• Title/Summary/Keyword: Enhanced Direction

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Fingerprint Identification System Using Ridge Direction Extraction by Index Table (Index table에 의한 융선의 방향성 추출을 이용한 지문 인식 시스템)

  • Lee, Jee-Won;Ahn, Do-Rang;Lee, Dong-Wook
    • Proceedings of the KIEE Conference
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    • 2005.10b
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    • pp.180-182
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    • 2005
  • Fingerprint-based identification is known to be used for a very long time. Owing to their uniqueness and immutability, fingerprints are today the most widely used biometric features. Therefore, recognition using fingerprints is one of the safest methods as a way of personal identification. But fingerprint identification system has a critical weakness. Since the fingerprint identification time dramatically increase when we compare the unknown fingerprint's minutiae with fingerprint database's minutiae. In this paper, a ridge orientation extraction method using Index table is proposed to solve the problem. The goal of fast direction image extraction is to reduce the identification time and to improve the clarity of ridge and valley structures of input fingerprint image.

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Fingerprint Verification System Using Improved Preprocessing (개선된 전처리 과정을 이용한 지문 인식 시스템)

  • Lee Dong-Wook;Ahn Do-Rang;Lee Jee-Won
    • Journal of the Institute of Convergence Signal Processing
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    • v.7 no.2
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    • pp.73-80
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    • 2006
  • Fingerprint-based verification system has been used for a very long time. Because of their well-known uniqueness and immutability, fingerprint is one of the most widely used biometric features. However, fingerprint identification system has such a critical weakness that the performance of verification is reduced drastically for a poor input fingerprint. In this paper, an image enhancement algorithm using enhanced direction and enhanced binary and aiming image is used to mitigate the problem in the preprocessing. The goal of image enhancement is to estimate the quality of input fingerprint image and to improve the clarity of ridge and valley structures of input fingerprint image. Also, a ridge orientation extraction method using index table is proposed to improve the speed of verification. It is shown by the experiments that proposed fingerprint verification system improves the minutiae extraction accuracy and performance of verification.

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A Study on the Accuracy Enhancement Using the Direction Finding Process Improvement of Ground-Based Electronic Warfare System (지상용 전자전장비의 방향 탐지 프로세스 개선을 통한 정확도 향상에 관한 연구)

  • Chin, Huicheol;Kim, Seung-Woo;Choi, Jae-In;Lee, Jae-Min
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.6
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    • pp.627-635
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    • 2017
  • Modern warfare is gradually changing into a network war, and information electronic warfare is also progressing. In modern war, electronic warfare is all military activity concerned with electromagnetic field use, such as signal collecting, communication monitoring, information analysis, and electronic attack. The one key function of signal collecting for enemy signal analysis, direction finding, collects the signal radiated from enemy area and then calculates the enemy direction. This paper examined the Watson-Watt algorithm for an amplitude direction finding system and CVDF algorithm for phase direction finding system and analyzed the difference in the direction finding accuracy between in the clean electromagnetic field environment and in the real operating field environment of electronic warfare system. In the real field, the direction finding accuracy was affected by the reflected field from the surrounding obstacles. Therefore, this paper proposesan enhanced direction finding process for reducing the effect. The result of direction finding by applying the proposed process was enhanced above $1.24^{\circ}$ compared to the result for the existing process.