• Journal of KIISE:Software and Applications
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• v.33 no.4
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• pp.418-426
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• 2006

This paper proposes a robust and efficient segmentation method for a cardiac ultrasound image taken from a probe inserted into the heart in surgery. The method consists of three steps: initial boundary extraction, whole boundary modification using confidence competition, and local boundary modification using the rolling spoke method. Firstly, the initial boundary is extracted with threshold regions along the global spokes emitted from the center of an ultrasound probe. Secondly, high confidence boundary edges are detected along the global spokes by competing among initial boundary candidate and new candidates achieved by edge and appearance information. finally, the boundary is modified by rolling local spokes along concave regions that are difficult to extract using the global spokes. The proposed method produces promising segmentation results for the ultrasound cardiac images acquired during surgery.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.1
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• pp.43-52
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• 2009

LIDAR data, as the source of the 3D information of buildings, are used many modeling fields such as three-dimensional city models in urban planning and the visibility analysis of buildings. This study suggests a methodology, that is characterized by combining image-based and point-based process, for minimizing the user's intervention and automatically extracting building boundary only using the LIDAR data. Image processing methodology is firstly used to separate building and non-building regions from LIDAR data. Moreover, building regions are then classified main roof into remaining parts by the statistical analysis of height values, and the remaining parts are processed separately. Through the experimental results of study areas which exist many types of buildings, for example, apartment-type, stair-type, complex-type, etc. Approximately 90% building boundaries are automatically extracted by the proposed methodology.

• Journal of Korean Society for Geospatial Information Science
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• v.21 no.4
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• pp.101-107
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• 2013

Generally the commercial high-resolution images have their coordinates, but the locations are locally different according to the pose of sensors at the acquisition time and relief displacement of terrain. Therefore, a process of image co-registration has to be applied to use the multi-temporal images together. However, co-registration is interrupted especially when images include the cloud-covered regions because of the difficulties of extracting matching points and lots of false-matched points. This paper proposes an automatic co-registration method for the cloud-covered high-resolution images. A scale-invariant feature transform (SIFT), which is one of the representative feature-based matching method, is used, and only features of the target (cloud-covered) images within a circular buffer from each feature of reference image are used for the candidate of the matching process. Study sites composed of multi-temporal KOMPSAT-2 images including cloud-covered regions were employed to apply the proposed algorithm. The result showed that the proposed method presented a higher correct-match rate than original SIFT method and acceptable registration accuracies in all sites.

• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.93-96
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• 2007

There is increasingly interested in the measurement of antenna's characteristics for one's manufacture according to one's various application. Due to this, the antenna measurement system need be made with more and more great precision. On measuring of the antenna's characteristic, the conventional system handled by human generates the error due to controlling the position of the system by user. Therefore there need be introduced the automatic measurement system of antenna's characteristic. In this paper, we propose image processing algorithm for the automatic measurement system of antenna's characteristic. The proposed algorithm gets image of the standard gain horn antenna in the chamber room, extracts an antenna object from the image, and extracts the parameters for automatic alignment of AUT(Antenna Under Test) and Probe. Also the proposed algorithm gets the error for corrects of slope and distortion of AUT junction due to weight of fitted antenna.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.38 no.5
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• pp.77-85
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• 2001

The purpose of this study is to suggest Vergence Information Extracting Algorithm(VIEA) which enables quick and accurate vergence information achievement for automation of vergence and focus control of horizontal moving stereoscopic camera. Firstly, for this purpose, the geometric structure of horizontal moving stereoscopic camera device was analyzed and linear relation between the vergence and the focus control. Then stereoscopic camera was designed and produced with the application of vergence and focus relation formula. Finally, VIEA that uses Cepstrum filter was employed to implement Automatic Vergence and Focus Controlling Stereoscopic Camera System(AVFCSCS). VIEA showed lower vergence achievement time and error ratio in comparison with existing algorithms. The suggested system in this study substantially reduced the controlling time and error-ratio as to make it possible to achieve natural and clear images. It also simplified the handling of stereoscopic camera for the convenience of end-users.

• Journal of the Korean Society for Library and Information Science
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• v.49 no.1
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• pp.443-464
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• 2015

This study examined the feasibility of using EEG signals and ERP P3b for extracting video key-frames based on users' cognitive responses. Twenty participants were used to collect EEG signals. This research found that the average amplitude of right parietal lobe is higher than that of left parietal lobe when relevant images were shown to participants; there is a significant difference between the average amplitudes of both parietal lobes. On the other hand, the average amplitude of left parietal lobe in the case of non-relevant images is lower than that in the case of relevant images. Moreover, there is no significant difference between the average amplitudes of both parietal lobes in the case of non-relevant images. Additionally, the latency of MGFP1 and channel coherence can be also used as criteria to extract key-frames.

