• Title/Summary/Keyword: 적외선 영상 투사기

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A Read-In Integrated Circuit for IR Scene Projectors Adopting a Sub-Frame Control Technique for Minimizing the Temperature Loss (온도 손실의 최소화를 위해 Sub-Frame 제어 기법을 적용한 적외선 영상 투사기용 신호입력회로)

  • Shin, Uisub;Cho, Min Ji;Kang, Woo Jin;Jo, Young Min;Lee, Hee Chul
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.8
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    • pp.113-118
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    • 2016
  • In this paper, a read-in integrated circuit (RIIC) for IR scene projectors (IRSPs) adopting a sub-frame control technique is proposed, which minimizes the reduction of the apparent temperature of the IR images projected from IRSPs operating at a frame rate of 30 Hz. The proposed sub-frame control technique significantly reduces the amount of scene data loss on capacitors, which is caused by leakage currents flowing through MOSFET switches during holding periods, by dividing a unit frame into 8 sub-frames and refreshing the same scene data for each sub-frame. A current-drive RIIC was designed for the higher apparent temperature of IR radiated from the emitter, and it receives the scene data as a form of analog voltages from an external DAC. A prototype chip with a $64{\times}32$ RIIC array was fabricated using Magnachip/SKhynix $0.35{\mu}m$ 2-poly 4-metal CMOS process, and the measured maximum output data current is $230.3{\mu}A$. This amount of current ensures the projection of IR images whose maximum apparent temperature is $366.2^{\circ}C$ in the mid-wavelength IR (MWIR) when applied to a prototype emitter having a resistance of $15k{\Omega}$.

The analysis on properties of IR emitter unit device fabricated by using MEMS technology for Infrared Scene Projector (MEMS 기술을 이용하여 제작한 적외선 영상 투사용 에미터 단위 소자의 특성 분석)

  • Park, Ki Won;Shin, Young Bong;Kang, In-Ku;Lee, Hee Chul
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.3
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    • pp.31-36
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    • 2017
  • In this paper, designed infrared (IR) emitter device for infrared scene projector (IRSP) which is used for evaluating the performance of IR sensor systems was simulated by using finite element analysis (FEA) tool and fabricated by using MEMS (Micro Electro-Mechanical System) technology. The performance of the fabricated IR emitter unit device was characterized in the vacuum chamber by using IR image microscope for MWIR($3{\sim}5{\mu}m$), which showed 423K apparent temperature (Tapp) and 22msec time constant (${\tau}$).

A Stereo Video Avatar for Supporting Visual Communication in a $CAVE^{TM}$-like System ($CAVE^{TM}$-like 시스템에서 시각 커뮤니케이션 지원을 위한 스테레오 비디오 아바타)

  • Rhee Seon-Min;Park Ji-Young;Kim Myoung-Hee
    • Journal of KIISE:Computer Systems and Theory
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    • v.33 no.6
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    • pp.354-362
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    • 2006
  • This paper suggests a method for generating high qualify stereo video avatar to support visual communication in a CAVE$^{TM}$-like system. In such a system because of frequent change of light projected onto screens around user, it is not easy to extract user silhouette robustly, which is an essential step to generate a video avatar. In this study, we use an infrared reflective image acquired by a grayscale camera with a longpass filter so that the change of visible light on a screen is blocked to extract robust user silhouette. In addition, using two color cameras positioned at a distance of a binocular disparity of human eyes, we acquire two stereo images of the user for fast generation and stereoscopic display of a high quality video avatar without 3D reconstruction. We also suggest a fitting algorithm of a silhouette mask on an infrared reflective image into an acquired color image to remove background. Generated stereo images of a video avatar are texture mapped into a plane in virtual world and can be displayed in stereoscopic using frame sequential stereo method. Suggested method have advantages that it generates high quality video avatar taster than 3D approach and it gives stereoscopic feeling to a user 2D based approach can not provide.