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Communications, 1999. APCC/OECC '99. Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference

Date 18-22 Oct. 1999

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  • APCC/OECC'99

    Page(s): 0_2
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    Freely Available from IEEE
  • Looking into the multimedia services in GSM network

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    With the booming of GSM subscription and Internet access, multimedia applications for mobile users have turned out to be most interesting and demanding industry globally. Based on a market study and the technology evolution, we try a draw a picture for multimedia services in mobile networks. View full abstract»

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  • DAVIC-compliant multimedia presentation through MHEG/DSM-CC

    Page(s): 826 - 829 vol.2
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    The development of computer and communication technologies has led to the emergence of multimedia-based systems that handle a variety of media (from text to audio-visual data) and their integration. This paper investigates the fundamentals of MHEG presentation, which often requires efficient and effective audio-visual data transmission based on the Digital Audio-Visual Council (DAVIC) specifications. The paper also provides an insight into DAVIC specifications, including relevant issues such as digital storage media command and control (DSM-CC) and common object request broker architecture (CORBA). View full abstract»

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  • Several fundamental issues for a distributed hypermedia document system supporting mobile hosts

    Page(s): 830 - 832 vol.2
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    Mobile computing is a new computing paradigm and a new research topic, which carries new challenges. This paper discusses several basic issues on a distributed hypermedia document system to support mobile users. View full abstract»

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  • An effective storage and management paradigm of multimedia documents

    Page(s): 833 - 836 vol.2
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    In this paper, taking advantage of the openness of multimedia documents, we propose a paradigm for their storage and management, which employs DBMS sensibly. The paradigm results in low management overhead and high access efficiency. Our discussion focuses on the model and its integration with the World Wide Web (WWW) framework. View full abstract»

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  • Remote interaction with heterogeneous databases based on TMN and BWD

    Page(s): 837 - 840 vol.2
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    With the rapid development of the current information networks, there are various databases, operating systems and network platforms coexisting in the networks. Therefore, it is important to find a remote interactive way to manipulate the various databases on a uniform operating platform. We demonstrated the feasibility of such a way in the three-tier client/server architecture (BWD) based on the theory of telecommunications management networks (TMN), and the simulation of which in an experimental environment has been realized. View full abstract»

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  • Performance evaluation of scene change detection algorithms

    Page(s): 841 - 844 vol.2
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    Scene change detection algorithms become the key issues especially for video information in many digital video applications such as digital libraries and video servers. The accuracy and execution speed of the scene change detection algorithm is critical if large amounts of video data are to be processed. In this paper, we discuss the performance of the three previous proposed methods and present a new algorithm to use the histogram difference of DC images incorporating the HVS (human visual system) for fast and accurate detection. The simulation results are also presented for two test video sequences, commercials and news, to show that the proposed algorithm works better than the previous ones. View full abstract»

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  • Fractal based texture analysis for retrieval of image data

    Page(s): 845 - 848 vol.2
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    In this paper, directional fractal dimensions are computed for a special class of images with lines and curves. Then the texture variation coefficient is defined and a simple algorithm for detecting singularity fields of an image is proposed. Experiments show that 92% singularity fields are correctly recognized by the proposed algorithm, and this will greatly help with content-based retrieval of texture images from a large database. View full abstract»

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  • Encoding 3D video by using APOM

    Page(s): 849 - 852 vol.2
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    In this paper, we propose a new approach for encoding 3D video in virtual reality by using the active/passive optical mechanism (APOM). This mechanism which is based on a field-sequential standard for encoding the 3D-video format collaborates with only a single CCD camera. The core of this research is to substitute the double camera geometry with a single camera geometry collaborating with APOM. In this way, not only does the system perform in real time, but also it reduces the geometrical complexities and signal streams of 3D video when compared with the double camera technique. View full abstract»

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  • IP videoconferencing embracing the next era of visual collaboration

    Page(s): 853 - 863 vol.2
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    The world of videoconferencing has begun expanding to H.323 (IP) because this standard enables mass deployment of lower cost, desktop videoconferencing systems. As desktop videoconferencing becomes more popular, users are demanding that IT organizations offer this capability across the company-wide network. The standard has since been updated for networked multimedia broadcasting. However, due to latency and bandwidth issues inherent in IP networks, the H.323's potential for videoconferencing has not been realized. With the increasing adoption of IP networks and IP multimedia technology, users are looking forward to the time when they can drop expensive ISDN connections altogether and move voice, video, and data over to IP networks. Until that happens, IT managers must find a videoconferencing platform that delivers the best quality possible today while maintaining compatibility with tomorrow's IP-based systems. This paper outlines the solutions and technology choices available today, and explains how to design a future-proof videoconferencing solution as IP continues to evolve. View full abstract»