• Journal of KIISE:Software and Applications
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• v.36 no.1
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• pp.62-69
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• 2009

The purpose of document summarization is to provide easy and quick understanding of documents by extracting summarized information from the documents produced by various application programs. In this paper, we propose a document summarization method that creates and analyzes a connection graph representing the similarity of keyword lists of sentences in a document taking into account the mean length(the number of keywords) of sentences of the document. We implemented a system that automatically generate a summary from a document using the proposed method. To evaluate the performance of the method, we used a set of 20 documents associated with their correct summaries and measured the precision, the recall and the F-measure. The experiment results show that the proposed method is more efficient compared with the existing methods.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.1-2
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• 2013

최근 다양한 모바일 디바이스의 개발 및 대중화로 인해, 사용자가 콘텐츠에 노출되는 시간이 급증하고 있다. 이와 함께, 사용자가 필요한 정보를 선택적으로 제공하기 위한 사용자 맞춤형 서비스의 개발도 많은 관심을 받고 있다. 이를 위해서는 콘텐츠가 내포하는 정보를 자동적으로 추출하여 인식하는 기술이 필수적이며, 채널 정보는 지능적 상황 인지를 위해 방송 영상이 가지는 중요한 정보 중 하나이다. 이에 본 논문은 영상 정보 기반의 채널 로고 인식 기법을 제안한다. 본 기법은 채널 로고가 포함된 동영상에서 색상 정보와 그라디언트를 추출하여 동영상 내의 각 좌표가 로고에 해당할 가능성을 의미하는 Logosity 개념을 정의한다. Logosity를 기반으로 채널 로고 후보 영역을 탐지하고, 각 로고 후보에 대해 채널 종류를 판단하는 분류를 수행한다. 실험을 통하여 제안하는 알고리즘이 다양한 채널의 영상에 대해 뛰어난 인식 및 분류 성능을 나타냄을 확인한다.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2000.04a
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• pp.387-395
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• 2000

기존의 BISAgent(Bookmark Information Sharing Agent)는 사용자에 의해 저장되는 북마크를 공유를 기반으로 협동적 웹 브라우징(Collaborative Web Browsing)을 통해 Information Overload를 해결코자 하였다. 하지만, 사용자의 북마크의 메타 정보 입력에 대한 부담은 Information Noise 발생의 원인이 되었고, 그로인한 부작용이 발생하였다. 본 연구에서는 BISAgent에 Ontology의 결합을 통해 사용자가 방문한 사이트의 내용 정보를 해석하여 개념화 하였으며, XML을 이용하여 표현하였다. 그럼으로써 북마크 메타정보의 자동화 및 북마크 자체의 자동 삽입을 통해 사용자의 부담을 최소화하는 효과를 가져왔다. 실험으로써 Ontology를 이용한 일반 HTML 문서의 개념화된 XML 문서로의 변환을 수행하였으며 북마크 정보 저장의 자동화를 위해 사이트 방문 패턴 해석을 실시하여 시스템의 성능을 평가하였다. 양적으로 많은 사용자 북마크를 추출하지는 못했지만 추출된 북마크는 사용자의 재방문이 이루어짐으로써 상당히 높은 정확성을 얻을 수 있었다.

• Annual Conference of KIPS
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• 2009.04a
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• pp.1288-1291
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• 2009

네트워크 트래픽 모니터링과 분석은 엔터프라이즈 네트워크의 효율적인 운영과 안정적 서비스를 제공하기 위한 필수적인 요소이다. 다양한 트래픽 분석 방법 중 시그니쳐 기반의 분석 방법은 가장 높은 분석률을 보이지만 모든 시그니쳐를 수작업으로 추출하기 때문에 응용프로그램의 변화와 출현에 유연하게 대응하지 못한다. 따라서 본 논문에서는 응용프로그램 시그니쳐 생성 과정의 단점을 보완할 수 있는 시그니쳐 자동 생성 시스템을 제안한다. 응용프로그램 시그니쳐는 페이로드 내의 고유한 바이트 시퀀스로 정의하며 응용프로그램이 발생시키는 모든 트래픽을 대상으로 추출한다. 또한 생성 시스템의 실효성을 증명할 수 있는 검증 시스템 및 검증 네트워크를 제시한다.