• Title/Summary/Keyword: optical pattern recognition

검색결과 111건 처리시간 0.025초

Color Pattern Recognition with Recombined Single Input Channel Joint Transform Correlator

  • Jeong, Man-Ho
    • Journal of the Optical Society of Korea
    • /
    • 제15권2호
    • /
    • pp.140-145
    • /
    • 2011
  • Joint transform correlator (JTC) is a well known tool for color pattern recognition for a color image. Color images have red, green and blue components, thus in conventional JTC, three input channels of these color components are necessary for color pattern recognition. This paper proposes a new technique of color pattern recognition by decomposing the color image into three color components and recombining those components into a single gray image in the input plane. This new technique needs single input channel and single output CCD camera, thus a simple JTC can be used. We present various kinds of simulated results to show that our newly proposed technique can accurately recognize and discriminate color differences.

전방위카메라를 이용한 이동로봇에서의 이동물체 인식 (Recognition of Moving Objects in Mobile Robot with an Omnidirectional Camera)

  • 김종철;김영명
    • 로봇학회논문지
    • /
    • 제3권2호
    • /
    • pp.91-98
    • /
    • 2008
  • This paper describes the recognition method of moving objects in mobile robot with an omnidirectional camera. The moving object is detected using the specific pattern of an optical flow in omnidirectional image. This paper consists of two parts. In the first part, the pattern of an optical flow is investigated in omnidirectional image. The optical flow in omnidirectional image is influenced on the geometry characteristic of an omnidirectional camera. The pattern of an optical flow is theoretically and experimentally investigated. In the second part, the detection of moving objects is presented from the estimated optical flow. The moving object is extracted through the relative evaluation of optical flows which is derived from the pattern of optical flow. In particular, Focus-Of-Expansion (FOE) and Focus-Of-Contraction (FOC) vectors are defined from the estimated optical flow. They are used as reference vectors for the relative evaluation of optical flows. The proposed algorithm is performed in four motions of a mobile robot such as straight forward, left turn, right turn and rotation. Experimental results using real movie show the effectiveness of the proposed method.

  • PDF

Coded Single Input Channel for Color Pattern Recognition in Joint Transform Correlator

  • Jeong, Man-Ho
    • Journal of the Optical Society of Korea
    • /
    • 제15권4호
    • /
    • pp.335-339
    • /
    • 2011
  • Recently, we reported a single input channel joint transform correlator for the color pattern recognition which decomposes the input color image into three R, G, and B gray components and adds those components into a single gray image in the input plane. This technique has the merit of a single input channel instead of three input channels. However, we found this technique has some problems with discrimination impossibility in the case of a simple primary color pattern which results in the same gray level through the addition process. Thus, we propose a modified coding technique which selectively recombines the decomposed three R, G, and B gray components instead of the simple adding process. Simulated results show that the modified coding technique can accurately discriminate a variety of kinds of color images.

홀로그램 연상기억을 이용한 광학적 영상인식에 관한 연구 (Optical Pattern Recognition Based on Holographic Associative Memory)

  • 서호형;김병윤;이상수
    • 한국광학회:학술대회논문집
    • /
    • 한국광학회 1991년도 광학 및 양자전자학 워크샵
    • /
    • pp.33-39
    • /
    • 1991
  • We have developed a new holographic associative memory(HAN) based on an adaptive learning which uses learning pattern method (LPM). The LPM utilizes the simple optical implementation of outer-product learning, performance of adapitive learning. simulation are represented.

  • PDF

Perceptron 신경회로망에 근거한 광 패턴인식 시스템의 구현 (Implementation of Optical Pattern Recognition System Based on Perceptron Neural Network)

  • 한종욱;용상순;이진호;이기서;김은수
    • 한국통신학회논문지
    • /
    • 제16권6호
    • /
    • pp.545-555
    • /
    • 1991
  • 본 논문에서는 단층 퍼센트론 모델의 학습기능과 신경회로망 형성메모리의 오류정정 능력이 서로 보완적으로 결합된 새로운 적응 패턴인식 시스템의 광학적구현을 실현하였다. 여기서, 단층 퍼센트론 모델은 2차원 LCTV 공간 광변조기를 이용하여 편광인코딩방법과 비전형 양자화 방법으로 구현하였으며, Hopfield 연장메모리는 2차원 모델로 황장하고multifocus holoens를 이용하여 광학적으로 구현하였다. 아리비아 숫자 짝.홀수 판별에 고나한 광학적 실험 결과, 오류 및 부분 입력에 대한 정확한 패턴 분류가 됨을 확인함으로서, 본 논문에서 제시한 새로운 적응 광 패턴인식 시스템이 실제로 영상처리, 패턴인식 등의 분야에서 그 응용 가능성을 제시하였다.

  • PDF

방향선소와 고유벡터 특징을 이용한 전기광학적 패턴인식 시스템 (Electrooptic pattern recognition system by the use of line-orientation and eigenvector features)

  • 신동학;장주석
    • 한국광학회지
    • /
    • 제8권5호
    • /
    • pp.403-409
    • /
    • 1997
  • 다양한 특징들을 광학적으로 병렬추출하여 패턴인식을 수행하는 시스템을 제안하고 실험하였다. 추출하려는 특징은 6개의 방향선소들 및 선소특징만으로 구별되지 않는 패턴들에 대한 공분산행렬의 고유벡터들이다. 이 시스템은 크게 특징추출부와 패턴인식부로 구성된다. 전자는 여러 특징을 병렬적으로 추출하기 위해 다중 Vander Lugt 필터를 사용하여 광학적으로 구현되었으며, 후자는 이들 추출된 특징들을 사용하여 패턴인식이 수행되도록 컴퓨터에서 구현되었다. 패턴인식 방법으로는, 추출된 특징을 인공신경망에 학습을 시키는 방법과 단순히 선소들의 논리적인 개수를 사용하는 방법, 두 가지가 각각 사용되었다. 여기서는 선소들로만 구성된 15개의 영문자 패턴들에 대해 실험하였고 그 실험결과를 보고한다.

  • PDF