• Title/Summary/Keyword: 다중검출

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Performance Analysis of Multi-user Detector in DS-CDMA for Two-Wire Transmission System (2선식 전송 시스템을 위한 DS-CDMA방식 다중사용자 검출기의 성능 분석)

  • 신재욱;송봉섭김환우백제인
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.27-30
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    • 1998
  • 본 논문에서의 기존의 2선식 댁내 망을 이용하여 ISDN PRI(2.048MHz)급의 전송을 위해 DS-CDMA방식을 적용하는 방법을 제안한다. TE 와 NT 의 신호의 검출을 위해 자기의 확산코드와 정합된 단일 사용자 검출기를 사용할 수 있으나, 검출하려는 신호와 다른 사용자 신호간의 다원접속간섭(Multiple Access Interference)에 의해 시스템의 성능이 저하된다. 본 논문에서는 다원접속간섭을 효과적으로 제거할 수 있는 최소평균제곱오차 (Minimum Mean Squared Error) 다중사용자 간섭제거기를 사용하고 컴퓨터 모의실험을 통하여 성능을 분석한다.

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Multi Fingertip Detection Method (다중 손끝점 검출 기법)

  • Yu, Sunjin;Koh, Wan Ki;Kim, Sang Hoon
    • Proceedings of the Korea Information Processing Society Conference
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    • 2013.11a
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    • pp.1718-1720
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    • 2013
  • 본 논문에서는 다중 손 끝점 검출을 위해 특징 추출 기법 및 이를 기반으로 한 손 끝점 검출 알고리즘을 제안한다. 특징 추출을 위해 Local Binary Feature(LBP)을 사용하였고 특징의 차원을 축소하기 위해 Principal Component Analysis(PCA) 기법을 이용하였다. 손 끝점 판별을 위해 Reduced multivariate polynomial Model(RM) Classifier를 사용하여 실험 결과 제안된 손 끝점 검출 기법이 다양한 환경에서 동작 하는 것을 확인 하였다.

Eye Localization based on Multi-Scale Gabor Feature Vector Model (다중 스케일 가버 특징 벡터 모델 기반 눈좌표 검출)

  • Kim, Sang-Hoon;Jung, Sou-Hwan;Oh, Du-Sik;Kim, Jae-Min;Cho, Seong-Won;Chung, Sun-Tae
    • The Journal of the Korea Contents Association
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    • v.7 no.1
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    • pp.48-57
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    • 2007
  • Eye localization is necessary for face recognition and related application areas. Most of eye localization algorithms reported thus far still need to be improved about precision and computational time for successful applications. In this paper, we propose an improved eye localization method based on multi-scale Gator feature vector models. The proposed method first tries to locate eyes in the downscaled face image by utilizing Gabor Jet similarity between Gabor feature vector at an initial eye coordinates and the eye model bunch of the corresponding scale. The proposed method finally locates eyes in the original input face image after it processes in the same way recursively in each scaled face image by using the eye coordinates localized in the downscaled image as initial eye coordinates. Experiments verify that our proposed method improves the precision rate without causing much computational overhead compared with other eye localization methods reported in the previous researches.

Multi Characters Detection Using Color Segmentation and LoG operator characteristics in Natural Scene (자연영상에서 컬러분할과 LoG연산특성을 이용한 다중 문자 검출에 관한 연구)

  • Shin, Seong;Baek, Young-Hyun;Moon, Sung-Ryong
    • Journal of the Korean Institute of Intelligent Systems
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    • v.18 no.2
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    • pp.216-222
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    • 2008
  • This paper proposed the multi characters detection algorithm using Color segmentation and the closing curve feature of LoG Operator in order to complement the demerit of the existing research which is weak in complexity of background, variety of light and disordered line and similarity of left and background color, etc. The proposed multi characters detection algorithm divided into three parts : The feature detection, characters format and characters detection Parts in order to be possible to apply to image of various feature. After preprocess that the new multi characters detection algorithm that proposed in this paper used wavelet, morphology, hough transform which is the synthesis logical model in order to raise detection rate by acquiring the non-perfection characters as well as the perfection characters with processing OR operation after processing each color area by AND operation sequentially. And the proposal algorithm is simulated with natural images which include natural character area regardless of size, resolution and slant and so on of image. And the proposal algorithm in this paper is confirmed to an excellent detection rate by compared with the conventional detection algorithm in same image.

Satellite Fault Detection and Isolation Using 2 Step IMM (2 단계 상호간섭 다중모델을 이용한 인공위성 고장 검출)

  • Lee, Jun-Han;Park, Chan-Gook;Lee, Dal-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.2
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    • pp.144-152
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    • 2011
  • This paper presents a new scheme for fault detection and isolation in the satellite system. The purpose of this paper is to develop a fault detection, isolation and diagnosis algorithm based on the bank of interacting multiple model (IMM) filter for both total and partial faults in a satellite attitude control system (ACS). In this paper, IMM are utilized for detection and diagnosis of anticipated actuator faults in a satellite ACS. Other fault detection, isolation (FDI) schemes using conventional IMM are compared with the proposed FDI scheme. The FDI procedure is developed in two stages. In the first stage, 11 EKFs actuator fault models are designed to detect wherever actuator faults occur. In the second stage of the FDI scheme, two filters are designed to identify the fault type which is either the total or partial fault. An important feature of the proposed FDI scheme can decrease fault isolation time and figure out not only fault detection and isolation but also fault type identification.

