• Title/Summary/Keyword: Marker Recognition

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Wearable User Interface based on EOG and Marker Recognition (EOG와 마커인식을 이용한 착용형 사용자 인터페이스)

  • Kang, Sun-Kyoung;Jung, Sung-Tae;Lee, Sang-Seol
    • Journal of the Korea Society of Computer and Information
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    • v.11 no.6 s.44
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    • pp.133-141
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    • 2006
  • Recently many wearable computers have been developed. But they still have many user interface problems from both an input and output perspective. This paper presents a wearable user interface based on EOG(electrooculogram) sensing circuit and marker recognition. In the proposed user interface, the EOG sensor circuit which tracks the movement of eyes by sensing the potential difference across the eye is used as a pointing device. Objects to manipulate are represented human readable markers. And the marker recognition system detects and recognize markers from the camera input image. When a marker is recognized, the corresponding property window and method window are displayed to the head mounted display. Users manipulate the object by selecting a property or a method item from the window. By using the EOG sensor circuit and the marker recognition system, we can manipulate an object with only eye movement in the wearable computing environment.

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Posture Stabilization Control for Mobile Robot using Marker Recognition and Hybrid Visual Servoing (마커인식과 혼합 비주얼 서보잉 기법을 통한 이동로봇의 자세 안정화 제어)

  • Lee, Sung-Goo;Kwon, Ji-Wook;Hong, Suk-Kyo;Chwa, Dong-Kyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1577-1585
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    • 2011
  • This paper proposes a posture stabilization control algorithm for a wheeled mobile robot using hybrid visual servo control method with a position based and an image based visual servoing (PBVS and IBVS). To overcome chattering phenomena which were shown in the previous researches using a simple switching function based on a threshold, the proposed hybrid visual servo control law introduces the fusion function based on a blending function. Then, the chattering problem and rapid motion of the mobile robot can be eliminated. Also, we consider the nonlinearity of the wheeled mobile robot unlike the previous visual servo control laws using linear control methods to improve the performances of the visual servo control law. The proposed posture stabilization control law using hybrid visual servoing is verified by a theoretical analysis and simulation and experimental results.

Enhancement of the Correctness of Marker Detection and Marker Recognition based on Artificial Neural Network (인공신경망을 이용한 마커 검출 및 인식의 정확도 개선)

  • Kang, Sun-Kyung;Kim, Young-Un;So, In-Mi;Jung, Sung-Tae
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.1
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    • pp.89-97
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    • 2008
  • In this paper, we present a method for the enhancement of marker detection correctness and marker recognition speed by using artificial neural network. Contours of objects are extracted from the input image. They are approximated to a list of line segments. Quadrangles are found with the geometrical features of the approximated line segments. They are normalized into exact squares by using the warping technique and scale transformation. Feature vectors are extracted from the square image by using principal component analysis. Artincial neural network is used to checks if the square image is a marker image or a non-marker image. After that, the type of marker is recognized by using an artificial neural network. Experimental results show that the proposed method enhances the correctness of the marker detection and recognition.

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Marker Recognition System for the User Interface of a Serious Case (중증환자 인터페이스를 위한 마커 인식 시스템)

  • So, In-Mi;Kang, Sun-Kyung;Kim, Young-Un;Jung, Sung-Tae
    • The KIPS Transactions:PartB
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    • v.14B no.3 s.113
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    • pp.191-198
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    • 2007
  • In this paper, we present a marker detection and recognition method from camera image for a disabled person to interact with a server system which can control appliance of surrounding environment. It converts the camera image to a binary image by using multi-threshold and extracts contours of objects in the binary image. After that, it approximates the contours to a list of line segments. It finds rectangular markers by using geometrical features which are extracted from the approximated line segments. It normalizes the shape of extracted markers into exact squares by using the warping technique. It extracts feature vectors from marker image by using principal component analysis and then recognizes the marker. The proposed marker recognition system is robust for light change by using multi-threshold. Also, it is robust for angular variation of camera by using warping technique and principal component analysis. Experimental results show that the proposed method achieves 100% recognition rate at maximum for 21 markers and execution speed of 12 frames/sec.

User interface of Home-Automation for the physically handicapped Person in wearable computing environment (웨어러블 환경에서의 수족사용 불능자를 위한 홈오토메이션 사용자 인터페이스)

  • Kang, Sun-Kyung;Kim, Young-Un;Han, Dae-Kyung;Jung, Sung-Tae
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.5
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    • pp.187-193
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    • 2008
  • Interface technologies for a user to control home automation system in wearable computing environment has been studied recently. This paper proposes a new interface method for a disabled person to control home automation system in wearable computing environment by using EOG sensing circuit and marker recognition. In the proposed interface method, the operations of a home network device are represented with human readable markers and displayed around the device. A user wearing a HMD, a video camera, and a computer selects the desired operation by seeing the markers and selecting one of them with eye movement from the HMD display The requested operation is executed by sending the control command for the selected marker to the home network control device. By using the EOG sensing circuit and the marker recognition system a user having problem with moving hands and fit can manipulate a home automation system with only eye movement.

