• Title/Summary/Keyword: Image chain

검색결과 222건 처리시간 0.033초

산업용 비젼 시스템을 위한 체인코더의 제작 (Development of A Hardware Chain Coder for Industrial Vision Systems)

  • 이병일;신유식;임준홍;서일홍;변증남
    • 대한전기학회논문지
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    • 제38권8호
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    • pp.629-639
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    • 1989
  • One of the major issues of the industrial vision systems is lengthy processing time due to bulky data for image coding. To reduce the processing time, a modified chain coding algorithm is proposed in such a way that it is more suitable for hardware implementation. A hardware chain coder is developed and used for learn and recognizing objects by extracting several features. It is shown that the desired vision system is much faster than a typical software based system so that it may be applicable to real-time industrial operations.

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A Bayesian Wavelet Threshold Approach for Image Denoising

  • Ahn, Yun-Kee;Park, Il-Su;Rhee, Sung-Suk
    • Communications for Statistical Applications and Methods
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    • 제8권1호
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    • pp.109-115
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    • 2001
  • Wavelet coefficients are known to have decorrelating properties, since wavelet is orthonormal transformation. but empirically, those wavelet coefficients of images, like edges, are not statistically independent. Jansen and Bultheel(1999) developed the empirical Bayes approach to improve the classical threshold algorithm using local characterization in Markov random field. They consider the clustering of significant wavelet coefficients with uniform distribution. In this paper, we developed wavelet thresholding algorithm using Laplacian distribution which is more realistic model.

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체인 코드 트리밍과 가중 원형 정합을 이용한 인쇄체 숫자 인식 (Machine-printed Numeral Recognition using Weighted Template Matching with Chain Code Trimming)

  • 정민철
    • 지능정보연구
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    • 제13권4호
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    • pp.35-44
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    • 2007
  • 본 논문에서는 인쇄체 숫자를 인식하기 위해 가중 원형 정합(weighted template matching) 방법을 제안한다. 원형 정합은 입력 영상 전체를 하나의 전역적인 특징으로 처리하는데 반해, 제안된 가중 원형 정합은 패턴의 특징이 나타나는 국부적인 영역에 해밍 거리(Hamming distance)의 가중치를 두어 패턴 특징을 강조하여 숫자 패턴의 인식률을 높인다. 또한 원형 정합은 영상을 이진화(binarization)할 때 발생되는 패턴의 윤곽선을 울퉁불퉁하게 만드는 랜덤 노이즈에 취약하다. 이러한 랜덤 노이즈를 제거하기 위해 본 논문에서는 체인 코드 트리밍(chain code trimming)방법을 제안한다. 체인 코드 트리밍은 패턴의 외부 윤곽선과 내부 윤곽선의 체인 코드 분석을 통해 특정 유형의 체인 코드를 제거, 교정함으로써 이루어진다. 실험에서는 기존의 원형 정합을 사용했을 때와 체인 코드 트리밍을 한 후 가중 원형 정합을 사용했을 때의 혼돈 행렬(confusion matrix)을 서로 비교한다. 실험 결과는 본 논문에서 제안한 방법에 의해 인쇄체 숫자의 인식률이 크게 향상된 것을 보인다.

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Efficient CT Image Segmentation Algorithm Using both Spatial and Temporal Information

  • Lee, Sang-Bock;Lee, Jun-Haeng;Lee, Samyol
    • 한국콘텐츠학회:학술대회논문집
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    • 한국콘텐츠학회 2004년도 추계 종합학술대회 논문집
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    • pp.505-510
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    • 2004
  • This paper suggests a new CT-image segmentation algorithm. This algorithm uses morphological filters and the watershed algorithms. The proposed CT-image segmentation algorithm consists of six parts: preprocessing, image simplification, feature extraction, decision making, region merging, and postprocessing. By combining spatial and temporal information, we can get more accurate segmentation results. The simulation results illustrate not only the segmentation results of the conventional scheme but also the results of the proposed scheme; this comparison illustrates the efficacy of the proposed technique. Furthermore, we compare the various medical images of the structuring elements. Indeed, to illustrate the improvement of coding efficiency in postprocessing, we use differential chain coding for the shape coding of results.

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The Analysis of Information Transfer Efficiency in Medical Image Display

  • 김종효;민병구;한만청;이충웅
    • 대한의용생체공학회:학술대회논문집
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    • 대한의용생체공학회 1992년도 춘계학술대회
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    • pp.55-57
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    • 1992
  • Image display is the last step of imaging chain in which the diagnostic information is transformed into perceivable intensities and transformed to observer's eye-brain system. In this process, a certain part of information may be efficiently transfered and another part may be inefficiently transfered leading to information loss. In this study, the visual perceptual properties of image display on CRT monitor has been investigated. Psychophysical experiment of target image detection has been performed using CRT monitor for various background grey levels, and the threshold difference grey levels required for visual discrimination have been predicted by computer simulation with visual model.

