• Title/Summary/Keyword: 센서 캘리브레이션

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A Study for Efficient Methods of System Calibration between Optical and Range Sensors by Using Simulation (시뮬레이션을 통한 광학 및 레인지 센서 간의 효율적인 시스템 캘리브레이션 설계)

  • Won Seok, Choi;Chang Jae, Kim;Yong Il, Kim
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.33 no.2
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    • pp.95-101
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    • 2015
  • The study planned to suggest the efficient methods of system calibration between the range and optical sensors. The simulation was performed by considering i) design of test-bed, ii) mathematical methods of system calibration and iii) locations of the sensors. The test-bed was designed by considering specifications of the range and optical sensors. Also, the error levels of each sensor were considered in the process of simulation with dataset, which was generated under these predetermined conditions. The system calibration was carried out by using the simulated dataset in two different approaches, which are single photo resection and bundle adjustment. The results from the simulation determined that the bundle adjustment method is more efficient than the single photo resection in the system calibration between range and optical sensors. For the better results, we have used the data, obtained in various locations. In a conclusion, the most efficient case was in sequence of i) the bundle adjustment with ii) the simulated dataset, which were obtained between 2m to 4m away from the test-bed.

Analysis on Mapping Accuracy of a Drone Composite Sensor: Focusing on Pre-calibration According to the Circumstances of Data Acquisition Area (드론 탑재 복합센서의 매핑 정확도 분석: 데이터 취득 환경에 따른 사전 캘리브레이션 여부를 중심으로)

  • Jeon, Ilseo;Ham, Sangwoo;Lee, Impyeong
    • Korean Journal of Remote Sensing
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    • v.37 no.3
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    • pp.577-589
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    • 2021
  • Drone mapping systems can be applied to many fields such as disaster damage investigation, environmental monitoring, and construction process monitoring. To integrate individual sensors attached to a drone, it was essential to undergo complicated procedures including time synchronization. Recently, a variety of composite sensors are released which consist of visual sensors and GPS/INS. Composite sensors integrate multi-sensory data internally, and they provide geotagged image files to users. Therefore, to use composite sensors in drone mapping systems, mapping accuracies from composite sensors should be examined. In this study, we analyzed the mapping accuracies of a composite sensor, focusing on the data acquisition area and pre-calibration effect. In the first experiment, we analyzed how mapping accuracy varies with the number of ground control points. When 2 GCPs were used for mapping, the total RMSE has been reduced by 40 cm from more than 1 m to about 60 cm. In the second experiment, we assessed mapping accuracies based on whether pre-calibration is conducted or not. Using a few ground control points showed the pre-calibration does not affect mapping accuracies. The formation of weak geometry of the image sequences has resulted that pre-calibration can be essential to decrease possible mapping errors. In the absence of ground control points, pre-calibration also can improve mapping errors. Based on this study, we expect future drone mapping systems using composite sensors will contribute to streamlining a survey and calibration process depending on the data acquisition circumstances.

The Laser Calibration Based On Triangulation Method (삼각법을 기반으로 한 레이저 캘리브레이션)

  • 주기세
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.4
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    • pp.859-865
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    • 1999
  • Many sensors such as a laser, and CCD camera to obtain 3D information have been used, but most of algorithms for laser calibration are inefficient since a huge memory and experiment data are required. This method saves a memory and an experimental data since the 3D information are obtained simply triangulation method. In this paper, the calibration algorithm of a slit km laser based on triangulation method is introduced to calculate 3D information in the real world. The laser beam orthogonally mounted on the XY table is projected on the floor. A CCD camera observes the intersection plane of a light and an object plane. The 3D information is calculated using observed and calibration data.

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Calibration Technique for Freehand 3-D Ultrasound System (3차원 초음파 시스템의 캘리브레이션 방법)

  • Hwang, Myun Joong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.12
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    • pp.6066-6071
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    • 2013
  • This paper proposes a calibration method for a freehand 3-D ultrasound system in medical robotic research. The calibration block with six wires was designed to set the fixed target points. The positions of the ultrasound probe and calibration block were measured using an optical tracker. The relationship between the position of the ultrasound probe and the pixel coordinates in the images was derived using a calibration process. The scaling matrix was also calculated. The experimental results showed that the proposed method could find solutions using a simple least square method from one or multiple ultrasound images.

The Slit Beam Laser Calibration Method Based On Triangulation (삼각법을 이용한 슬릿 빔 레이저 캘리브레이션)

  • 주기세
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 1999.05a
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    • pp.168-173
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    • 1999
  • Many sensors such as a laser, CCD camera to obtain 3D information have been used, but most of calibration algorithms are inefficient since a huge memory and an experiment data for laser calibration are required. In this paper, the calibration algorithm of a slit beam laser based on triangulation method is introduced to calculate 3D information in the real world. The laser beam orthogonally mounted on the XY table is projected on the floor. A Cm camera observes the intersection plane of a light and an object plane. The 3D information is calculated using observed and calibration data. This method saves a memory and an experimental data since the 3D information are obtained simply triangulation method.