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  • Virtual education environment for engineering courses

    Page(s): 864 - 867 vol.2
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    This paper discusses a proposed virtual education environment for engineering courses in our university. The virtual education environment can be realized by connecting various functional blocks by network. Each functional block is a combination of hardware and software that provides a specific function. View full abstract»

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  • Media synchronization solutions for Web-based distance learning

    Page(s): 868 - 871 vol.2
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    Media synchronization techniques for Web-based distance learning are introduced. As we know, the distance learning system is a typical multimedia application system. It involves many kinds of information media, for example, video, audio, graphics and text. The outstanding property of a distance learning system is that these media information are not independent, they have a temporal and spatial relationship to some extent. After transmission through the network, how to keep the synchronization relationship of these media information is the central issue in distance learning system. In this article, some media synchronization techniques are discussed in detail. Considering the property of video and audio information, we also present a network multicast solution. View full abstract»

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  • Implementation of education system under distributed databases over WWW for international use

    Page(s): 872 - 875 vol.2
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    An education system under distributed databases has been designed and implemented for international use that can supply teaching materials over the Wold Wide Web (WWW). According to the design, the system was implemented and examined. The system design and the functions are described. View full abstract»

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  • A solution to mix low bit-rate speech signal in decentralized multipoint conference

    Page(s): 876 - 879 vol.2
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    The mixing algorithm for low bit-rate audio streams plays an important part in a decentralized multipoint conference system. In this article, from the fundamental principle of linear prediction codecs, a new mixing scheme for low bit-rate audio streams based on a comparison between the energy of the exciting series of the input bit streams is deduced to overcome the main disadvantages of the traditional mixing schemes. By its embodiment of the speech signals in line with ITU-T Recommendation G.723.1, it can be concluded that this solution is reliable, practical and of low complexity, satisfying the acoustical quality and the effective suppression of the accumulated background noise. View full abstract»

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  • Speech communication for working group based on LAN

    Page(s): 880 - 883 vol.2
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    We present a system which is used for working group speech communication based on a LAN (local area network). In our system we need a multimedia PC and a network adapter. People may use speech to communicate with each other in the working group. The system is based on client/server architecture. Packet exchange is used to pass speech signals through the LAN. In order to shorten the speech communication delay we used the LD-CELP algorithm in the software coder/decoder for signal compression. The original speech signal is 64 kbps compressed to 16 kbps. For speech communication in the working group the system is simpler than the IP phone. View full abstract»

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  • Study on B-IP for provision of the multimedia video conference

    Page(s): 884 - 887 vol.2
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    The role of the resource has become more and more important for the provision of multimedia services. However, today it is still difficult to supply multimedia services in a public network. The difficulty lies in resource selection, charging and service profile submission etc. The problem can be solved by deploying broadband intelligent network technology. The broadband intelligent network system is a new architecture which aims to create and implement new broadband multimedia services quickly, flexibly and cost-efficiently. The broadband intelligent peripheral (B-IP) is an important function entity of the intelligent network (IN), whose role is to provide a special resource with services. The B-IP makes the resource more intelligent and flexible. We firstly introduce B-IP's definition and access mode. We also propose the design scenario of the B-IP based on the broadband multipoint control unit (MCU) independently. After that we give the performance analyses. View full abstract»

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  • Research on PC-based multimedia communication terminals

    Page(s): 888 - 891 vol.2
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    This paper presents some improved algorithms of video and audio codecs for multimedia communication terminals based on an Intel Pentium PC under the Win9x OS. They are optimized using the characteristics of an Intel Pentium processor, and simplified depending on human perception. They have been used in ITU-T H.263 and G.723.1 to a completed H.323 using an Intel Pentium II 350 MHz processor as a hardware platform. This H.323 terminal can code and decode an audio signal in real time together with coding and decoding a video signal of about 15 frame/s with the CIF format. View full abstract»

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  • A new scheme of progressive image transmission based on bit-plane method

