• Proceedings of the IEEK Conference
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• 2003.11a
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• pp.279-282
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• 2003

Terrestrial DMB(Digital Multimedia Broadcasting) system is the standard that offers multimedia broadcasting services at mobile environment and is based on Eureka-147 DAB(Digital Audio Broadcasting) for transmission method. Also DMB provides the error protection method of convolution coding. In this paper, we study on the effective error resilience coding of MPEG-4 video stream over DMB system. To accomplish error resilience, we first partition one data into several data using the data partitioning, and we control the coding rate of the convolution coding according to the importance of the partitioned data. In this algorithm, we suggest and analyze the efficient rate control algorithm considering convolution code rate.

• Journal of Korea Multimedia Society
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• v.12 no.4
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• pp.492-501
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• 2009

Information on movement of objects in videos can be used as an important part in categorizing and separating the contents of a scene. This paper is proposing a shape-based movement-matching algorithm to effectively find the movement of an object in video streams. Information on object movement is extracted from the object boundaries from the input video frames becoming expressed in continuous 2D shape information while individual 2D shape information is converted into a lD shape feature using the shape descriptor. Object movement in video can be found as simply as searching for a word in a text without a separate movement segmentation process using the sequence of the shape descriptor listed according to order. The performance comparison results with the MPEG-7 shape variation descriptor showed that the proposed method can effectively express the movement information of the object and can be applied to movement search and analysis applications.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.12
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• pp.673-681
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• 2004

As the use of digital videos is getting popular, there is an increasing demand for efficient browsing and retrieval of video. To support such operations, effective video indexing should be incorporated. One of the most fundamental steps in video indexing is to parse video stream into shots and scenes. Generally, it takes long time to parse a video due to the huge amount of computation in a traditional single computing environment. Previous studies had widely used Round Robin scheduling which basically allocates tasks to each slave for a time interval of one quantum. This scheduling is difficult to adapt in a heterogeneous environment. In this paper, we propose two different parallel parsing algorithms which are Size-Adaptive Round Robin and Dynamic Size-Adaptive Round Robin for the heterogeneous distributed computing environments. In order to show their performance, we perform several experiments and show some of the results.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.165-171
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• 2005

we can define the procedure of Authoring that it makes area cord and the reproduction prevent menu programmed into MPEG II video stream , Audio which is AC-3 audio stream and subtitle under its own category. And it makes process an attribute, an order and an operation, gives the last disk image (DVD). There are various types of Authoring tools in the market so that authoring tools can enable, encourage, and assist users ('authors') in the selection of tools that produce simple title and video production and editing suites. In this paper, we will compare and analyze authoring process in which image and sound are captured into DVD creation with IEEE 1394port with regard to Window system using generally with Desktop PC and the Macintosh of the PC on the system of Windows and OSX.

• The Journal of the Korea Contents Association
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• v.5 no.5
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• pp.145-151
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• 2005

We can define the procedure of Authoring that it makes area cord and the reproduction prevent menu programmed into MPEG II video stream , Audio which is AC-3 audio stream and subtitle under its own category. And it makes process an attribute, an order and an operation, gives the last disk image, Which is DVD(digital versatile disc). There are various process of Authoring tools in the market so that authoring tools can enable, encourage, and assist users ('authors') in the selection of tools that produce simple title, video production and editing suites. In this paper, we will compare and analyze authoring process in which image and sound are authorized into DVD with IEEE 1394port between Window system using generally with Desktop PC and the Macintosh that is based on OSX.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.608-610
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• 1999

유무선 복합환경에서 비디오 데이터의 전송은 무선 링크에서의 적은 대역폭과 높은 손실율에 의해 좋은 화질로 서비스 받기 힘들다. 특히 MPEG 등의 비디오 압축 표준은 많은 대역폭을 차지하며 패킷의 손실은 비디오의 다음 프레임의 화질에까지 영향을 미친다. 따라서 무선 환경에서 사용 가능한 대역폭과 에러율을 고려하여 가능한 최선의 화질을 제공하기 위해서 계층화된 비디오 데이터 스트림 포맷을 제안하고, 이를 이동 호스트에 전송하는 게이트웨이에서 무선 링크의 상황에 따라 전송률을 조정하는 알고리즘을 제안하고 실험하였다. 실험 환경으로 비디오 서버에서 게이트웨이 간의 유선 환경은 10Mbps 이더넷 링크, 게이트웨이에서 무선이동 호스트간의 무선 환경은 2Mbps WaveLAN을 사용하였다. 비디오 응용은 MPEG-1 비디오를 가정하였고 동적으로 FEC를 적용하는 방법을 무선링크의 에러와 전송률 조절에 사용한다.

