• Journal of Information Display
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• 제5권1호
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• pp.41-46
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• 2004

In this paper, a new stereo 3D moving-target tracking system using the MSE (mean square error) and BPEJTC (binary phase extraction joint transform correlator) algorithms is proposed. A moving target is extracted from the sequential input stereo image by applying a region-based MSE algorithm following which, the location coordinates of a moving target in each frame are obtained through correlation between the extracted target image and the input stereo image by using the BPEJTC algorithm. Through several experiments performed with 20 frames of the stereo image pair with $640{\times}480$ pixels, we confirmed that the proposed system is capable of tracking a moving target at a relatively low error ratio of 1.29 % on average at real time.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
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• pp.68-69
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• 2001

스테레오 물체 추적을 위해서는 추적 물체의 현재 위치를 추출하는 것이 선행 되어야한다. 입력된 좌측 영상과 이전 프레임에서 얻은 윈도우 마스크(window mask)의 기준 영상간에 식 (1)의 MSE 알고리즘을 적용하였다. 여기에서 윈도우 마스크의 기준 영상은 초기에만 추적을 원하는 물체를 마스크로 잡아(locking) 초기화 시켜 주면, 이후에는 스스로 계속 갱신(update)하게 된다. (중략)

• 방송공학회논문지
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• 제7권3호
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• pp.248-261
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• 2002

본 논문에서는 스테레오 비젼 시스템의 3차원 정보에 의해 가변되는 윈도우 마스크와 광 BPEJTC(binary phase extraction joint transform correlator)를 이용하여 스테레오 카메라를 제어하는 새로운 3차원 물체추적 시스템을 제안하였다. 즉, 스테레오 비젼 시스템의 구성 요소에 의해 3차원 정보인 추적 물체까지의 거리 정보를 쉽게 구할 수 있고, 이 거리 정보로 윈도우 마스크를 가변 시켜 추적물체 영역을 추출할 수 있다. 이 추적물체 영역은 다음 기준영상으로 갱신하여 사용된다. 그리고 이 기준영상과 스테레오 입력 영상간에 광 BPEJTC를 실행하여 추적 물체의 위치 값을 구하고. 이 값으로 스테레오 카메라의 주시각과 팬/틸트를 제어하여 3차원 물체추적이 이루어진다. 실험 결과 제안한 알고리즘은 스테레오 입력 영상에서 배경잡음과 관계없이 추적 물체영역을 추출하여 3차원 물체추적이 가능하고, 이의 구현으로 3차원 원격작업 시스템이나 적응적인 3차원 물체 추적기 등의 구현 가능성을 제시하였다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1994년도 하계종합학술발표회 논문집
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• pp.362-366
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• 1994

• 한국통신학회:학술대회논문집
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• 한국통신학회 1996년도 하계종합학술발표회 논문집(상)
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• pp.362-365
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• 1996

• 전자공학회논문지A
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• 제33A권10호
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• pp.152-159
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• 1996

We have designed and implemented an optoelectronic hardware of binary phase extraction joint transform correlator (BPEJTC) which provides higher peak-to-sidelobe ratio than many other versions of JTC that has been published so far and does not produce correlation peaks due to intra-class association, to construct a multi-target tracking system. The digital processing unit controlling the entire system plays the part of modifying and binarizing the joint transform power spectrum (JTPS) and the optical processing unit is mainly used to take fourier transform operations. Some experimental results conducted by designed system along with its architecture showed the processing rate of 6 frames per second, thereby the potential applicability of the proposed system to real-time multitarget tracking system is given.

• 한국안전학회지
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• 제14권2호
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• pp.192-199
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• 1999

본 논문에서는 안전검증 분야로의 응용을 위하여 circular harmonic filter(CHF)와 binary phase extraction joint transform correlator(BPEJTC)에 근거한 회전불변 지문인식 시스템을 제안하였다. 본 시스템은 이동 및 회전 변화에 강건하며 실시간으로 지문을 인식할 수 있는 특징을 지닌다. 실시간 구현을 위하여 회전불변 특성을 얻기 위한 복소 CHF는 실수로 구성된다. 시뮬레이션을 통해 본 시스템이 회전된 지문에 대해 강건한 특성이 있음을 보였다.

• 조명전기설비학회논문지
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• 제20권9호
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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.

• 전자공학회논문지A
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• 제31A권10호
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• pp.54-62
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• 1994

The optical JTC system has the advantage of being applied to the real-time correlation system, but it has some difficulties that its amplitude and phase signals cannot be separately processed. Recently to solve those problems the BPEJTC and HPEJTC systemshaving the same characteristics of that of the POC and POF have been proposed. But there is no quantitive analysis how much the amplitude and phase signals are contributed to the correlation outputs respectively. In this paper, a new ACJTC system based on the conventional ACMF is proposed and discussed through the mathematical analysis. The good correlation discrimination of the proposed system is also analyzed by changing the relative contributions of the phase and amplitude signals for some similar targets. From the successful computer simulation results on the scenario where three same targets are periodically located on the natural backgrround, the possibility of the high performance real-time correlation system based on the optical ACJTC is suggested.

• 전자공학회논문지A
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• 제31A권6호
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• pp.78-87
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• 1994

In this paper, a binary phase extraction joiont transform correlator (BPEJTC)system is proposed as a new phase-type optical correlator in which the correlation errors and DC component are dramtically reduced and optical efficiency and correlation performance are also improved by reconstructing the joint transform power spectrum (JTPS) of the conventional joint transform correlator (JTC)system form which the autocorrelation and crosscorrelation siganls generated in each self-plane are removed, and the binary phase function is extracted from the phase value of the reconstructed JTPS. Through some computer simulation and optical experimental results, the possibility of the implementation of the real-time multi-target tracking and recognition system is also suggested.