    Page(s): 892 - 895 vol.2
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    The bit-plane method (BPM) is the simplest way to implement the progressive image transmission (PIT) system. In this paper, we propose a simple and effective method to improve the image quality of the BPM in each phase. This method generates a tree-structured codebook to describe the contents of the pixels of the transmitted image. By transmitting this tree structured codebook to the receiver level by level, we can increase the image quality of the BPM in each phase. The experimental results show that the image quality of our scheme turns out better than that of the BPM. Moreover, our scheme can better impress the human visual system in an earlier phase than the BPM. View full abstract»

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  • Fast Internet wavelet image transmission

    Page(s): 896 - 899 vol.2
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    Images are usually transmitted across the Internet using a lossless protocol such as TCP/IP. Lossless protocols require retransmission of lost packets; which substantially increase transmission time. We introduce a fast lossy Internet image transmission scheme (FLIIT) for compressed images which eliminates retransmission delays by strategically shielding important portions of the image with redundancy bits. We describe a joint source-channel coding algorithm which efficiently allocates quantizer resolution bits and redundancy bits to control quantization errors and expected packet transmission losses. We describe an implementation of this algorithm and compare its performance on the Internet to lossless TCP/IP transmission of the same images. In our experiments the FLIIT scheme transmitted images five times faster than TCP/IP during the day with resulting images of equivalent quality. View full abstract»

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  • Wavelet image coding based on significance extraction using morphological operation

    Page(s): 900 - 903 vol.2
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    In this paper, an efficient embedded image compression algorithm is presented. It is based on the observation that the distribution of significant coefficients is intra-subband clustered and inter-subband self-similar. Morphological dilation is used to capture the clustered significant coefficients in each subband, resulting in the partitioning of each subband into significance clusters and insignificance space. Thus for entropy coding, different probability models are used for different regions according to their own probability distributions. When encoding the insignificant space, which contains mostly zeros, investigation reveals that the zerotree data structure is not very efficient to represent zeros across scales for texture images and a more efficient method is presented. Experimental results show that the proposed algorithm is very effective especially for texture images. View full abstract»

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  • An efficient Huffman decoding method based on pattern partition and look-up table

    Page(s): 904 - 907 vol.2
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    An efficient Huffman decoding method is presented in this paper. This new method first partitions a Huffman tree into subtrees by a set of regular bit-patterns. Then, some look-up tables are used to represent these subtrees. Using this method, a Huffman tree can be represented compactly and the decoding of codewords can be performed quickly by the matching of regular bit-patterns. View full abstract»

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  • Three goals in designing VLSI architectures for video compression

    Page(s): 908 - 911 vol.2
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    Video compression is characterized by the diversity in algorithms, the complexity of computation and the high throughput rate. The requirement of diversity and high performance in video compression brings forward some important goals in designing the VLSI architecture. In this paper, three very important goals are introduced into the design of VLSI architectures for video compression. In the main part of the paper, why each design goal should be considered, what are the problems in achieving each goal and what techniques can be used to achieve each goal are studied. View full abstract»

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  • A quadtree classified-based fractal image coding approach

    Page(s): 912 - 915 vol.2
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    In this paper, an image coding approach is developed based on the quadtree classified method. It can solve the problem that some range blocks cannot be coded under the conventional fractal coding method. Experimental results show that compared to the conventional automatic fractal coding method, this approach can obtain high compression ratio with no apparent depression on the quality of the reconstructed image. View full abstract»

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  • Automatic face segmentation in YCrCb images

    Page(s): 916 - 919 vol.2
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    This paper presents a novel technique to automatically detect the human face in videophone images with YCrCb format. By using the Cr-Cb histogram to eliminate the background, and applying region growing in the remaining areas, we can, with the aid of the proposed criteria, accurately detect the face from a complex background. View full abstract»

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  • Adaptive block-matching algorithm for video compression

    Page(s): 920 - 923 vol.2
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    Block-matching motion estimation plays an important role in video coding. In this paper, we present an adaptive block-matching algorithm, which determines the candidate motion vectors and a dynamic search window based on the spatial and temporal neighbor blocks. According to the mean absolute error (MAE) based on these motion vectors, stop search, 3/spl times/3 neighbor window search and modified 3SS search in the dynamic window is applied adaptively. This method can significantly reduce search time while the performance is still maintained. Simulation results show the performance of this algorithm is very similar to that of the full search algorithm (FSA) and the computation complexity is smaller than that of 3SS and 4SS. View full abstract»

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