• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.244-246
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• 2004

Compared with other transport means, safety and timeliness are the merits of railways. Unexpectedly when accident happens, much time and human strength are required to cope with the accident. And for swift recovery, systematic rehabilitation is needed. Recently using MTS(Moving picture Transmission System), we can perform accident rehabilitation and recording work efficiently. MTS is the device that transmits continuous picture information from accident field to control center. We are developing the appropriate system to railway situation to make use of the existing information communication technology, processing technology of video-tex, super high speed transmission technology through fiber-optic, copper cable and network description of information Technology, etc. If these communication-based can technologies are applied to railway system, railway managers can control the accident by inspecting the picture of accident field and can contribute to the safe train operation and the improvement of railway management. In this paper, we investigate the connecting methods when optical fiber is used for moving picture data transmission of train accidents, and its problems. And, we validate MTS's performance through about 28km section of field test.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.275-277
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• 2007

Recent activation of DMB has enabled various high quality video, audio and data services. And there are various user facilities functions using digital data transmission. One of the various user facilities functions is EPG(Electronic Program Guide). EPG supports schedule of programs on screen for. audiences. EPG is composed to time, title, channel, genre etc. Users can select a program what they want to browsing. Currently EPG services are displaying program schedule on screen visually and make users to input ke:ywords with keypads, remote control devices or touch screen etc. However, this approach could cause a serious restriction to some users like to drivers or visually handicapped persons. A standard for a voice EPG to T-DMB is proposed. This method must be transferred VoiceXML based EPG files from the transmitter to receivers. This approach has a problem to process a standardization because the transmitter and receivers should be modified. We proposed and implemented a voice EPG platform that generates the voice EPG files from T-DMB SI without transferring voice EPG file from the transmitter.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.11a
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• pp.77-80
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• 2014

멀티미디어 기술의 보급 확산 및 급속한 발전으로 새로운 영상 압축 기술인 HEVC(High Efficiency Video Coding) 고화질 영상 압축 표준을 탄생시켰으며, 사용자 또한 대형 화면에 대한 선호도가 높아지고 있다. 그 결과 기존의 HD급 영상보다 4배 이상, 16배까지 선명한 초고화질 UHD(Ultra High Definition) 영상 서비스가 차세대 방송기술로 새롭게 주목받고 있다. 또한 JPEG 2000 압축도 기존 처리된 $4096{\times}4096$ 픽셀 이미지를 넘어 초고화질 해상도 이미지(8K : $7680{\times}4320$ 혹은 $8192{\times}4320$ 픽셀)를 처리 지원을 하고 있다. 따라서 초고화질 이미지의 획득 및 저장을 위해서는 고속의 처리 기술이 필요하다. 이에 본 논문은 초고화질 해상도 이미지의 고속 처리를 위한 병렬처리 기술에 대해 단계적 연구를 실행하며, 이를 위하여 1차적으로. JPEG 2000의 처리 과정을 살펴보고 전처리 단계인 색공간 변환 알고리즘 적용을 위하여 사용자 정의의 쓰레드 기반 고속처리를 수행하였다. 실험 결과 기존의 처리보다 사용자 정의 기반 쓰레드 고속처리가 초고화질 해상도 이미지(UHD 8K : $7680{\times}4320$)를 기준으로 최대 15배의 성능 향상의 결과를 보여주었다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.96-97
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• 2015

본 논문에서는 MLT 멀티미디어 프레임워크를 이용하여 홍보동영상을 자동 합성하는 웹 기반 서비스 프레임워크 상에서의 연동 인터페이스를 개발한다. 소상공인 홍보영상 제작시스템은 일반 소상공인들의 업종 정보와 잠재고객 특성정보를 기반으로 사진이나 동영상을 입력하면 관련된 홍보동영상을 자동으로 출력하는 시스템이다. 인지도가 높고 기능이 다양한 상용 소프트웨어들이 다수 존재하지만 소상공인들이 쉽고 저렴하게 사용할 수 있는 시스템 구성을 위해 본 논문에서는 공개소스 프로젝트인 MLT 멀티미디어 프레임워크를 사용한다. LGPL에 따라 개발 중인 MLT는 멀티미디어 콘텐츠들을 쉽게 조합하고 표시하는 필수 기능들을 제공하며 플러그인 구조를 채용하여 신규기능 탑재 및 효과추가도 가능하다. 하지만 MLT는 영상생성에 필요한 저수준 기능들을 주로 제공하므로 상위 계층에서 입력된 정보를 반영하여 홍보영상을 만드는 시스템 구성을 위해서는 상위 모듈들과의 연동 인터페이스의 설계 및 구현이 필요하다. 따라서 본 논문에서는 홍보전략 및 홍보의도와 같은 상위수준의 정보를 고려하여 MLT로 동영상을 실제 합성할 수 있도록 하는 계층화된 연동 구조를 제안한다.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1053-1056
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• 2008