• ETRI Journal
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• v.31 no.1
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• pp.65-67
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• 2009

We introduce an advanced terrestrial digital multimedia broadcasting (AT-DMB) system that overcomes the limitation of data transmission rates of T-DMB by doubling it with the same frequency bandwidth. In this letter, we propose an efficient algorithm which generates a scalable transport stream in AT-DMB by multiplexing certain types of elementary streams encoded using scalable video coding and an MPEG-surround audio coder for high-quality multimedia services.

• Journal of Broadcast Engineering
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• v.6 no.2
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• pp.169-176
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• 2001

Most of the previous video watermarking algorithms cannot be supported by real-time video processing. The maul reason is that in order to develop a robust algorithm the watermarking technique requires a very high computational cost when embedding and extracting the watermark in various frequency domains. Previous embedding methods simultaneously try to compress a video by MPEG and embed a watermark supporting real-time processing. However, In this paper, our proposed algorithm can support real-time processing in both spatial and frequency domains. First. the watermark is created on the courier transform domain, and next is inverse-Fourier-transformed ; then, we directly embed it into the video frame In the spatial domain. This procedure does not require a lot of the computational cost during embedding because of the spatial domain processing. Also, it is possible to support a video stream service and a very robust algorithm from MPEG compression and various geometric attacks.

• Journal of Broadcast Engineering
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• v.16 no.5
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• pp.811-823
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• 2011

This paper proposes an efficient transmission method for the panoramic multimedia contents. The panoramic video provides wide sight and various view-point to the user. The traditional methods of the panoramic multimedia content transmission has several limitations, as follow; A client suffers a long initial delay time to play a panoramic video when it is transmitted through a limited bandwidth network, because the panoramic video has larger data size than a general video. And if a client's display device has limited resolution, such as mobile phone, laptop PC monitor, etc. it can not display the entire panoramic video that has a wide view video sequence. So, in order to overcome the obstacles, this paper proposes an efficient transmission of panoramic multimedia contents. This method will increase the transmission efficiency throughout the technique of the scene description in MPEG-4 system. Also we demonstrated the efficiency of the proposed method by comparison with existing methods.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.739-742
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• 1998

실시간 동영상의 전송을 위해 본 논문에서는 USB를 전송매체로 하여 구현했다. USB는 키보드, 스태너, 모뎀등 다양하게 사용되고 있는 인터페이스를 한나로 통일하고, 포트의 부족을 해결하기 위해서 개발된 것으로 고속의 데어터전송(12Mbps)을 가능하다. USB의 고속데이터 전송의 특징은 정지화상(JPEG) 뿐만 아니라 실시간 동영상(MPEG1, MPEG2)의 전송을 가능하게 한다. 본 논문에서는 USB로 실시간 동영상 전송을 위한 시스템 구조를 제시하였고 보다 효율적인 데이터 전송을 위한 USB Data Transfer Type에 관해 연구하였다. 720×480의 동영상의 압축을 위해 기존의 널리 이용되는 DCT대신 wevelet 알고리즘을 이용하였고 실시간 압축과 복원을 위해 video compression codec인 adv601를 사용하여 동영상 및 정지화상압축을 하였다. 또한 DSP(TMS320C32)를 이용하여 Quantization Bin Width Calculation을 함으로써 video bit stream의 크기를 가변적으로 제어하려 하였다. 이로서 동영상의 전송시 발생될 수 있는 데이터 병목현상을 해결 하였고 USB뿐만 아니라 다양한 통신망｛ISDN(128Kbps), T1(1.5Mbps) T3(45Mbps)｝에서의 동영상의 실시간 전송이 가능한 시스템 구조를 제시하였다.