Categories image library, show the efficiency of the proposed methods. The structure of the paper is as follows: chapter one is the introduction, chapter two is about the five feature extraction algorithms used in the system, chapter three is the idea of eigenvalue storage, chapter four is the experiment on this system, and chapter five is the conclusion.

关键词： Human-computer interaction image Retrieval image processing algorithm

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GPU Accelerated 2D and 3D image processing

GPU Accelerated 2D and 3D Image Processing

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Federated Conference on Computer Science and Information Systems (FedCSIS)

作者： Morar, Anca Moldoveanu, Florica Moldoveanu, Alin Balan, Oana Asavei, Victor Univ Politehn Bucuresti Bucharest Romania

ISBN: (纸本)9788394625375

The current advances in hardware led to the development of the GPGPU (General-purpose computing on graphics processing units) paradigm. Thus, nowadays, the GPU (Graphics processing Unit) is used not only for graphics programming, but also for general purpose algorithms. This paper discusses several methods regarding the use of CUDA (Compute Unified Device Architecture) for 2D and 3D image processing techniques. Some general rules for writing parallel algorithms in computer vision are pointed out. A theoretic comparison between the complexity for CPU (Central processing Unit) and GPU implementations of image processing algorithms is given. Also, real computing times are provided for several algorithms in order to point out the actual performance gain of using the GPU over CPU. The factors that contribute to the difference between theoretic and real performance gain are also discussed.

关键词： GPGPU CUDA CPU central processing units Graphics processing Unit GRAPPER PICK UP Three-Dimensional images images computer vision image processing algorithm

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Analysis of the detachment of citrus fruits by vibration using artificial vision

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BIOSYSTEMS ENGINEERING 2014年第0期119卷 1-12页

作者： Torregrosa, A. Albert, F. Aleixos, N. Ortiz, C. Blasco, J. Univ Politecn Valencia Dpto Ingn Rural & Agroalimentaria Valencia 46022 Spain Univ Politecn Valencia Inst Interuniv Invest Bioingn & Technol Orientada Valencia 46022 Spain Inst Valenciano Invest Agr Ctr Agroingn Valencia 46113 Spain

The vibratory behaviour of citrus fruits is studied using slow-motion cameras in order to gain a better understanding of the parameters involved in fruit detachment when mechanical harvesting is done using shakers. Single citrus fruits with a small portion of stem were vibrated using strokes from 60 mm to 180 mm and frequencies from 3 Hz to 18 Hz. The movement was recorded at 300 fps and the main parameters considered for fruit detachment were determined through the analysis of the video sequences. image-processing algorithms created for this purpose were applied to the automated estimation of the centroid of the fruit, the angle of the stem pistil axis, and the position of some selected points in the fruit in each frame of the video sequences to obtain dynamic parameters such as the position, speed and acceleration of the fruit during the movement until it is detached. The signals obtained from the image processing were filtered, providing results in accordance with the calibration systems. In general, results suggest that the inertial forces transmitted to the fruit were lower than the tensile forces required to detach the fruit by pulling it in the stem pistil direction. The largest peaks were observed using long strokes that required fewer cycles for detachment. On the other hand, short strokes combined with high frequencies needed more cycles, and thus a fatigue phenomenon was present. Short strokes and low frequencies were unable to detach some fruit. (C) 2014 IAgrE. Published by Elsevier Ltd. All rights reserved.

关键词： image processing algorithm Video sequences Berries robot vision calibration system dynamic parameter citrus fruit Fruit Prosthesis image processing Inertial forces

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A vision-based system for post-welding quality measurement and defect detection

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2016年第9-12期86卷 3007-3014页

作者： Chu, Hui-Hui Wang, Zong-Yi Harbin Engn Univ Coll Automat 145 Nantong Rd Harbin 150001 Heilongjiang Peoples R China

The measurement of the welding bead and the followed evaluation of the weld quality is an important part in the industrial welding. However, the main difficulty in using visual inspection to evaluate the weld quality is the time taken and labor wasted. In order to solve these problems, an automated vision-based system is presented for non-destructive and online post-welding quality inspection. The trouble with respect to vision-based system is the robustness of image processing algorithms. This paper presents a novel image processing method that can automatically extract the weld joint profile and feature points, measure the weld bead size, and detect defects. At the same time, the three-dimensional (3D) profile of the weld surface can be reconstructed with the aim of monitoring the weld quality online. The proposed algorithm is validated through experiment in industrial environment.

关键词： Machine vision image processing algorithm Weld quality inspection 3D reconstruction

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Experimental studies on the terminal velocity of air bubbles in water and glycerol aqueous solution

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EXPERIMENTAL THERMAL AND FLUID SCIENCE 2016年 78卷 254-265页

作者： Liu, Liu Yan, Hongjie Zhao, Guojian Zhuang, Jiacai Cent S Univ Sch Energy Sci & Engn Changsha 410083 Peoples R China

Terminal rising velocity of a single bubble in stagnant water and glycerol aqueous solution was studied by the techniques of high-speed photography and digital image analysis. The results can be summarized as follows: In water, bubble terminal velocity increases while aspect ratio decreases almost linearly in the region where d < 0.83 mm. Then, both terminal velocity and aspect ratio begin to show a widely scattered trend with the bubble diameter in the range 0.83-6 mm. Finally, the level of scattering tends to be weak and the terminal velocity increases gradually while the aspect ratio remains relatively stable when d > 6 mm. In the surface-tension-dominated regime, the aspect ratio of a single bubble varies significantly with the value fluctuating from 0.4 to 0.99. The aspect ratio should be taken into account with the bubble diameter when predicting the terminal velocity. In the inertia-dominated regime, the terminal velocity increases gradually with increasing the bubble diameter while their aspect ratios vary between 0.4 and 0.7. In the glycerin aqueous solution, as a whole, the terminal velocity increases with bubble diameter and the trend of the bubble velocity does not show a scattered behavior. In water, the most accurate model for predicting terminal velocity throughout the investigated range is given by Tomiyama et al. (2002), and then followed by Ishii and Chawla (1979). (C) 2016 Elsevier Inc. All rights reserved.