An application of CSG (Constructive Solid Geometry) modeling technique in Machining Simulation is introduced in this paper. The current CSG model is based on z-buffer CSG Rendering Algorithm. In order to build a CSG model, frame buffers of VGA (Video Graphic Accelerator) should be used in term of color buffer, depth buffer, and stencil buffer. In addition to using CSG model in machine simulation Stock and Cutter Swept Surface (CSS) should be solid. Method to create a solid Cuboid stock and Ball-end mill CSS are included in the present paper. Boolean operations are used to produce the after-cut part, especially the Difference operation between Stock and CSS as the cutter remove materials form stock. Finally, a small program called MaSim which simulates one simple cut using this method was created.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.580-584
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• 2005

One of the problems of panoramic image stitching methods is that its computational cost is so high that the image processing required usually cannot be done in real-time. Real-time performance is important in applications such as video surveillance becausewe must see current scenes. But it takes more than several seconds to calculate transform coefficients between images. Panoramic VR technologies such as Apple QuickTime VR have problem that distorts images of top and bottom. This paper presents a fast stitching method and a methpd reducing distortions of top and bottom in cubic panoramic image.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.236-238
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• 2003

Human face detection is often the first step in applications such as video surveillance, human computer interface, fare recognition, and image database management. We have constructed a simple and fast system to detect frontal human faces in complex environment and different illumination. This paper presents a fast segmentation method to combine neighboring pixels with similar hue. The algorithm constructs eye, mouth, and boundary maps for verifying each fare candidate. We test the system on images in complex environment and with confusing objects. The experiment shows a robust detection result with few false detected fates.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.108-111
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• 2008

In this paper, we propose an advanced hardware architecture for the CAVLC entropy encoder engine for real time Full HD video compression. Since there are 384 data coefficients which are sum of 376 AC coefficient and 8 DC coefficient per one macroblock, 384 coefficient have to be processed per one macroblock in worst case for real time processing. We propose an novel architecture which includes parallel architecture and pipeline processing, and reduction "0" in AC/DC coefficient table. To verify the proposed architecture, we develop the reference C for CAVLC and verified the designed circuit with the test vector from reference C code.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.532-535
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• 2008

The requirement of Digital Culture Content(Movie, Music, Animation, Digital TV, Exhibition and etc.) is increasing so variety and quantity of content is also increasing. The Movie what majority of the digital Content is developing of technology and data. In the result, the efficient retrieval service has required and user want to use a recommendation engine and semantic retrieval methods through the recommendation system. Therefore, this paper will suggest analysing trait element of digital content data, building of retrieval technology, analysing and retrieval technology base on KANSEI vocabulary and etc. For the these, we made a extraction technology of trait element based on semantics and KANSEI processing algorithm based on color information.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.346-350
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• 2009

Digital Multimedia Broadcasting (DMB) is the mobile TV service based on a digital radio transmission system that provides high quality audio/video and other auxiliary data services. As users want to store the DMB content in their device to be consumed later or to be shared among users, a standardized format needs to be specified to guarantee the interoperability for the DMB contents for various devices. DMB AF (Application Format) specification defines a file format for DMB contents and services. It specifies how to combine the variety of DMB contents with associated information for a presentation in a well-defined format that facilitates storage, interchange, management, editing, and presentation of the DMB contents in protected, governed, and interoperable ways. In this paper we present our implementation of DMB AF as part of the development of DMB AF reference software. Our implementation of DMB AF is developed as the reference software for the standard specification that consists of a three applications: packager, media player, metadata browser and collection of supporting libraries used by the applications.