• 한국멀티미디어학회논문지
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• 제16권6호
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• pp.746-755
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• 2013

본 논문은 적외선 영상 시퀀스에서 2차원 양방향 필터 (bilateral filter)를 이용하여 표적의 공간적 정보를 추출하고, 시퀀스의 시간적 프로파일에서는 1차원 양방향 필터를 이용하여 표적의 시간적 정보를 추출하여 표적의 궤적을 검출하는 3차원 양방향 필터를 제안하였다. 평탄 배경 및 표적 영역, 에지 영역을 구별하기 위하여 2차원 영상에서는 공간적 분산값을 이용하며, 배경 프로파일 및 표적 프로파일, 에지 프로파일을 구별하기 위하여 화소의 시간적 프로파일에서는 시간적 분산값을 이용하였다. 이를 통하여 공간적으로는 표적이 없는 배경을 예측하고, 시간적으로는 표적이 없는 배경 프로파일을 생성한다. 최종적으로 공간적으로 예측된 배경 및 시간적으로 예측된 배경 프로파일을 이용하여 표적의 궤적을 추출한다. 기존 방법과 제안한 방법의 성능 비교를 위하여, ROC (receiver operating characteristics) 곡선을 실험에서 사용하였다. 실험결과에서 제안된 방법이 기존방법들보다 오경보율 (false alarm rate)이 낮고, 표적 및 배경에 대한 향상된 식별력을 가졌음을 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.211-214
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• 2002

A novel structuring element for the morphological filter is proposed in order to detect a small target at a long distance. The modeling of the structuring element is based on the real data and implemented by parametric model approach. Several synthetic

• 한국통신학회논문지
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• 제34권9C호
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• pp.863-870
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• 2009

양방향 필터 (bilateral filter)는 선명도를 증가시키고 노이즈를 감소시키는 비선형 필터이다. 양방향 필터는 두개의 가우시안 필터 (Gaussian filter) 즉, 도메인 필터 (domain filter) 및 레인지 필터 (range filter)에 의해 동작한다. 양방향 필터를 소형 표적 탐지에 적용하기 위하여, 이들 도메인 필터 및 레인지 필터의 표준 편차 (standard deviation)는 배경 영역 및 표적 영역 사이에서 적응적으로 가변되어야 한다. 본 논문은 국부 창의 에지 성분 분석에 기초하여 도메인 필터 및 레인지 필터의 표준 편차가 적응적으로 가변되며, 또한 가변 필터 크기를 가지는 새로운 양방향 필터를 제안한다. 이러한 필터 구조의 양방향 필터는 소형 표적 탐지 분야에서 표적 검출을 용이하게 하며, 실험 결과에서 제안한 표적 검출 알고리즘이 기존 알고리즘보다 강인하고 효율적임을 확인하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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• pp.174-177
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• 1995

Detecting a small threat object either fast moving or floating on shallow water presents a formidable challenge to shipboard sensor systems, which must determine whether or not to launch defensive weapons in a timely manner. An integrated multisensor concept is envisioned wherein the combined use of active and passive sensor is employed for the detection of short duration targets in dense ocean surface clutter to maximize detection range. The objective is to develop multisensor integration techniques that operate on detection data prior to track formation while simultaneously fusing contacts to tracks. In the system concept, detections from a low grazing angle search radar render designations to a sensor-search infrared sensor for target classification which in turn designates an active electro-optical sensor for sector search and target verification.

• 한국통신학회논문지
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• 제35권1C호
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• pp.8-16
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• 2010

본 논문은 적외선 영상 시퀀스 (infrared image sequences)에서 시간적 프로파일 (temporal profile)을 기반으로 한 시간적 화소 (temporal pixel)들의 외적 (cross product)을 사용한 새로운 소형 표적 검출 방법을 제안한다. 소형 표적 및 그 주변배경은 시간적 특성이 서로 다르므로, 시간적 프로파일에서 화소들의 외적을 사용한 가설검증을 통하여 표적 화소 및 배경화소를 구분하고, 그 결과를 기반으로 시간적 배경 (temporal background)을 예측한다. 소형 표적은 원 시간적 프로파일과 예측된 시간적 배경 프로파일의 차에 의해 검출한다. 기존 방법과 제안한 방법의 성능 비교를 위하여, ROC (receiver operating characteristics) 곡선을 실험에서 사용하였다. 실험결과에서 제안된 방법이 기존방법들보다 오경보율 (false alarm rate)이 낮고, 표적 및 배경에 대한 향상된 식별력을 가짐을 확인하였다.