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Rectangular Marker Recognition using Embedded Context Information (맥락 정보를 이용한 장방형 마커 인식 및 증강현실 응용)

  • Lee, Won-Woo;Woo, Woon-Tack
    • 한국HCI학회:학술대회논문집
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    • 2009.02a
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    • pp.74-79
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    • 2009
  • Fiducial markers have been used frequently in augmented reality applications. However, they represent only ID information to identify a marker, and thus they have limitations when we have multiple types of markers. In this paper, we propose a new marker design for augmented reality applications. We embed a marker’s context, such as type, size, orientation, and ID, in the barcode that has been used just for storing an ID. BY embedding the context information, it is possible to recognize multiple types of markers at once and to render corresponding contents with proper scale. Our marker design can be used in a mobile augmented reality environment where many unknown types of markers may exist.

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An Augmented Reality Solution for Improving Marker Recognition and Solving Human Occlusion (마커인식 개선과 인체가 가려지는 문제해결을 위한 증강현실 솔루션)

  • Lu, Chengnan;Park, Jongyeol;Park, Jinho
    • Journal of Korea Game Society
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    • v.20 no.2
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    • pp.183-192
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    • 2020
  • Due to the problem of matching between virtual world space and real-world space, the reality of augmented reality content is rather low. There are many reasons for this result, firstly virtual object is rendered without considering relation between real-world space and virtual world space. Secondly, virtual objects rely too much on the marker to reduce reality. We propose two schemes to improve the reality of augmented reality, one is people occlusion, the other is to reduce the dependence of virtual objects on the marker.

A Study on Development of Cultural Assets Map Using AR Multi-Marker Recognition Technology (AR다중마커 인식 기술을 활용한 문화재 지도 개발 연구)

  • Kim, Mi-ri;Song, Eun-jee
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2019.05a
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    • pp.87-89
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    • 2019
  • The existing curriculum of cultural assets compulsory curriculum is difficult to expect educational effect due to lack of interests and visibility. The purpose of this study is to develop application contents and teaching materials using cultural data 3 - D data based on multi - marker recognition technology of augmented reality, which is attracting attention in the era of the 4th industrial revolution. In the case of the contents of a multi-marker technology capable of recognizing a plurality of markers, various events can be added and output capability can be enhanced. The proposed augmented reality app will be applied to the study of various education contents production technology utilizing cultural properties.

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A Study on Stable Service of Marker based Augmented Reality Using 3D Location Measurement of Beacons (3차원 비콘 위치측정을 이용한 마커기반 증강현실의 안정적 서비스에 관한 연구)

  • Jung, Ji-Jung;Lee, Gwang;Kim, Bong-Keun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.5
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    • pp.883-890
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    • 2017
  • Among the augmented reality services, the most frequently used services are marker based augmented reality services. However, there is a problem that the augmented reality service can not be provided in an environment in which the marker image can not be recognized. In this paper, we propose a method to provide more stable service by estimating the user's posture even if the marker image can not be correctly recognized due to occlusion, obstacle or marker damage in the marker based augmented reality. In the proposed method, when a failure occurs in the provision of a marker based augmented reality, the attitude of the user is estimated using the 3-dimensional coordinates measured through communication between the three beacons and the user, and it allows the user to receive the augmented reality service continuously. We describe the scenario of augmented reality technique using proposed marker recognition and beacon communication, and present the results of experiments based on the degree of occlusion and damage.

A Filtering Technique for Stable Marker Tracking in Mobile Augmented Reality (모바일 증강현실 환경에서 안정적인 마커 추적을 위한 필터링 기법)

  • Yoon, Chang-Pyo;Lee, In-Kyung;Hwang, Chi-Gon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.05a
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    • pp.297-299
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    • 2017
  • Recently, the application fields of augmented reality(AR) are rapidly increasing, and related contents are also increasing in demand. In this way, object-based marker recognition is required for service of AR contents in mobile environment. At this time, in order to provide information corresponding to the marker, a technique of generating and servicing a virtual object corresponding to a specific marker is used. However, when a virtual object corresponding to a marker is held on the AR screen, a phenomenon occurs that an object of the marker unstably shakes due to various reasons such as camera shake and camera movement. As described above, the AR service based on the mobile device has a problem that it is difficult to represent objects stably. In this paper, we propose a stable marker recognition and tracking technique by applying the filtering technique according to the physical state change of the device when recognizing fixed markers in mobile AR environment.

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