IMEKO Event Proceedings

Page 854 of 866 Results 8531 - 8540 of 8655

W. Winiecki, P. Bobinski, R. Lukaszewski
VISA DRIVERS IN DISTRIBUTED MEASUREMENT SYSTEMS

Application of software drivers, based on VISA architecture, in Java application and applets is considered. Next, an example of the system, that uses a communication based on sockets for remote controlling HP859x Spectrum Analyser, also via Internet, is presented.

Xi Zhang, Laiwei Li, Junyi Yang
VISION BASED 3D MEASUREMENT AND GUIDING SYSTEM FOR REMOTELY OPERATED UNDERWATER VEHICLE

Remotely operated underwater vehicles (ROV) equipped with manipulator have been used for underwater operation increasingly. The ROV is usually operated manually with the aid of underwater camera to approach and grasp a target by its manipulator. Due to the low quality of underwater imaging, it is quite difficult for the human operator to determine the accurate distance and orientation between the ROV and the target interested. This paper presents an idea of developing an automatic 3D measurement and guiding system for ROV in an effort to facilitate this process. Based on structure-light triangulation principle, dual laser line and a camera are utilized to calculate the position and orientation of a cylindrical target. The measurement model considering refraction compensation and system calibration method is proposed. A prototype measurement system is designed and tested in a simulated underwater environment by a glass water tank. The experiments showthat the proposed system is feasible to determine the position and orientation of the target automatically on an accurate and efficient manner.

C.Donciu, O.Costea
VISION BASED INTELLIGENT SEMAPHORING SYSTEM

The present paper suggest making an intelligent video system of command over crossroads with traffic lights, its main goal being to diminish of traffic congestions, to improve vehicle speed, to reduce environment pollution and to improve negative effects of traffic congestion over the physic and psychic state of the population. The architecture of the suggested system is made on a hardware level from three different areas: the video sensor’s level, the computer process level and the represented execution level and the traffic-lights that exist in the crossroad. The software architecture of this system is made out of the main routine and a number of secondary routines of image processing and of the Fuzzy command. The existing systems are useful only in low traffic crossroads, being able to interpret informations only from the near proximity of the sensors, but unable to estimate the number of vehicles waiting in line on a traffic lane.

N. Arunachalam, B. Ramamoorthy
VISION BASED SURFACE ROUGHNESS EVALUATION OF GROUND COMPONENTS USING WAVELET TRANSFORM AND NEURAL NETWORK

This paper describes a non-contact technique to assess the differences in surface characteristics of the ground components. The computer vision based system is used to analyze the pattern of scattered light from the surface to asses the surface roughness of the component. The ground specimens were manufactured using varying machining parameters. The images of the specimens are captured using a CCD camera. The image parameters based on the wavelet transform are evaluated. Then, the evaluated parameters along with the cutting parameters were used to train the artificial neural network to predict the surface roughness parameters Ra, which is measured using the stylus instrument. The comparison of stylus Ra and that predicted using ANN are presented and analyzed in this paper.

Alfredo Accattatis, Marcello Salmeri, Arianna Mencattini, Giulia Rabottino, Roberto Lojacono
VISUAL ANALYSER: A SOPHISTICATED VIRTUAL MEASUREMENTS LABORATORY FOR STUDENTS

The paper presents Visual Analyser, a free software tool developed by the research unit and suggested for use as a sophisticated virtual measurements educational laboratory for students. It can use either the sound card provided with all PC’s or dedicated hardware as the interface with the external world, and exploits the power of modern PC’s to achieve great performance. Visual Analyser includes a large set of instruments including a spectrum analyzer, a waveform generator, an oscilloscope and many other signal processing tools. For its special features Visual Analyser has been adopted by many professional and academic laboratories over the world.

As. Ing. C. Dughir
VISUAL C++ COMPLEX MATHEMATICAL SIGNAL GENERATOR

This paper present a complex mathematical signals generator that can generate a combination of mathematical signals at the output of a PC sound card. The user can describe complex mathematical functions to be generated. The signal generator proposed is very simple to use and don’t require complex and expensive hardware to run.

