• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.39-44
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• 2008

본 논문에서는 변형한 가능 곡면에 가상의 텍스쳐를 투영하기 위한 프로젝터 기반의 실시간 기하 보정 시스템을 제안한다. 다수의 대응점들의 위치를 추적하기 위하여 사용되는 마커들은 프로젝터의 영상이 투영되더라도 그 흔적이 남아있어서 투영 영상을 훼손한다. 또한 출력 영상의 사전 기하 보정 과정에서 병목 현상이 발생하기 때문에 실시간 기하 보정 시스템의 구현이 어렵다. 따라서 본 논문에서는 마커 인식 과정에서 마커에 의해 투영 영상이 훼손되는 현상을 막기 위해 눈에 보이지 않는 적외선 마커를 사용하며, NVIDIA의 Cg ToolKit을 이용하여 고속의 GPU 연산을 수행함으로서 자연스러운 실시간 보정 영상의 출력이 가능하다. 본 논문의 실험 결과에서는 눈에 보이지 않는 마커가 그려진 종이 위에서 사용자와의 상호 작용이 가능한 디지털 영상을 투영한다. 이를 통해 증강 현실 기반의 다양한 디지털 콘텐츠 제작이 가능하다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집(한일합동학술편); 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.786-790
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• 1987

This paper describes a systein which enables a fast 3 -dimensional profile measurement using a slit-ray projection method. One distinctive feature of this system is that a real-time video is processor is employed in order to reduce the amount of image data to be processed without eliminating essential information. Experimental results show that a calibrating method presented for the TV camera and the slit-ray projector is convenient and enables sufficient accurate measurements.

• 한국정보전자통신기술학회논문지
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• 제1권3호
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• pp.111-117
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• 2008

시청각 수업이나, 세미나 등에서 프로젝터와 함께 레이저 포인터와 마우스, 키보드를 같이 사용하고 있으나 레이저 포인터와 함께 마우스나 키보드를 사용 시 불편을 초래한다. 따라서 본 논문에서는 레이저 포인터의 활용도를 높이기 위해 레이저 포인터를 이동하면 그 위치를 정확히 추적하고 그 정보를 표시함으로서 마우스 기능까지 수행할 수 있는 하드웨어를 구현하였다. 시스템은 FPGA로 카메라 인터페이스를 구현하고 ARM을 이용한 영상처리 소프트웨어와 패턴 추적을 위한 소프트웨어를 제작하였다. 레이저 포인터의 정확한 위치 파악과 처리속도를 높이기 위해 하드웨어로 잡음 처리기를 구현하여 사용하였고 소프트웨어로 스펙트럼을 분석하였다. 또한 자주 나타나는 레이저 포인터의 패턴을 저장하여 정확한 추적이 가능하도록 하였다. 구현결과 20M거리 이내에서 98%의 인식률을 확인하였다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1995년도 춘계학술대회
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• pp.164-166
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• 1995

The objectives of study are to develop a peripheral device on the endoscopic surgery system. These systems are consist of the following units. They are a color monitor of high resolution, light source, computer system and endoscopic camera with a C-mount head, irrigator, color video printer, Super VHS recorder and a system rack. The color monitor is a NTSC monitor for monitoring the image projected of the surgical section. The lightsource is necessary to irradiate the interior of a body via an optic fiber, The light projector will adapt the brightness in accordance with changing distance from the object. A miniature camera using a color CCD chip and computer system is used to capture and control an image of the surgical section[1]. The video printer is a 300 DPI resolution using thermal sublimation methods, which is developed by Samsung Electronics Co., Ltd. The specification of the endoscopic data management system is consist of storage of a captured image and pathological database of patients [2-4].