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제한된 문서 영상에서 패턴 분절과 구분 처리에 관한 연구 (A Study on the Pattern Segmentation and Classification in Specially Documentated Imaged)

  • 옥철호;허도근;진용옥
    • 한국통신학회논문지
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    • 제14권6호
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    • pp.663-674
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    • 1989
  • 본 논문은 문서자동 처리시스템의 구현을 위하여 문서영상의 패턴 분절과 구분처리 방법에 대하여 기술하였다. 가우스 분포함수의 1차 미분 연산자에 의한 윤곽선 추출과 체인 코드법에 의한 영상 분절, 2차 적률과 2차원 Rf 거리 (변환 영역)등에 의한 패턴 구분을 행하였다. 제한된 영상에 대하여 적용한 결과 문자 영역이나 지문, 사진, 도장 등 도형정보 영역을 잘 구분할 수 있음을 알았으며 사용된 알고리즘의 유용성을 검증할 수 있었다.

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웹 카메라에서 블록정합기법을 이용한 헤어커팅 포인트 분석 및 개선 (Haircutting Point Analysis and Improvement the Block Matching Algorithm Using in Web Camera)

  • 강남순
    • 디지털산업정보학회논문지
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    • 제5권4호
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    • pp.189-197
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    • 2009
  • This paper suggests the system for searching and application is to be in combination between existing hair art area and Image/Video processing area. This proposed system usually saves various hair types into a database, then, users send images of their face over the internet by using WebCam. Finally, they can find the hair types for users. Hair cutting is technology that form draft to make hair style. Man cut must decide how in image of sinciput, image of side bean curd, after lower image must operate. Silhouette is produced as is different by change of this three places. Customer increases in the beauty salon and beauty salon chain being changed, research about beauty art is necessary point of time. In this treatise, our country of when swim and operate haircut about problem that happen sample survey and analysis.

형태분석에 의한 특징 추출과 BP알고리즘을 이용한 정면 얼굴 인식 (Full face recognition using the feature extracted gy shape analyzing and the back-propagation algorithm)

  • 최동선;이주신
    • 전자공학회논문지B
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    • 제33B권10호
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    • pp.63-71
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    • 1996
  • This paper proposes a method which analyzes facial shape and extracts positions of eyes regardless of the tilt and the size of input iamge. With the extracted feature parameters of facial element by the method, full human faces are recognized by a neural network which BP algorithm is applied on. Input image is changed into binary codes, and then labelled. Area, circumference, and circular degree of the labelled binary image are obtained by using chain code and defined as feature parameters of face image. We first extract two eyes from the similarity and distance of feature parameter of each facial element, and then input face image is corrected by standardizing on two extracted eyes. After a mask is genrated line historgram is applied to finding the feature points of facial elements. Distances and angles between the feature points are used as parameters to recognize full face. To show the validity learning algorithm. We confirmed that the proposed algorithm shows 100% recognition rate on both learned and non-learned data for 20 persons.

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멀티모달 정보변환을 통한 시각장애우 보행 보조 시스템 (Walking Assistance System for Sight Impaired People Based on a Multimodal Information Transformation Technique)

  • 유재형;한영준;한헌수
    • 제어로봇시스템학회논문지
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    • 제15권5호
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    • pp.465-472
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    • 2009
  • This paper proposes a multimodal information transformation system that converts the image information to the voice information to provide the sight impaired people with walking area and obstacles, which are extracted by an acquired image from a single CCD camera. Using a chain-code line detection algorithm, the walking area is found from the vanishing point and boundary of a sidewalk on the edge image. And obstacles are detected by Gabor filter of extracting vertical lines on the walking area. The proposed system expresses the voice information of pre-defined sentences, consisting of template words which mean walking area and obstacles. The multi-modal information transformation system serves the useful voice information to the sight impaired that intend to reach their destination. The experiments of the proposed algorithm has been implemented on the indoor and outdoor environments, and verified its superiority to exactly provide walking parameters sentences.

JERS-1 OPS영상의 줄무늬 현상 제거 알고리즘 (Elimination of JERS-1 OPS Image Striping Effect)

  • 신동석;이영란
    • 대한원격탐사학회지
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    • 제14권1호
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    • pp.95-101
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    • 1998
  • 본 논문에서는 일본 지구관측 위성인 JERS-1의 광학 센서 (OPS) 영상에 나타나는 줄무늬를 제거하기 위해 개발된 알고리즘에 대해서 기술한다. 개발된 알고리즘은 주위의 화소 값을 사용하는 공간 또는 주파수 대역의 필터링 기술과는 달리 영상 각 줄의 평균 값을 사용하는 통계적 방법을 사용하기 때문에 영상의 방사학적 성질을 변화시키지 않는다. 개발된 알고리즘은 인공위성연구센터 위성영상 직수신국의 터리 단계의 일부로 삽입되어 사용자에게 줄무늬 효과를 크게 줄인 OPS 영상을 제공하는데 도움을 줄 것이다.