A New Receiver Combining Antenna Array Receiver and Successive Interference Cancelling Multiuser Detector in DS/CDMA Systems (DS/CDMA 시스템에서 안테나 배열 수신기와 연속 간섭 제거 다중 사용자 검출기를 결합한 새로운 수신기)

  • 유성균;곽경섭
    • Journal of Korea Multimedia Society
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    • v.5 no.5
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    • pp.582-589
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    • 2002
  • In this paper, we propose a new method that combines antenna array, which employs any beamforming algorithm, and successive interference cancelling multiuser detector which improves the performance of the receiver and analyse its performance. Antenna away receivers can improve the performance by spatially discriminating among the users and reducing the multiple access interference. But the performance of the receivers degrades when the difference of the direction of arrival of the users are too small. Many interference cancelling multiuser detectors have been suggested for DS/CDMA systems which have low complexity for their performance. In this paper, we show how to mitigate such a degradation by combining successive interference cancelling multiuser detector.

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Iterative MIMO Reception Based on Low Complexity Soft Detection (저연산 연판정 기반의 다중 안테나 반복검출 기법)

  • Shin, Sang-Sik;Choi, Ji-Woong
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.8
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    • pp.61-66
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    • 2013
  • In this paper, we propose an iterative soft dimension reduction based multi-input multi-output (MIMO) detection for coded spatial multiplexing system. In spite of better performance of iterative MIMO detection, its computational complexity gives a significant burden to the receivers. To mitigate this problem, we propose a scheme employing all ordering successive interference cancellation (AOSIC) for hard-decision detection and dimension reduction soft demodulator (DRSD) with iterative decoding for soft-decision detectors, respectively. This scheme can reduce complexity of iterative soft MIMO detection and provide better performance than other conventional detectors.

A Real-time Copper Foil Inspection System using Multi-thread (다중 스레드를 이용한 실시간 동판 검사 시스템)

  • Lee Chae-Kwang;Choi Dong-Hyuk
    • Journal of KIISE:Computing Practices and Letters
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    • v.10 no.6
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    • pp.499-506
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    • 2004
  • The copper foil surface inspection system is necessary for the factory automation and product quality. The developed system is composed of the high speed line scan camera, the image capture board and the processing computer. For the system resource utilization and real-time processing, multi-threaded architecture is introduced. There are one image capture thread, 2 or more defect detection threads, and one defect communication thread. To process the high-speed input image data, the I/O overlap is used through the double buffering. The defect is first detected by the predetermined threshold. To cope with the light irregularity, the compensation process is applied. After defect detection, defect type is classified with the defect width, eigenvalue ratio of the defect covariance matrix and gray level of defect. In experiment, for high-speed input image data, real-time processing is possible with multi -threaded architecture, and the 89.4% of the total 141 defects correctly classified.

Small Target Detection in Multi-Resolution Image Using Facet Model (다중 해상도 영상에서 페이싯 모델을 이용한 초소형 표적 검출)

  • Park, Ji-Hwan;Lee, Min-Woo;Lee, Chul-Hun;Joo, Jae-Heum;Nam, Ki-Gon
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.2
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    • pp.76-82
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    • 2011
  • In this paper, we propose the technique to detect the location and size of the small target in multi-resolution image using cubic facet model. The input image is reduced by the multi-resolution and we obtain the multi-resolution images. We apply the facet model and the local maxima conditions to the multi-resolution images of each level. And then, we detect the location of the small target. We estimate that the location at the maximum of the $D_2$ which means the local maxima value of the facet model in the multi-resolution images is the location of the small target. We can detect the small target of the various size about the multi-resolution images of each level. In this paper, we experimented in the various infrared images with the small target. The method using the typical facet model applies a mask. However, the proposed method applies a mask in the multi-resolution images. We verified to vary the mask size and differ the size of the small target. The proposed algorithm can detect the location and size of the small target.

다성 음악 신호의 주요 멜로디 검출 정확도 향상 기술

  • Yun, Je-Yeol;Song, Jae-Jong;Lee, Seok-Pil;Park, Ho-Jong
    • Broadcasting and Media Magazine
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    • v.16 no.4
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    • pp.84-92
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    • 2011
  • 다성 음악 신호의 주요 멜로디 검출 기술은 프레임 단위로 다중 피치를 검색하고 멜로디 피치를 선택하여 최종 멜로디를 검출한다. 그러나 다중 피치 검색의 한계와 피치 검색에서의 더블링(doubling)과 하빙(halving) 등으로 인하여 멜로디 피치 검출의 정확도가 저하되는 문제점을 가진다. 따라서 다성 음악의 주요 멜로디 검출 과정은 프레임 사이의 멜로디 피치를 분석하여 추가적으로 멜로디 피치를 보정하는 과정이 필요하다. 본 고에서는 다성 음악 신호에서 프레임 단위로 검출된 멜로디 피치를 보정하여 주요 멜로디 검출의 정확도를 추가로 향상시키는 기술들을 소개한다. 다양한 기술들을 접근 방식에 따라 분류하여 설명하고, 대표적인 기술의 검출 정확도 향상 성능을 간단히 정리한다.