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Study on Noise Reduction of DLP Projector (DLP 프로젝터의 소음 저감 연구)

  • 박대경;장동섭
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.132-137
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    • 2003
  • For the evaluation of acoustic noise of a DLP projector, vibration and sound characteristics of a DLP projector were studied. The acoustic noise of DLP projector could be classified into three categories, that is, the direct noise from a body of rotation, the air-bone noise generated from turbulence or vortex occurred during cooling process and the structural born noise produced by vibrating elements. Cooling fans and color filter wheel which rotates at 9000 rpm are main causes of acoustic noise induced in DLP projector. Since the structure of an optical module in a DLP projector can be excited by the excessive vibration of a color filter wheel, the structural design for anti-vibration should be considered. To make a reduction of overall acoustic noise, the anti-vibration design and the enclosing structure have been studied and applied to a color filter wheel.

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Study on Noise Reduction of DLP Front Home Theater Projector (가정용 DLP 프로젝터의 소음 저감에 관한 연구)

  • Jang Dong Seob;Park Chul Min;Park Dae Kyong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.9
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    • pp.861-867
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    • 2004
  • For the evaluation of acoustic noise of a DLP projector, vibration and sound characteristics of a DLP projector were studied. The acoustic noise of DLP projector could be classified into three categories, that is, the direct noise from a body of rotation, the air-bone noise generated from turbulence or vortex occurred during cooling process and the structural born noise produced by vibrating elements. Cooling fans and color filter wheel which rotates at 9000 rpm are main causes of acoustic noise induced in DLP projector. Since the structure of an optical module in a DLP projector can be excited by the excessive vibration of a color filter wheel, the structural design for anti-vibration should be considered. To make a reduction of overall acoustic noise, the anti-vibration design and the enclosing structure have been studied and applied to a color filter wheel.

Projection-Type Integral Imaging Using a Pico-projector

  • Yang, Yucheol;Min, Sung-Wook
    • Journal of the Optical Society of Korea
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    • v.18 no.6
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    • pp.714-719
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    • 2014
  • A pico-projector is a compact and mobile projector that has an infinite focus. We apply the pico-projector to a projection-type integral imaging system, which can expand the image depth to form multiple central depth planes. In a projection-type integral imaging system, the image flipping problem arises because the expanded elemental images pass through a lens array. To solve this problem, we propose the ray tracing of a pico-projector at a central depth plane and compensate the elemental image using a pixel-mapping process. Experiments to verify the proposed method are performed, and the results are presented.

Development and Test of a Tile Projector for Control of Low-frequency Underwater Echoes (저주파 수중 반향음 제어를 위한 타일형 프로젝터의 개발 및 성능시험)

  • Woo, Sangbeom;Lee, Jae-Wan;Ohm, Won-Suk;Kim, Wan-Gu;Kang, Hwi-Suk;Yoon, Suk Wang;Seo, Youngsoo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.630-634
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    • 2014
  • In this paper, a tile projector was developed for the control of low-frequency underwater echoes. The projector was designed to cover a wide area such as the hull of a submarine, and to have a relatively thin thickness. As a preliminary work for active echo control, the performance of the projector was measured in an anechoic water tank. The transmitting voltage response as well as the passive echo reduction were measured to evaluate the performance as an underwater projector.

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Finite Element Analysis of a Tile Projector for Control of Low-frequency Underwater Echoes (저주파 수중 반향음 제어를 위한 타일형 프로젝터의 유한요소 해석)

  • Lee, Jae-Wan;Woo, Sangbeom;Ohm, Won-Suk;Seo, Youngsoo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.625-629
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    • 2014
  • In this paper, a tile projector for the active control of low-frequency underwater echoes is studied using finite element method. Compared to the existing underwater actuators used for echo reduction, the tile projector is better suited for covering a wide area such as the hull of a submarine. In order to actively match the acoustic impedance at the water-object interface, the projector is driven to radiate a pressure wave that is the inverted replica of the echo at the interface. Finite element simulations demonstrate significant echo reductions due to the active impedance matching by the tile projector.

