• Digital Contents
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• no.2 s.9
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• pp.47-55
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• 1994

센터내 DB표준화분과위원회 DB검색표준 실무작업반은 지난 93년도 하반기에 데이터베이스 검색표준화를 위한 연구를 수행했다. 그간 실무작업반에서는 국내외 대표적인 데이터베이스 유통업체들과 국외의 데이터베이스 유통업체들이 제공하는 서비스의 접속방법, 검색명령어, 검색화면 등을 조사 비교하고 분석된 결과를 사용자 요구사항을 바탕으로 데이터베이스 검색명령어의 표준을 마련했는데 본지에서는 연구결과를 중심으로 그 내용을 정리, 요약한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.296-299
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• 2013

디스플레이 기술이 발전함에 따라 다양한 크기의 디스플레이를 탑재한 장치들이 등장하게 되었고, 다양한 디스플레이 크기만큼 다양한 해상도를 사용하고 있다. 때문에 비디오 코덱과 scaler는 보편적으로 함께 사용된다. 그러나 기존의 scaler는 비디오 코덱의 복호화기와 화면 해상도 변환 모듈이 독립적으로 구성되고, 서로 간에 정보를 이용하지 않으므로 시스템의 성능 개선에 한계가 존재하였다. 즉, 비디오 코덱의 복호화기는 비트스트림으로부터 복호한 정보를 바탕으로 영상을 복원하고, 복원영상은 up/down scaler에서 확대/축소를 수행한다. 하지만 비디오 코덱의 비트스트림에 존재하는 정보는 영상의 특성을 반영하기 때문에 up/down scaler에서 비디오 코덱의 복호화기에서 복호된 정보를 이용하면 복잡도의 증가 없이 효율적인 확대/축소를 수행할 수 있다. 이에 본 논문에서는 비디오 코덱 중 차세대 비디오 코덱인 H.264/AVC 복호화기에서 생성된 복원 영상에 대해서 별도로 영상의 특성을 계산하는 모듈 없이 H.264/AVC 복호화기에서 복원된 정보 중 인트라 모드 정보를 바탕으로 영상의 특성에 맞는 up/down scaler를 구현하는 방법을 제안한다. 이 방법은 기존의 scaler들보다 물체의 경계영역을 더 선명하게 확대하는 효과를 보인다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.1-5
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• 2020

최근 MPEG-I 그룹에서는 표준화가 진행중인 몰입형 미디어(Immersive Media)에 대한 압축 성능 탐색이 이루어지고 있다. 몰입형 비디오는 다수의 시점 영상과 깊이 맵을 통한 깊이 맵 기반 이미지 렌더링(DIBR)을 바탕으로 제한적 6DoF 을 제공하고자 하는 기술이다. 현재 MIV(Model for Immersive Video) 기술에서는 바탕 시점(Basic View)과 각 시점의 고유한 영상 정보를 패치 단위로 모아둔 추가 시점(Additional View)으로 처리하는 모델을 채택하고 있다. 그 중에서 추가 시점은 일반적인 영상과는 달리 시간적/공간적 상관성이 떨어지는 분절적인 형태로 이루어져 있어 비디오 인코더에 대해 최적화가 되어 있지 않으며, 처리 방법의 특성에 따라 자기 유사적인 형태를 지니게 된다. 따라서 MIV 에서 스크린 콘텐츠 코딩 성능과 함께 화면 내 블록 카피(IBC: intra block copy) 기술에 대한 성능을 분석 결과를 제시한다. IBC 미적용 대비 최대 7.56%의 Y-PSNR BD-rate 감소가 가능함을 확인하였으며, 영상의 특성에 따라 IBC 의 선택 비율을 확인하여 추가 시점의 효율적인 압축 형태를 고찰한다.

• Archives of design research
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• v.18 no.1 s.59
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• pp.263-272
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• 2005

The layout in picture book is a visual statement that arouses children's psychological reaction upon pictorial positions and those disposition, and that indicates a correlation between theme and background and characters' movements. This study firstly confirmed that children's perception and experience are variously formed according to age, past experience, psychological action, physiological impulse, mentality, growth environment, etc., in order to analyze how the pictorial layout in children's picture book has influence on children visually and psychologically. Likewise, visual and psychological perception was carried out targeting on the children between 4 and 7 years old, based on the perceptive specific and process that have been studied by previous researchers. In addition, the children's picture books published overseas or domestically were presented as the related cases, in order that the facts analyzed may be drawn to harmonious and effective pictorial layout. Lastly, it is expected that the conclusion suggested by this study may be of help to illustrators to design picture books individually and creatively, as well as be applied to studying effective expression in the educant who learn about illustration.