• 한국CDE학회논문집
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• 제16권6호
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• pp.437-448
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• 2011

A robotic spatial augmented reality (RSAR) system combines a robotics technology with a spatial augmented reality system (SAR) where cameras are used to recognize real objects and projectors augment information and user interface directly on the surface of the recognized objects, rather than relying on handheld display devices. Moreover, a robotic module is actively used to discover and utilize the context of users and environments. The control of a RSAR system involves several issues from different technical fields such as classical inverse kinematics of motors where projector-camera pairs are mounted, inverse projection problems to find appropriate internal/external parameters of projectors and cameras, and image warping in graphics pipeline to compensate the kinematic constraints. In this paper, we investigate various control issues related to a RSAR system and propose basic approaches to handle them, specially focused on the prototype RSAR system developed in ETRI.

• 전자공학회논문지S
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• 제35S권5호
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• pp.83-93
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• 1998

Three dimensional data acquisition system based on the structured light is developed in this work. The system is composed of a CCD camera, slide projector, and various image processing programs. Calibration procedures and several image processing steps which are necessary to get the rnage data are described. A new grid labeling technique and a grid pattern are devised to improve the accuracy of th eobtained data. Preliminary experimental result shows that the developed system may be used as a simple and cheap 3D data acquisition system. Severla suggestions are included for further research.

• IEIE Transactions on Smart Processing and Computing
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• 제3권4호
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• pp.195-204
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• 2014

This paper presents the depth evaluation for object detection by automated assembling robots. Pattern distortion analysis from a structured light system identifies an object with the greatest depth from its background. An automated assembling robot should prior select and pick an object with the greatest depth to reduce the physical harm during the picking action of the robot arm. Object detection is then combined with a depth evaluation to provide contour, showing the edges of an object with the greatest depth. The contour provides shape information to an automated assembling robot, which equips the laser based proxy sensor, for picking up and placing an object in the intended place. The depth evaluation process using structured light for an automated electronics assembling robot is accelerated for an image frame to be used for computation using the simplest experimental set, which consists of a single camera and projector. The experiments for the depth evaluation process required 31 ms to 32 ms, which were optimized for the robot vision system that equips a 30-frames-per-second camera.

• 제어로봇시스템학회논문지
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• 제22권3호
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• pp.186-191
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• 2016

This paper addresses the development of 3D data acquisition system (3D scanner) based laser structured-light image. The 3D scanner consists of a stripe laser generator, a conventional camera, and a rotation table. The stripe laser onto an object has distortion according to 3D shape of an object. By analyzing the distortion of the laser stripe in a camera image, the scanner obtains a group of 3D point data of the object. A simple semiconductor stripe laser diode is adopted instead of an expensive LCD projector for complex structured-light pattern. The camera has an optical filter to remove illumination noise and improve the performance of the distance measurement. Experimental results show the 3D data acquisition performance of the scanner with less than 0.2mm measurement error in 2 minutes. It is possible to reconstruct a 3D shape of an object and to reproduce the object by a commercially available 3D printer.

• 제어로봇시스템학회논문지
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• 제9권5호
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• pp.368-373
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• 2003

This paper presents a cost-effective 3D foot scanner system that provides the 3-dimensional point cloud foot data to design the custom footwear. To measure the 3-dimensional point cloud data of the foot, a CCD camera, a Non-Gaussian laser line projector and optical triangulation method are employed. Furthermore, the integrated system employs a measurement base, a frame grabber, a CCD moving cart, a stepping motor and a computer. The measurement result is saved as 3D dxf format and it could be converted to 2D essential data fer a shoe design. The experimental results demonstrate that the proposed system have the decent resolution of 1mm which is enough for last and shoe design.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1971-1975
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• 2003

This paper describes a technique, which analyzes the functional instability of the ankle using three-dimensional scanner. The technique is based on the structured light pattern projection method, which is performed by using one digital still camera and one LCD projector. This system can be easily realized with the low cost. The measuring result has high accuracy. The measuring error is about 0.2 mm or less. Using this technique the three-dimensional posture of the leg and foot of the target person are measured and analyzed.