• 한국통신학회논문지
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• 제31권5C호
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• pp.512-518
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• 2006

몰입감을 향상시키는 초대형 화면을 생성하기 위하여 여러 개의 프로젝터에서 투사되는 영상을 연결하여 마치 하나의 프로젝터에서 투사되는 영상처럼 보이게 하는 기술에 대한 연구가 활발히 진행 되고 있다. 각 프로젝터의 밝기는 그 모델이나 램프의 사용기간에 따라서 달라진다. 이를 보정하기 위하여 여러 프로젝터에서 투사된 영상들의 밝기를 균일하게 맞추는 일이 중요하다. 기존의 방법들은 프로젝터의 밝기 값만을 고려한 방법으로 밝기 보정을 하면 디스플레이 되는 화면이 어두워지는 경향이 있다. 본 논문에서는 프로젝터의 밝기만을 고려하던 기존의 밝기 보정 방법들과는 달리 프로젝터의 입력 영상의 밝기를 고려한 프로젝터의 밝기 보정방법을 제안하였다. 그 결과 기존의 방법들에 비해 멀티 프로젝터를 사용하여 스크린에 투사된 영상들의 밝기를 개선하여 자연스러운 영상을 얻을 수 있다. 이상의 과정을 simulation하여 그 동작을 확인하였고, 실제 영상에 적용하여 그 성능의 우수성을 입증하였다.

• Journal of Information Display
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• 제11권2호
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• pp.76-83
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• 2010

This paper presents the multi-user autostereoscopic 3D display system constructed and operated by the authors using the time-multiplexing approach. This prototype has three main advantages over the previous versions developed by the authors: its hardware was simplified as only one optical array is used to create viewing regions in space, a lenticular multiplexing screen is not necessary as images can be produced sequentially on a fast 120Hz LCD with full resolution, and the holographic projector was replaced with a high-frame-rate digital micromirror device (DMD) projector. The whole system in this prototype consists of four major parts: a 120Hz high-frame-rate DMD projector, a 49-element optical array, a 120Hz screen assembly, and a multi-user head tracker. The display images for the left/right eyes are produced alternatively on a 120Hz direct-view LCD and are synchronized with the output of the projector, which acts as a backlight of the LCD. The novel steering optics controlled by the multiuser head tracker system directs the projector output to regions referred to as exit pupils, which are located in the viewers’eyes. The display can be developed in the "hang-on-the-wall"form.

• International Journal of Contents
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• 제12권2호
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• pp.1-5
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• 2016

Extensible 3D (X3D) is the ISO standard for defining 3D interactive web- and broadcast-based 3D content integrated with multimedia. With the advent of this integration of interactive 3D graphics into the web, users can easily produce 3D scenes within web contents. Even though there are diverse texture nodes in X3D, projective textures are not provided. We enable X3D to provide SingularProjectiveTexture and MultiProjectiveTexture nodes by materializing independent nodes of projector nodes for a singular projector and multi-projector. Our approach takes the creation of an independent projective texture node instead of Kamburelis's method, which requires inconvenient and duplicated specifications of two nodes, ImageTexture and Texture Coordinate.

• 제어로봇시스템학회논문지
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• 제17권11호
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• pp.1168-1172
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• 2011

Beam projector is popularly used for presentation. In order to pay attention to local area of the beam projector display, a laser pointer is used together with a pointing device(Mouse). Simple wireless presenter has limited functions of a pointing device such as "go to next slide" or "back to previous slide" in a specific application(Microsoft PowerPoint) through wireless channel; thus, there is inconvenience to do other tasks e.g., program execution, maximize/minimize window etc. provided by clicking mouse buttons. The main objective of this paper is to implement a multi-functional laser-pointer mouse that has the same functions of a computer mouse. In order to get position of laser spot in the projector display, an image processing to extract the laser spot in the camera image is required. In addition, we propose a transformation of the spot position into computer display coordinates to execute mouse functions on computer display.