• Journal of the Korea Society of Computer and Information
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• v.16 no.5
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• pp.127-134
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• 2011

A finite state machine was designed to control user's gaze on the screen when the user is monitoring the. It consists of a set of situations where pupils are gazed and a set of states which decide the gaze on a screen or sleeping. The states were especially classified into main states, pre-states and potential states. The machine uses the situation history, which decide current state using continuous previous situation and current situation, and improves the accuracy to control the gaze on a screen. We implemented the machine with the data which were get using a pupil detection method, and tested the verification of the system with monitoring operations. The experimentation using the method which get date from real images shows advantage of decision whether it is temporary gaze or long-term gaze.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2000.05a
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• pp.107-111
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• 2000

There are many recent menial manufacturing firms not equipped with automatic checking system in their final process. And the check is based on the human perception so the automatic checking system is needed for the consistency and the accuracy of the checking process to elevate the productivity and the Quality. As the performance of computer systems and the vision systems has been increased the cost for the system is reduced and their applicable algorithms have been developed. In this study we develop monitor checking system which is low-cost, fast, and easy to adopt by the small-scaled manufacturing firms. The system is based on the computer vision techniques, and is equipped with the GUI interface and checking functions such as centering, yoke rotation, pincushion. sizing. Monitor checking system developed in this study can be used in the final checking process thereby we expect the synergy effects both on the efficiency of production and on the reduction of the cost for the facility investments.

• Journal of Korea Society of Industrial Information Systems
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• v.5 no.3
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• pp.111-116
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• 2000

There are many recent monitor manufacturing firms not equipped with automatic checking system in their final process. And the check is based on the human perception, so the automatic checking system is needed for the consistency and the accuracy of the checking process to elevate the productivity and the quality. As the performance of computer systems and the vision systems has been increased, the cost for the system is reduced and their applicable algorithms have been developed. In this study we develop monitor checking system which is low-cost, fast, and easy to adopt by the small-scaled manufacturing films. The system is based on the computer vision techniques, and is equipped with the GUI interface and checking functions such as centering, yoke rotation, pincushion, sizing, brightness, and grayscale tracking. Monitor checking system developed in this study can be used in the final checking process thereby we expect the synergy effects both on the efficiency of production and on the reduction of the cost for the facility investments.

• Journal of Broadcast Engineering
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• v.13 no.2
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• pp.200-213
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• 2008

H.264| MPEG-4 AVC is a new video codingstandard defined by JVT (Joint Video Team) which consists of ITU-T and ISO/IEC. Many techniques are adopted fur the compression efficiency: Especially, an intra prediction in an inter frame is one example but it leads to excessive amount of encoding time due to the decision of a candidate mode and a RDcost calculation. For this reason, a fast determination of the best intra prediction mode is the main issue for saving the encoding time. In this paper, by using the result of statistical relation between intra $16{\times}16$ and $4{\times}4$ intra predictions, the number of candidate modes for $4{\times}4$ intra prediction is reduced. Firstly, utilizing motion vector obtained after inter prediction, prediction of a block mode for each macroblock is made. If an intra prediction is needed, the correlation table between $16{\times}16$ and $4{\times}4$ intra predicted modes is created using the probability during each I frame-coding process. Secondly, using this result, the candidate modes for a $4{\times}4$ intra prediction that reaches a predefined specific probability value are only considered in the same GOP For the experiments, JM11.0, the reference software of H.264|MPEG-4 AVC is used and the experimental results show that the encoding time could be reduced by 51.24% in maximum with negligible amounts of PSNR drop and bitrate increase.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.544-546
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• 2018

하나의 애플리케이션은 기업의 업무를 분석하여 어떻게 만들지 설계를 하고, 설계를 바탕으로 설계의 내용을 그대로 개발로 구현하게 된다. 설계의 내용을 그대로 개발로 반영하기 위해 소스코드에 대한 설계도 이루어져야 한다. 다양한 방법에 대해 연구되어 왔지만, 경험기반의 설계가 반영되어 설계자 및 개발자 간에 의사소통의 오류가 발생하고, 미경험자가 설계절차를 수행하기에는 어려움이 존재한다. 이를 해결하기 위해 본 연구에서는 분석된 업무를 바탕으로 정의된 화면설계를 바탕으로 클래스로 변환되는 절차를 제안하여 초심자가 효율적으로 설계절차를 수행할 수 있을것이며, 개발자 간에 원활한 의사소통이 이루어질 것이라 기대한다.

• Journal of Broadcast Engineering
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• v.23 no.1
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• pp.126-137
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• 2018

Visual characters used in television affect the viewers in a different way from printed media. This paper analyzed the visual characters presented in each home shopping channel and their year-by-year characteristics in terms of layouts. Based on the results, the readability was analyzed according to different layouts, suggesting optimal layouts that allows for better communication with the viewers. The purpose of this study is thus to focus on the visual character layouts, which have not been fully explored to date, in order to identify the most effective one among basic locations of visual characters. The results indicate that the bottom location shows higher readability than top. The right side showed higher preference than left, while readability did not demonstrate a significant difference. As for the L-bar and reverse L-bar, the L-bar arrangement was shown preferable in terms of readability. Finally, the layout should be determined considering the readability by location.