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The Structured Grid Pattern Calibration Based On Triangulation Method (삼각법기반 구조화된 격자 패턴 캘리브레이션)

  • 주기세
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.5
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    • pp.1074-1079
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    • 2004
  • So far, many sensors such as a structured grid pattern generator, a laser, and CCD camera to obtain 3D information have been used, but most of algorithms for a calibration are inefficient since a huge memory and experiment time are required. In this paper, the calibration algorithm of a structured grid pattern based on triangulation method is introduced to calculate 3D information in the real world. The beams generated from structured grid pattern generator established horizontally with the CCD camera are projected on the calibration plat. A CCD camera measures the intersection plane of a projected beam and an object plane. The 3D information is calculated using measured and calibration datum. This proposed method in this paper has advantages such as a memory saving and an efficient experimental time since the 3D information is obtained simply the triangulation method.

Modeling and Calibration of Wrist Magnetic Sensor for Measuring Wrist Gesture (손목운동 측정을 위한 손목 자기장 센서의 모델링 및 캘리브레이션)

  • Yeo, Hee-Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.4
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    • pp.26-32
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    • 2020
  • Recently, as various wearable devices and IoT technologies have emerged and been applied to real applications, various sensors have been developed to satisfy their purposes and applied. In even In medical applications, IoT technologies have been applied gradually, and particularly, magnets and magnetic sensors have already been playing an important role in the medical industry. In wrist rehabilitation, this kind of sensor technology has enabled us to easily and conveniently measure wrist movement and gestures because there are no tangled lines required between the magnet and sensor. However, one of the drawbacks is that nonlinear output is generated because of the characteristics of a magnetic field. Also, the movement of the wrist joint involves small bones, and so it is not easy to simply model the movement. In order to resolve these issues and accurately measure sensor data, a calibration procedure is inevitable in the measurement. Thus, this paper proposes a practical model and simple calibration methods for measuring the distance between a magnet and a magnetic sensor.

Calibration of a UAV Based Low Altitude Multi-sensor Photogrammetric System (UAV기반 저고도 멀티센서 사진측량 시스템의 캘리브레이션)

  • Lee, Ji-Hun;Choi, Kyoung-Ah;Lee, Im-Pyeong
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.30 no.1
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    • pp.31-38
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    • 2012
  • The geo-referencing accuracy of the images acquired by a UAV based multi-sensor system is affected by the accuracy of the mounting parameters involving the relationship between a camera and a GPS/INS system as well as the performance of a GPS/INS system. Therefore, the estimation of the accurate mounting parameters of a multi-sensor system is important. Currently, we are developing a low altitude multi-sensor system based on a UAV, which can monitor target areas in real time for rapid responses for emergency situations such as natural disasters and accidents. In this study, we suggest a system calibration method for the estimation of the mounting parameters of a multi-sensor system like our system. We also generate simulation data with the sensor specifications of our system, and derive an effective flight configuration and the number of ground control points for accurate and efficient system calibration by applying the proposed method to the simulated data. The experimental results indicate that the proposed method can estimate accurate mounting parameters using over five ground control points and flight configuration composed of six strips. In the near future, we plan to estimate mounting parameters of our system using the proposed method and evaluate the geo-referencing accuracy of the acquired sensory data.

High Precision Hand Interface (고정밀 핸드 인터페이스)

  • Jang, Yong-Seok;Kim, Yong-Wan;Kim, Kyung-Hwan;Son, Wook-Ho
    • 한국HCI학회:학술대회논문집
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    • 2006.02a
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    • pp.136-141
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    • 2006
  • 가상 품평 또는 가상 훈련 시스템과 같은 고품질, 고정밀 가상현실 애플리케이션에서는 사용자에게 자연스러운 상호작용을 제공하기 위해 고정밀 핸드인터페이스 기술을 필요로 하고 있으나, 현재까지 개발된 상호작용 기술은 산업 현장에서 사용하기에는 어려움이 많다. 따라서 본 연구에서는 직관적이고 자연스러운 상호작용을 위한 기술로서 저항이나 광학 방식 등의 센서를 이용한 기존 연구에 비해 높은 해상도와 빠른 갱신율을 제공하는 절대 변위 센서를 사용한 고정밀 장갑형 핸드 인터페이스 장치 개발과 사용자에게 이질감을 주었던 기존의 투박한 실리던형 핸드 모델이 아닌 가변형 스킨매쉬 기법을 적용한 사실적 핸드 모델 가시화 기술 및 복잡하고 잦은 캘리브레이션 과정을 극복하기 위한 2 가지 형태의 간단한 손동작만으로도 정확하고 신속한 캘리브레이션 작업을 지원하는 매니지먼트 툴의 개발을 제시한다.

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Geometric Correction of Vehicle Fish-eye Lens Images (차량용 어안렌즈영상의 기하학적 왜곡 보정)

  • Kim, Sung-Hee;Cho, Young-Ju;Son, Jin-Woo;Lee, Joong-Ryoul;Kim, Myoung-Hee
    • 한국HCI학회:학술대회논문집
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    • 2009.02a
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    • pp.601-605
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    • 2009
  • Due to the fact that fish-eye lens can provide super wide angles with the minimum number of cameras, field-of-view over 180 degrees, many vehicles are attempting to mount the camera system. Camera calibration should be preceded, and geometrical correction on the radial distortion is needed to provide the images for the driver's assistance. However, vehicle fish-eye cameras have diagonal output images rather than circular images and have asymmetric distortion beyond the horizontal angle. In this paper, we introduce a camera model and metric calibration method for vehicle cameras which uses feature points of the image. And undistort the input image through a perspective projection, where straight lines should appear straight. The method fitted vehicle fish-eye lens with different field of views.

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