• Title/Summary/Keyword: 상대 좌표

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A Study of Relative Location Estimation between Static Passive RFID Tag and Mobile Robot (정적 RFID 수동태그와 이동로봇의 상대위치인식에 대한 기법연구)

  • Moon W.S.;Ji Y.K.;Park J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.892-896
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    • 2005
  • This paper presents method of depriving the relationship between static passive RFID tag and mobile robot In the field of tag-range. We use probabilistic sensor model of RFID reader by experiments. And we proposed estimation techniques by using direction of identification and relative-distance from the sensor model. Corresponding to distribution of identification, we can correct estimated tag position in relative coordinate. Simulation and Experimental Results show that the proposed method can provide good performance and thus be used fer mobile-robot localization.

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A Study on the Dynamic Analysis of Multibody System by the Relative Joint Coordinate Method (상대이음좌표방법을 이용한 다물체 시스템의 동역학적 해석에 관한 연구)

  • 이동찬;배대성;한창수
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.8
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    • pp.1974-1984
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    • 1994
  • This paper presents a relative coordinate formulation for constrained mechanical systems. Relative coordinates are defined along degrees of freedom of a joint. Graph theoretic analyses are performed to identify topological paths in mechanical systems. Cut constraints are generated to handle closed loop systems. Equations of motion are derived in the Cartesian space and transformed to the joint space. Relative generalized coordinates are corrected to satisfy the cut constraints by a parametrizatiom method.

Dynamic analysis of a launcher under impulsive forces (충격력을 받는 발사대의 동역학적 해석)

  • 이병훈;유완석;김준호
    • Journal of the korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.84-91
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    • 1993
  • The dynamic behaviors of a launcher under impulsive forces are analyzed. All the components of the system, ie ; chassis, turret, cage and suspension parts, are modeled as rigid. The dynamic analysis code, which is developed with the formulae describing the system equations of motion in terms of relative quantities, is used to carry out the analysis. The results show the dynamic responses of chassis and cage when the driving constraints are imposed on turret and cage.

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A Simple Camera Calibration using a Planar Patern Image (평면 패턴 영상을 이용한 단순 카메라 캘리브레이션)

  • Kim, Dong-Geun;Kim, Jin-Yong
    • Proceedings of the Korea Information Processing Society Conference
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    • 2001.10a
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    • pp.773-776
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    • 2001
  • 본 논문에서는 캘리브레이션 패턴을 카메라와 평행한 평면에 위치시켜 카메라의 회전 요소를 없게 하여 회전 행렬이 단위 행렬이 되게 한 상태에서 카메라를 캘리브레이션 하였다. 카메라의 투영중심에 대한 투영면과 프레임 버퍼에서의 영상 중심 위치($C_x,\;C_y$), 촛점거리(f) 등의 내부 파라메타와 세계 좌표의 원점에 대한 카메라의 상대 위치($T_x,\;T_y,\;T_z$)를 서로 다른 거리에서 획득한 두 장의 패턴 영상을 이용하여 효과적으로 계산하였다.

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Facial expression recognition using eigen-points (아이겐포인트를 이용한 표정 인식)

  • 홍성희;변혜란
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.04b
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    • pp.817-819
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    • 2004
  • 본 논문에서는 사람의 얼굴표정을 구분하기 위해서 무표정 영상으로부터 18개의 특징점을 찾고, 그 특징점 간의 거리를 템플릿으로 이용하는 방법을 연구하였다. 얼굴표정인식을 위해 정의된 기본 템플릿과 입력 표정 영상에서의 특징정 간의 상대적인 거리의 차이와 특징점의 좌표변위 차이를 이용하여 표정을 구분하도록 하였다. 각 테스트 표정영상의 특징점은 주요 얼굴요소로부터 아이겐포인트(eigen-point)를 자동으로 추출하였다. 표정 인식은 신경망 학습을 통해서 기쁨, 경멸, 놀람, 공포 슬픔 등 5가지로 나누어 실험하였고, 신경망의 인식 결과와 사람의 인식 결과를 통해서 비교한 결과, 72%의 인식성능을 보여주었다.

