• 제목/요약/키워드: Measurement Algorithm

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클러터가 존재하는 환경에서의 HPDA를 이용한 다중 표적 자동 탐지 및 추적 알고리듬 연구 (A Study of Automatic Multi-Target Detection and Tracking Algorithm using Highest Probability Data Association in a Cluttered Environment)

  • 김다솔;송택렬
    • 전기학회논문지
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    • 제56권10호
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    • pp.1826-1835
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    • 2007
  • In this paper, we present a new approach for automatic detection and tracking for multiple targets. We combine a highest probability data association(HPDA) algorithm for target detection with a particle filter for multiple target tracking. The proposed approach evaluates the probabilities of one-to-one assignments of measurement-to-track and the measurement with the highest probability is selected to be target- originated, and the measurement is used for probabilistic weight update of particle filtering. The performance of the proposed algorithm for target tracking in clutter is compared with the existing clustering algorithm and the sequential monte carlo method for probability hypothesis density(SMC PHD) algorithm for multi-target detection and tracking. Computer simulation studies demonstrate that the HPDA algorithm is robust in performing automatic detection and tracking for multiple targets even though the environment is hostile in terms of high clutter density and low target detection probability.

CDMA2000 1x 역방향 링크의 신호 품질 측정 알고리즘 (A Signal Quality Measurement Algorithm for CDMA2000 1x Reverse-link)

  • 강성진
    • 한국항행학회논문지
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    • 제16권6호
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    • pp.997-1004
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    • 2012
  • 본 논문에서는 CDMA2000 1x 단말기 신호의 품질 측정을 위한 알고리즘을 제안하고 구현하였다. 제안된 알고리즘은 PC 기반 플랫폼에서 소프트웨어로 구현이 가능하도록 하였으며, 4배 오버샘플링된 입력 신호에 대하여 등화, PN 부호 동기 및 추적, 주파수 및 위상 오프셋 보상을 수행하여 수신 신호가 추출되고, 추출된 신호로부터 역확산, 복조를 통해 측정에 사용될 기준 신호를 재생성한다. 이 재생성된 신호와 추출된 신호를 이용하여 단말기의 신호 품질을 측정한다.

DUMMY 모선을 고려한 상태추정 측정점선정 알고리즘에 관한 연구 (A Study on Measurement Selection Algorithm for Power System State Estimation under the consideration of Dummy Buses)

  • 이태식;문영현;함완균;권태원
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1991년도 하계학술대회 논문집
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    • pp.406-410
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    • 1991
  • This paper presents an improved algorithm of optimal measurement system design with a reliability evaluation method for large power system. The proposed algorithm is developed to consider the dummy bus and to achieve highest accuracy of the state estimator as well with the limited Investment cost. The dummy bus in the power system is impossible to install measurement meter, while real and reactive power measurement values are exactly zero. Thus, the effect on these dummy bus measurements is considered in the proposed algorithm. On the other hand, P/C model is developed by taking advantage of the matrix sparsity. The improved program is successfully tested for KEPCO system with PSS/E lineflow calculated data package.

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위치(位置) 측정장치(測定裝置)를 이용한 트랙터의 자동(自動) 주행장치(走行裝置) (Automatic Guidance System for Tractor based upon Position-measurement Systems)

  • 최창현
    • Journal of Biosystems Engineering
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    • 제15권2호
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    • pp.79-87
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    • 1990
  • An automatic guidance system based upon two position-measurement systems was designed to record where the tractor traveled and to guide the tractor along the predetermined path. An algorithm, using the kinematic behavior of tractor movement, was developed to determine the steering angle to reduce lateral position error. The algorithm was based upon constant travel speed, constant steering rate, and zero slip angles of the tractor wheels. The algorithm was evaluated through use of computer simulation and verified in field experiments. Results showed that the distance interval between position measurements was an important factor in guidance system performance. The position-measurement error of the guidance system must be less than 5 cm to be acceptably precise for field operations. An algorithm based upon a variable steering rate might improve the stability of the guidance system. More accurate measurement of tractor position and yaw angle, and faster error processing are required to improve the field performance of the guidance system.

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DUMMY모선을 고려한 상태추정 측정점선정 알고리즘에 관한 연구 (A Study on Measurement Selection Algorithm for Power System State Estimation Under the Consideration of Dummy Buses)

  • 문영현;이태식
    • 대한전기학회논문지
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    • 제41권2호
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    • pp.107-117
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    • 1992
  • This paper presents an improved algorithm of optimal measurement design with a reliability evaluation method for a large power system. The proposed algorithm is developed to consider the dummy bus and to achieve highest accuracy of the state estimator as well with the limited investment cost. The dummy bus in the power system is impossible to install measurement meter, while real and reactive power measurements is considered in the proposed algorithm. On the other hand, P/C model is developed by taking advantage of the matrix sparsity. The improved program is successfully tested for KEPCO system with PSS/E lineflow calculated data package.