• 전자공학회논문지CI
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• 제38권6호
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• pp.70-81
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• 2001

본 논문에서는 한 개의 카메라와 한 대의 환등기(LCD 환등기 혹은 슬라이드 환등기)를 이용하여 2차원 얼굴 영상으로부터 3차원 얼굴 형상을 모델링하는 방법을 제안한다. 환등기를 이용하여 사람 얼굴에 라이트 빔을 투영하고 이를 조금씩 이동시키며 영상을 획득한 뒤 각 2차원 영상의 지역적 정보와 영상들 사이의 시간적 정보를 함께 이용하여 3차원 형상을 복원하는 방법을 채택하였다. 제안된 방법에서는 특정이 서로 다른 영역들의 효과적인 3차원 좌표 모델링을 위해 영상을 그림자 부분 얼굴 부분 그리고 머리카락 부분으로 나누어 처리하는 지역 분할(region segmentation) 기법을 도입하였고, 2차원 얼굴 영상 획득 시간을 줄이고 고속 3차원 스캔을 위하여 한 영상 안에 다수의 라이트 빔(multiple light beams)을 이용하였다. 또 한 라이트 빔의 경계를 정확하게 검출하기 위하여 라이트 빔 캘리브레이션(light beam calibration) 기법을 제안하여 사용하였다. 실험 결과 제안한 방법을 통해서 머리카락 부분을 포함한 전체 얼굴 영역에서 향상된 3차원 모델링 결과를 얻을 수 있었다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2022년도 추계학술발표대회
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• pp.288-289
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• 2022

In this paper, we propose a method of obtaining high density geometric information using multi-view structured light. Reconstruction error due to the difference in resolution between the projector and the camera occurs when reconstruction a 3D shape from a structured light system to a single projector. This shows that the error in the point cloud in 3D is also the same when reconstruction the shape of the object. So we propose a high density method using multiple projectors to solve such a reconstruction error.

• International Journal of Advanced Culture Technology
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• 제1권1호
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• pp.15-18
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• 2013

This paper describes new gestures on the Multi-touch table. The 2 new gestures with 3 fingers are used for minimizing of all windows that is already open and converting Aero mode. We also implement a FTIR (Frustrated Total Internal Reflection) Multi-touch table that consists of sheet of acrylic, infrared LEDs, camera and rear projector. The operation of proposed gestures is verified on the implemented Multi-touch table.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.437-444
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• 2012

In this paper, the measurement method of the decoupling performance of a underwater decoupling material is studied. First, the simple vibro-acoustic coupled model of a multi-layered underwater decoupling material attached to a plate is analytically derived using impedance transfer matrix. Two test methods are introduced using the theoretical expression of the simple model. One is based on the ratio of the plate vibration and the radiated pressure under impact excitation of the plate. The other is based on the reciprocity theorem and uses the ratio of the incident pressure and the plate vibration under projector excitation in water. Some measurements are carried out according to the test methods using a pulse tube. The test results show the advantages and disadvantages of two methods. It is also shown that the combination of impact and projector excitation methods may be a useful tool to evaluate the performance of a underwater decoupling material.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.347-347
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• 2000

Nowadays, the Laser image is used to realize multi-media show for events, an advertising media and 3D simulation, realization of video image and so on. It is a hot issue to realize the laser image like computer graphic image. The image used in laser projector is vector graphic image that is described by linking point to point. A computer makes this continuous vector graphic images so that the image shows as an animation. A control signal converted by a computer makes the laser projector draw image. Two motors and universal joint are used to realize 2D laser image in this study. Developing a controller applied Look-ahead algorithm and software to interface with personal computer, This study is the chief aim of improving difference of moving velocity that is appeared from edge of vector graphic image and disparity of graphic density.

• 반도체디스플레이기술학회지
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• 제9권2호
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• pp.87-90
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• 2010

A new SRAM pixel circuit with RESET Transistor of a LCOS display module was designed for a pico-projector application. A dual-block PWM method was also proposed to realize the field sequential color system having only one LCOS panel. 0.29 inch LCOS panel in SVGA resolution was fabricated and the proposed dual-block PWM method was tested with it. Discontinuity of brightness curve was caused due to multi-pulses and it was improved by the adoption of proper mapping table. With the proposed SRAM with RESET pixel circuit and dual-block PWM method, the test images were successfully demonstrated.