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Three-dimensional analysis of soft and hard tissue changes after mandibular setback surgery in skeletal Class III patients (골격성 3급 부정교합 환자의 하악골 후퇴술 시행후 안모변화에 대한 3차원적 연구)

  • Park, Jae-Woo;Kim, Nam-Kug;Kim, Myung-Jin;Chang, Young-Il
    • The korean journal of orthodontics
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    • v.35 no.4 s.111
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    • pp.320-329
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    • 2005
  • The three-dimensional (3D) changes of bone, soft tissue and the ratio of soft tissue to bony movement was investigated in 8 skeletal Class III patients treated by mandibular setback surgery. CT scans of each patient at pre- and post-operative states were taken. Each scan was segmented by a threshold value and registered to a universal three-dimensional coordinate system, consisting of an FH plane, a mid-sagittal plane, and a coronal plane defined by PNS. In the study, the grid parallel to the coronal plane was proposed for the comparison of the changes. The bone or soft tissue was intersected by the projected line from each point on the gird. The coordinate values of intersected point were measured and compared between the pre- and post-operative models. The facial surface changes after setback surgery occurred not only in the mandible, but also in the mouth corner region. The soft tissue changes of the mandibular area were measured relatively by the proportional ratios to the bone changes. The ratios at the mid-sagittal plane were $77\~102\%(p<0.05)$. The ratios at all other sagittal planes had similar patterns to the mid-sagittal plane, but with decreased values. And, the changes in the maxillary region were calculated as a ratio, relative to the movement of a point representing a mandibular movement. When B point was used as a representative point, the ratios were $14\~29\%$, and when Pog was used, the ratios were $17\~37\%(9<0.05)$. In case of the 83rd point of the grid, the ratios were $11\~22\%(p<0.05)$.

Home Appliance Position Recognition through Hand Pointing Command for Arbitrary Camera Location (손 지시 명령을 통한 임의의 카메라 배치에서의 가전기기 위치 인식)

  • Yang, Seung-Eun;Do, Jun-Hyeong;Jang, Hyo-Young;Jung, Jin-Woo;Park, Kwang-Hyun;Bien, Zeung-Nam
    • 한국HCI학회:학술대회논문집
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    • 2006.02a
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    • pp.362-367
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    • 2006
  • 지능형 주거공간에서 손 지시 명령을 통하여 가전기기를 선택하거나 로봇에게 이동하여야 하는 장소를 알려 주기 위해, 기존의 시스템은 선택되는 대상 기기의 3 차원 절대 위치를 미리 알고 있어야 한다. 또한 카메라 위치가 변동되었을 경우, 카메라의 위치를 절대좌표계 기준으로 새롭게 측정해야 하는 불편함이 있다. 이를 해결하기 위해 본 논문에서는 팬/틸트 모듈을 가진 두 대의 USB 카메라를 임의의 위치에 배치하더라도, 두 번의 손 지시만으로 선택 대상이 되는 기기의 3 차원 위치를 파악하고 이를 동작시키는 방법을 다룬다. 제안하는 방법에서는 두 대의 카메라 간의 상대 좌표계를 형성하기 위해 각 카메라에 표식을 부착한다. 각 카메라에서 다른 카메라의 표식을 관찰하면 카메라 간의 거리 및 각도를 구할 수 있기 때문에, 하나의 카메라를 기준으로 3 차원 절대 좌표계를 자동으로 설정할 수 있다. 또한, 두 대의 카메라로 사용자의 얼굴과 손을 검출하면 얻어진 기준 좌표계에 대해 얼굴과 손의 3 차원 위치를 계산하고, 두 지점을 연결하는 방향 벡터를 구함으로써 사용자가 손으로 지시하는 방향을 찾는다. 따라서, 카메라를 임의의 위치에 두더라도 사용자의 손 지시 동작만으로 대상체의 차원 위치를 파악할 수 있게 된다. 개발된 시스템의 유용성을 검증하기 위해 각 가전기기의 위치를 제안한 방법으로 구하고 실제 위치와의 오차를 분석하였다. 제안한 방법은 두 대의 USB 카메라와 일반 PC 또는 마이크로 프로세서만으로 구현할 수 있기 때문에 비용이 적게 들고 실시간 처리가 가능하며 사용자의 환경에서 편리성을 높이는 등 많은 장점을 가진다.