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다중 렌즈 모듈의 기울기 측정 : 이론 및 응용 (Tilt Measurement of Lens Module with Multiple Lenses : Algorithm and Application)

  • 이승희;박종현
    • 대한기계학회논문집A
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    • 제31권3호
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    • pp.395-402
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    • 2007
  • This paper considers about the tilt measurement of lens module with multiple lenses. The tilt between lenses in lens module and barrel or between image sensor and barrel can be measured precisely with the proposed algorithm. The magnitude and direction of the tilt vector of lens and image sensor can be measured from the best focal surface. The selecting and setting of image sensor, test chart, image sensor centering to lens module, axis align, focus measure method are also explained to get highly precise tilt results. The proposed algorithm is verified with the lens module inspection system we developed, and the experimental results show that the tilt measure proposed in this paper is robust and precise. With the proposed tilt measurement algorithm, the tilt of an image sensor and any other lens which intermediates light can be measured.

Triqubit-State Measurement-Based Image Edge Detection Algorithm

  • Wang, Zhonghua;Huang, Faliang
    • Journal of Information Processing Systems
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    • 제14권6호
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    • pp.1331-1346
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    • 2018
  • Aiming at the problem that the gradient-based edge detection operators are sensitive to the noise, causing the pseudo edges, a triqubit-state measurement-based edge detection algorithm is presented in this paper. Combing the image local and global structure information, the triqubit superposition states are used to represent the pixel features, so as to locate the image edge. Our algorithm consists of three steps. Firstly, the improved partial differential method is used to smooth the defect image. Secondly, the triqubit-state is characterized by three elements of the pixel saliency, edge statistical characteristics and gray scale contrast to achieve the defect image from the gray space to the quantum space mapping. Thirdly, the edge image is outputted according to the quantum measurement, local gradient maximization and neighborhood chain code searching. Compared with other methods, the simulation experiments indicate that our algorithm has less pseudo edges and higher edge detection accuracy.

마이크로 ESPI 기법에 의한 면내 변형 측정 민감도 향상 (Improvement of Sensitivity to In-plane Strain/Deformation Measurement by Micro-ESPI Technique)

  • 김동일;허용학;기창두
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.1442-1445
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    • 2005
  • Several test methods, including micro strain/deformation measurement techniques, have been studied to more reliably measure the micro properties in micro/nano materials. Therefore, in this study, the continuous measurement of in-plane tensile strain in micro-sized specimens of thin film materials was introduced using the micro-ESPI technique. TiN and Au thin films 1 and $0.47\;\mu{m}$ thick, respectively, were deposited on the silicon wafer and fabricated into the micro-sized tensile specimens using the electromachining process. The micro-tensile loading system and micro-ESPI system were developed to measure the tensile strain during micro-tensile test. The micro-tensile stress-strain for these materials was determined using the algorithm for continuous strain measurement. Furthermore, algorithm for enhancing the sensitivity to measurement of in-plane tensile strain was suggested. According to the algorithm for enhancement of sensitivity, micro-tensile strain data between interfringe were calculated. It is shown that the algorithm for enhancement of the sensitivity suggested in this study makes the sensitivity to the in-plane tensile strain increase.

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이미지 프로세싱을 활용한 공구의 마모 측정법 연구 (A Study of Tool Wear Measurement Using Image Processing)

  • 김수민;정민수;박종규
    • 로봇학회논문지
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    • 제19권1호
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    • pp.65-70
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    • 2024
  • Tool wear is considered an important issue in manufacturing and engineering, as worn tools can negatively impact productivity and product quality. Given that the wear status of tools plays a decisive role in the production process, measuring tool wear is a key task. Consequently, there is significant attention in manufacturing fields on the precise measurement of tool wear. Current domestic methods for measuring wear are limited in terms of speed and efficiency, with traditional methods being time-consuming and reliant on subjective evaluation. To address these issues, we developed a measurement module implementing the DeepContour algorithm, which uses image processing technology for rapid measurement and evaluation of tool wear. This algorithm accurately extracts the tool's outline, assesses its condition, determines the degree of wear, and proves more efficient than existing, subjective, and time-consuming methods. The main objective of this paper is to design and apply in practice an algorithm and measurement module that can measure and evaluate tool wear using image processing technology. It focuses on determining the degree of wear by extracting the tool's outline, assessing its condition, and presenting the measured value to the operator.

이미지 상관법의 서브 픽셀 알고리즘을 이용한 측정 분해능 향상에 관한 연구 (Study on Improvement of Measurement Precision in Digital Image Correlation Measurement Method by Using Subpixel Algorithms)

  • 김성종;강영준;최인영;홍경민;유원재
    • 한국정밀공학회지
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    • 제32권12호
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    • pp.1039-1047
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    • 2015
  • Contact type sensors (e.g., displacement sensor and strain gauge) were typically used to evaluate the safety and mechanical properties in machines and construction. However, those contact type sensors have been constrained because of measurement problems such as surface roughness, temperature, humidity, and shape. The Digital Image Correlation (DIC) measurement system is a vision measurement system. This measurement system uses the taken image using a CCD camera and calculates the image correlation between the reference image and the deformed image under external force to measure the displacement and strain rates. In this paper, we discuss methods to improve the measurement precision of the digital image correlation measurement system. A tensile test was conducted to compare the precision improvement effects, by using the universal test machine and the DIC measurement system, with the use of subpixel algorithms, i.e., the Coarse Fine Search (CFS) algorithm and the Peak Finding (PF) algorithm.