• Journal of Microbiology and Biotechnology
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• 제31권9호
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• pp.1323-1329
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• 2021

Micro-scale magnetic beads are widely used for isolation of proteins, DNA, and cells, leading to the development of in vitro diagnostics. Efficient isolation of target biomolecules is one of the keys to developing a simple and rapid point-of-care diagnostic. A zinc finger protein (ZFP) is a double-stranded (ds) DNA-binding domain, providing a useful scaffold for direct reading of the sequence information. Here, we utilized two engineered ZFPs (Stx2-268 and SEB-435) to detect the Shiga toxin (stx2) gene and the staphylococcal enterotoxin B (seb) gene present in foodborne pathogens, Escherichia coli O157 and Staphylococcus aureus, respectively. Engineered ZFPs are immobilized on a paramagnetic bead as a detection platform to efficiently isolate the target dsDNA-ZFP bound complex. The small paramagnetic beads provide a high surface area to volume ratio, allowing more ZFPs to be immobilized on the beads, which leads to increased target DNA detection. The fluorescence signal was measured upon ZFP binding to fluorophore-labeled target dsDNA. In this study, our system provided a detection limit of ≤ 60 fmol and demonstrated high specificity with multiplexing capability, suggesting a potential for development into a simple and reliable diagnostic for detecting multiple pathogens without target amplification.

• 대한임베디드공학회논문지
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• 제17권2호
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• pp.101-107
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• 2022

In this article, we propose a new protocol at fast scan mode for a sea-surface small target detection. The conventional fast scan mode is composed of coherent intrascan integration to suppress sea clutter and non-coherent interscan integration to exclude sea spikes. The proposed method realizes the coherent interscan integration by the new Fourier relationship between carrier-frequency and initial-radial-range, which can be analytically derived by using multiple carrier frequencies at fast scan mode, leading to improved detection performance, compared to the conventional non-coherent methods. In simulations, our proposed method is verified.

• 한국컴퓨터정보학회논문지
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• 제23권11호
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• pp.1-7
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• 2018

In this paper, we propose soft dead pixels detection method by analysing different response at hot and cold images. Abnormal pixels are able to effect detecting a small target. It also makes confusing real target or not cause of changing target size. Almost exist abnormal pixels after image signal processing even if dead pixels are removed by dead pixel compensation are called soft dead pixels. They are showed defect in final image. So removing or compensating dead pixels are very important for detecting object. The key idea of this proposed method, detecting dead pixels, is that most of soft deads have different response characteristics between hot image and cold image. General infrared cameras do NUC to remove FPN. Working 2-reference NUC must be needed getting data, hot & cold images. The way which is proposed dead pixel detection is that we compare response, NUC gain, at each pixel about two different temperature images and find out dead pixels if the pixels exceed threshold about average gain of around pixels.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.400-403
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• 2003

This paper presents the signal processing of the panoramic thermal warning system that detects the small target such as aircraft and helicopter from afar. We develope the all round looking thermal imaging system which can scan all the way. This system acquires the panoramic images to reconstruct the IR images by revolving head of sensor typed line sensor at high speed. For detection, where the object of interest may be small, it is sometimes difficult to specify from object and background by conventional contrast enhancement methods. Therefore we use the adaptive plateau equalization algorithm each region to improve the contrast and make the hardware system which consists of the signal processing board for real-time display. We can verify the proposed method by the computer simulation and the hardware implementation.

• Journal of Radiation Protection and Research
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• 제43권4호
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• pp.154-159
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• 2018

Background: To prevent small leakage accidents, a real-time and direct detection system for small leaks with a detection limit below that of existing systems, e.g. $0.5gpm{\cdot}hr^{-1}$, is required. In this study, a small-size beta detector, which can be installed inside the reactor containment (CT) building and detect small leaks directly, was suggested and its feasibility was evaluated using MCNPX simulation. Materials and Methods: A target nuclide was selected through analysis of radiation from radionuclides in the reactor coolant system (RCS) and the spectrum was obtained via a silicon detector simulated in MCNPX. A window was designed to reduce the background signal caused by other nuclides. The sensitivity of the detector was also estimated, and its shielding designed for installation inside the reactor CT. Results and Discussion: The beta and gamma spectrum of the silicon detector showed a negligible gamma signal but it also contained an undesired peak at 0.22 MeV due to other nuclides, not the $^{16}N$ target nuclide. Window to remove the peak was derived as 0.4 mm for beryllium. The sensitivity of silicon beta detector with a beryllium window of 1.7 mm thickness was derived as $5.172{\times}10^{-6}{\mu}Ci{\cdot}cc^{-1}$. In addition, the specification of the shielding was evaluated through simulations, and the results showed that the integrity of the silicon detector can be maintained with lead shielding of 3 cm (<15 kg). This is a very small amount compared to the specifications of the lead shielding (600 kg) required for installation of $^{16}N$ gamma detector in inside reactor CT, it was determined that beta detector would have a distinct advantage in terms of miniaturization. Conclusion: The feasibility of the beta detector was evaluated for installation inside the reactor CT to detect small leaks below $0.5gpm{\cdot}hr^{-1}$. In future, the design will be optimized on specific data.