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Analysis of Combined Observation of GPS and EDM for the Otimum Control Point Selection (최적기준점 선정을 위한 GPS와 EDM의 수치계산 조합 분석)

  • Jung, Young-Dong;Park, Jung-Nam;Park, Sung-Kyu;Kang, Sang-Gu
    • Journal of Korean Society for Geospatial Information Science
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    • v.10 no.1 s.19
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    • pp.83-90
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    • 2002
  • Control point survey by GPS can save labor and time and can obtain result of high accuracy, but if excessive error is contained to Control point that is used to GPS relative positioning, the error that has influence on new point is propagated to various configuration. therefore poor triangulation points that are caused by careless management are existed, a product of the triangulation points still are in many case. In order to select new point, this study carried out error-analysis of surrounding-control-points and performed selective process of control point. The propriety parts of control points that are used to verify precision is identified by means of comparing existing product with or GPS product about some control points after directly observe each baseline by using EDM. As the error is analyzed by static positioning the optimum control point is selected, the precision of survey data by EDM is improved than GPS data.

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Development and Comparative Analysis of Mapping Quality Prediction Technology Using Orientation Parameters Processed in UAV Software (무인기 소프트웨어에서 처리된 표정요소를 이용한 도화품질 예측기술 개발 및 비교분석)

  • Lim, Pyung-Chae;Son, Jonghwan;Kim, Taejung
    • Korean Journal of Remote Sensing
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    • v.35 no.6_1
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    • pp.895-905
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    • 2019
  • Commercial Unmanned Aerial Vehicle (UAV) image processing software products currently used in the industry provides camera calibration information and block bundle adjustment accuracy. However, they provide mapping accuracy achievable out of input UAV images. In this paper, the quality of mapping is calculated by using orientation parameters from UAV image processing software. We apply the orientation parameters to the digital photogrammetric workstation (DPW) for verifying the reliability of the mapping quality calculated. The quality of mapping accuracy was defined as three types of accuracy: Y-parallax, relative model and absolute model accuracy. The Y-parallax is an accuracy capable of determining stereo viewing between stereo pairs. The Relative model accuracy is the relative bundle adjustment accuracy between stereo pairs on the model coordinates system. The absolute model accuracy is the bundle adjustment accuracy on the absolute coordinate system. For the experimental data, we used 723 images of GSD 5 cm obtained from the rotary wing UAV over an urban area and analyzed the accuracy of mapping quality. The quality of the relative model accuracy predicted by the proposed technique and the maximum error observed from the DPW showed precise results with less than 0.11 m. Similarly, the maximum error of the absolute model accuracy predicted by the proposed technique was less than 0.16 m.

Establishment of Correspondent points and Sampling Period Needed to Estimate Object Motion Parameters (운동물체의 파라미터 추정에 필요한 대응점과 샘플링주기의 설정)

  • Jung, Nam-Chae;Moon, Yong-Sun;Park, Jong-An
    • The Journal of the Acoustical Society of Korea
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    • v.16 no.5
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    • pp.26-35
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    • 1997
  • This paper deals with establishing correspondent points of feature pints and sampling period when we estimate object motion parameters from image information of freely moving objects in space of gravity-free state. Replacing the inertial coordinate system with the camera coordinate system which is equipped within a space robot, it is investigated to be able to analyze a problem of correspond points from image information, and to obtain sequence of angular velocity $\omega$ which determine a motion of object by means of computer simulation. And if a sampling period ${\Delta}t$ is shortened, the relative errors of angular velocity are increased because the relative errors against moving distance of feature points are increased by quantization. In reverse, if a sampling period ${\Delta}t$ is lengthened too much, the relative error are likewise increased because a sampling period is long for angular velocity to be approximated, and we confirmed the precision that grows according to ascending of resolution.

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