关键词： Bubble dynamics Bubble terminal velocity image processing algorithm Aspect ratio Drag coefficient Empirical correlations

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image processing of weld pool and keyhole in Nd:YAG laser welding of stainless steel based on visual sensing

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Transactions of Nonferrous Metals Society of China 2011年第2期21卷 423-428页

作者：高进强秦国梁杨家林何建国张涛武传松山东大学材料液固结构演变与加工教育部重点实验室济南250061 中国工程物理研究院机械制造工艺研究所绵阳621900

In order to obtain good welding quality, it is necessary to apply quality control because there are many influencing factors in laser welding process. The key to realize welding quality control is to obtain the quality information. Abundant weld quality information is contained in weld pool and keyhole. Aiming at Nd：YAG laser welding of stainless steel, a coaxial visual sensing system was constructed. The images of weld pool and keyhole were obtained. Based on the gray character of weld pool and keyhole in images, an image processing algorithm was designed. The search start point and search criteria of weld pool and keyhole edge were determined respectively.

关键词： laser welding keyhole weld pool edge image processing algorithm

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Architecture and applications of the HiPAR video signal processor

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 1996年第1期6卷 56-66页

作者： Ronner, K Kneip, J Laboratorium fÜr Informationstechnologie Universität Hannover Hanover Germany

In this paper, we propose the architecture of a highly parallel DSP (HiPAR-DSP) as a flexible and programmable processor for image and video processing. The design of this processor is based on an analysis of characteristic properties of image processing algorithms in terms of available parallelization resources, demands on program control, and required data access mechanisms. This led to a very long instruction word (VLIW)-controlled ASIMD RISC-architecture with four or sixteen data paths, employing data-level parallelism, parallel instructions, micro-instruction pipelining, and data transfer concurrently to data processing. Common data access patterns for image processing algorithms are supported by use of a shared on-chip memory with parallel matrix type access patterns and a separate data-cache per data path, By properly balancing processing and controlling capabilities as internal and external memory bandwidth, this approach is optimized to make best use of currently available silicon resources. A high clock frequency is achieved by implementation of classic RISC features. The architecture fully supports high level language programming. With the 16 data path version at 100 MHz clock, a sustained performance of more than 2 billion arithmetic operations per second (GOPS) is achieved for a wide range of algorithms. Given examples show the parallel implementation of image processing algorithms like histogramming, Hough transform, or search in a sorted list with efficient use of the processor resources. A prototype of the architecture with four parallel data paths will be available in the second quarter of 1996, using a 0.6 mu m CMOS technology.

关键词： image processing algorithm information retrieval ranging algorithm ARCHITECTURE Building construction Access to Information external memory Hough transform Very long instruction word Parallel Lines Program control channels (data transmission) clock frequency

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Grating projection system for surface contour measurement

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APPLIED OPTICS 2005年第8期44卷 1393-1400页

作者： Tay, CJ Thakur, M Quan, CG Natl Univ Singapore Dept Mech Engn Singapore 119260 Singapore

A grating projection system is a low-cost surface contour measurement technique that can be applied to a wide range of applications. There has been a resurgence of interest in the technique in recent years because of developments in computer hardware and image processing algorithms. We describe a method that projects a phase-shifted grating through a lens on an object surface. The deformed grating image on the object surface is captured by a CCD camera for subsequent analysis. Phase variation is achieved by a linear translation stage on which the grating is mounted. We compare the experimental results with the test results using a mechanical stylus method. (c) 2005 Optical Society of America.

关键词： Contour measurement Computer hardware Projection systems Charge Coupled Device camera resurgence image processing algorithm Clinical Test Result

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A Study on Welding Quality Inspection System for Shell-Tube Heat Exchanger Based on Machine Vision

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INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 2017年第6期18卷 825-834页

作者： Chu, Hui-Hui Wang, Zong-Yi Harbin Engn Univ Coll Automat 145 Nantong Rd Harbin 150001 Peoples R China

An automated based-vision quality inspection system for Shell-Tube welding is presented in this paper in order to achieve nondestructive weld defect detection. The vision sensor is developed on the basis of the principle of laser triangulation. First, the composition and working principle of the vision-based quality inspection system are introduced, and meanwhile various defects may occur are described in detail. Then the image processing algorithm, as the most important part of online quality inspection system, is also represented. The image processing algorithm includes two parts: preprocessing and defect detection. In defect detection section, a novel method for determining and describing the position of undercut, which is based on the parameter equation of the circle to represent the position of the undercut, is presented. Last, two experiments are carried out for Shell-Tube heat exchanger and the experiments show that the image algorithm has high precision, strong robustness and can detect the defect accurately.

关键词： Welding quality inspection Defect detection image processing algorithm Shell-tube heat exchanger

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