Sumitoshi Ogata, Takahiro Kawakami, Kenta Kirimoto
Visual Demonstration of Tidal Movement with Clear Cycles by Time Frequency Analysis

The present study deals with tidal movement in a Japanese coastal area where the half day and one day tidal periods are generally observed. We aim to make the dynamics of this tidal movement much clearer from a point of view of time frequency analysis using a short time Fourier transform(STFT) and a wavelet transform(WT) in addition to a conventional fast Fourier transform(FFT). These three approaches are complementary each other and available for the comprehensive understandings of complicated, oceanic phenomena. The STFT analysis reveals that the four tidal periods are observed only when the tidal power becomes relatively weak around every low tide. On the other hand, two of four periods become indiscriminating around every high tide due to a masking effect of the major, strong tidal powers. We also demonstrate that the WT analysis is exclusively available for visualizing the phase shift process of these two major tidal periods.

Se Jin Park, Murali Subramaniyam, Moon Kug Moon, Dong Gyun Kim
VISUAL FATIGUE ASSESSMENT OF WATCHING 3D TELEVISION BY ELECTROENCEPHALOGRAM AND SUBJECTIVE EVALUATION

Watching 3D on TV bombards the eyes and brain with a succession of flashing images that appear for a fraction of a second. This technology puts potential health risks such as visual fatigue, motion sickness, lingering depth perception problems, disorientation and decreased postural stability, especially children and teenagers may be more susceptible to health issues associated with viewing in 3D. This study performed the visual fatigue assessment of watching 3D on TV in teenagers (age: 18.81 ± 0.53 years) by electroencephalogram (EEG) for brain waves and subjective evaluation. A total of 27 subjects including male and female were considered. The Biopac system’s Acqknowledge program was used as a physiological workstation. The significant (p < 0.05) increase in the beta frequency was observed after watching 3D visuals. This result supported by the subjective evaluation; which shows that the amount of 3D visual fatigue was greater than that of 2D.

J. Sakiyama, M. Okamoto, H. Yamamoto
VISUAL FEEDBACK SYSTEM FOR NEUROANATOMY

In this paper, we propose a visual feedback system for a neuroanatomy. The stereoscopic microscope image of the dentate gyrus of adult rat brain in the neuroanatomy is converted into a black and white image. By the region segmentation, the region of the dentate gyrus is extracted. A binary image is obtained from a microscopic photo of cresyl violet-stained coronal section of the rat brain as a template. By the template matching, the apex of the dentate gyrus is automatically detected. The visual feedback system consists of a stereoscopic microscope, a micromanipulator, two CCD cameras and a personal computer. According to the stereo vision method, the distance between the dentate gyrus and the tip of microelectrode is three dimensionally measured based on the position difference between the left and the right image. Following an insertion of the tip of microelectrode to the dentate gyrus, the lypophilic fluorescent tracer is slowly injected by a nanoinjector. As a result, the glass microelectrode can be guided to pierces the apex of the dentate gyrus in desired depth.

Alberto Ortiz, Francisco Bonnin-Pascual, Emilio Garcia-Fidalgo, Joan Pep Company-Corcoles, Kai Yao
Visual Inspection of Vessels Cargo Holds: Use of a Micro-Aerial Vehicle as a Smart Assistant

This paper describes a Micro-Aerial Vehicle (MAV) intended for the visual inspection of cargo holds, whose development, among others, takes place within the context of the EU-funded H2020 project ROBINS, with the purpose of making ship inspections safer and more cost-efficient. To this end, the vehicle is equipped with specific sensors that are to permit teleporting the surveyor to the areas that need inspection, while the focus of the control software is on providing enhanced functionality and autonomy for the inspection processes. All this has been accomplished in the context of the supervised autonomy paradigm, by means of the definition of different autonomy levels and functionalities (including obstacle detection and collision prevention), and extensive use of behaviour-based high-level control, all intended for visual inspection as already mentioned. Automatic detection of defects is also addressed as part of ROBINS goals, through the adoption of deep learning approaches for enhanced performance. Results for some experiments conducted to assess the different functionalities are reported at the corresponding sections of the paper.

Page 854 of 866 Results 8531 - 8540 of 8655