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Study on Noise Reduction of AV Projector

  • Kim, Sang-Hoon;Bok, Ki-So;Lee, Seung-Gyu
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1155-1158
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    • 2007
  • To reduce acoustic noise level of an AV projector, primary noise sources of AV projector were analyzed. Based on the analyzed result, methods to control each source are presented and tried. Structure-borne noise can be controlled by anti vibration design of mounting system, and air-borne noise by reducing flow resisitvity.

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An Easy Camera-Projector Calibration Technique for Structured Light 3-D Reconstruction (구조광 방식 3차원 복원을 위한 간편한 프로젝터-카메라 보정 기술)

  • Park, Soon-Yong;Park, Go-Gwang;Zhang, Lei
    • The KIPS Transactions:PartB
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    • v.17B no.3
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    • pp.215-226
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    • 2010
  • The structured-light 3D reconstruction technique uses a coded-pattern to find correspondences between the camera image and the projector image. To calculate the 3D coordinates of the correspondences, it is necessary to calibrate the camera and the projector. In addition, the calibration results affect the accuracy of the 3D reconstruction. Conventional camera-projector calibration techniques commonly require either expensive hardware rigs or complex algorithm. In this paper, we propose an easy camera-projector calibration technique. The proposed technique does not need any hardware rig or complex algorithm. Thus it will enhance the efficiency of structured-light 3D reconstruction. We present two camera-projector systems to show the calibration results. Error analysis on the two systems are done based on the projection error of the camera and the projector, and 3D reconstruction of world reference points.

Reserch and development of metal halide lamp for LCD projector back light (LCD PROJECTOR BACK LIGHT용 METAL HALIDE LAMP의 연구 및 개발)

  • 박창식;정의선;이승수
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.39-46
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    • 1995
  • Metal halide pamp for LCD projector back light is high technologlcal product with its consumption increasing by 30% a year according to LCD merchandise and we are whollydepending on imprtation. At this time exper iment. we achleved those results as below. 1. Reallzation of domestic production of 150W metal halide lamp for LCD progector back light and electrical ballatst. 2. Possession of self-designing and manufacturing technology of submlnlature metal halide lamp. 3. Possession of deslgning technology of electrlcal ballast for metal hallde lamp.

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Hard calibration of a structured light for the Euclidian reconstruction (3차원 복원을 위한 구조적 조명 보정방법)

  • 신동조;양성우;김재희
    • Proceedings of the IEEK Conference
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    • pp.183-186
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    • 2003
  • A vision sensor should be calibrated prior to infer a Euclidian shape reconstruction. A point to point calibration. also referred to as a hard calibration, estimates calibration parameters by means of a set of 3D to 2D point pairs. We proposed a new method for determining a set of 3D to 2D pairs for the structured light hard calibration. It is simply determined based on epipolar geometry between camera image plane and projector plane, and a projector calibrating grid pattern. The projector calibration is divided two stages; world 3D data acquisition Stage and corresponding 2D data acquisition stage. After 3D data points are derived using cross ratio, corresponding 2D point in the projector plane can be determined by the fundamental matrix and horizontal grid ID of a projector calibrating pattern. Euclidian reconstruction can be achieved by linear triangulation. and experimental results from simulation are presented.

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Implementation of Spatial Light Modulator(SLM) using a Commercial LCD Beam Projector

  • Ko, Jung-Hwan;Lee, Jae-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.9
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    • pp.1-10
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    • 2006
  • In this paper, a new high resolution XGA-SLM is implemented through modification of a commercial TFT-LCD beam projector and its optical modulation characteristics as a spatial light modulator(SLM) is also analyzed. First, the optics module, projection lamp and fans are removed from a commercial beam projector and instead some electric circuits to compensate their removal are manufactured and then, by inserting them into the beam projector, a new XGA-SLM is finally implemented. Second, from some optical experimental results, this TFT-SLM is found to have a good optical linearity in amplitude and phase modulation characteristics as a function of the input gray levels. Especially, through implementation of a binary phase-type correlator such as BPEJTC by using the suggested TFT-LCD panel, the implemented SLM is proposed as a new relatively low-cost and high resolution SLM for optical information processing.