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ABSTRACT: The need of techniques for automatic video annotation and summarization has been increased because digital videos have been becoming available at an ever-increasing rate. In this paper, we present an automatic video annotation and summarization system which employs the ontologies and semantic inference rules to facilitate the video retrieval. In our work, high -level concepts of shot / group /scene /video level are automatically extracted by applying semantic inference rules to VideoAnnotation ontology and object ontology. Finally, we show the retrieval effectiveness of our approach and discuss the future work.
Semantics, Knowledge and Grid, Third International Conference on; 11/2007
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ABSTRACT: In this paper, we present a cache management policy to efficiently store the videos in a proxy server. The objective of cache management policy is to maximize the quality of service (QoS) to interested clients by improving the hit rate of popular videos. Our cache management policy is based on capturing the changing preference of the videos according to recentness, frequency, and playback length of the requested videos. For this purpose, we define a parameter, access time, which represents the total playback time of video within a predefined interval. We also utilize the time popularity (TP) that denotes the number of client access to the each video within a predefined interval. Using the access time and TP, we can estimate a maximum available space of a video which means the maximum size of storage space to be allocated to the video. Our simulation results show that the bit rate of the proposed method is greater than the previous works. The simulation results show that the proposed algorithm performs better than other algorithm such as LRU, LFU, and TP methods in terms of packet bit rate in random access pattern and Zipf distribution access pattern.
Consumer Electronics, 2005. (ISCE 2005). Proceedings of the Ninth International Symposium on; 07/2005
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ABSTRACT: In this paper, a routing protocol to provide an enhanced multicasting service to mobile hosts in IPv6 based networks is proposed. The main purpose of the algorithm is to reduce both the number of multicast tree reconstructions and multicast service disruption time. The proposed multicast routing protocol is a hybrid method using the advantages of the bidirectional tunneling and the remote subscription proposed by the IETF Mobile EP working group. The proposed scheme satisfies the maximum tolerable transfer delay time and supports the maximum tunneling service. The simulation results show that the proposed protocol has better performance in the number of multicast tree reconstruction and the time of multicast service disruption than the previous protocols does.
Consumer Communications and Networking Conference, 2005. CCNC. 2005 Second IEEE; 02/2005
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Distributed Computing - IWDC 2005, 7th International Workshop, Kharagpur, India, December 27-30, 2005, Proceedings; 01/2005
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Networking - ICN 2005, 4th International Conference on Networking, ReunionIsland, France, April 17-21, 2005, Proceedings, Part II; 01/2005
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ABSTRACT: A routing protocol to provide an efficient multicasting service to
mobile hosts in IPv6 based networks is proposed. The main purpose of the
algorithm is to reduce both the number of multicast tree reconstructions
and multicast service disruption time. The proposed protocol satisfies
the maximum tolerable transfer delay and supports the maximum tunnelling
service
Electronics Letters 09/2002; · 0.96 Impact Factor
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ABSTRACT: A slotted ALOHA-based random access protocol for a WCDMA system is
proposed. To resolve the bistable problem of the slotted ALOHA, the
proposed protocol controls the random access rates according to the
characteristics of traffic classes. To ensure stable throughput, a
mathematical model is developed which derives a correlation between the
offered load and the access rate
Electronics Letters 10/2001; · 0.96 Impact Factor
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ABSTRACT: In the Data Over Cable Service Interface Specification (DOCSIS)
RFI v1.1, the control message, called MAP, is used to schedule the
uplink radio frequency between the cable modem (CM) and the cable modem
termination system (CMTS). We find out the appropriate MAP size and the
optimum ratio between contention slots and grant slots in a MAP through
computer simulations. To assess the performance of DOCSIS RFI v1.1 the
Common Simulation Framework (CSF) is used. According to the simulation
results the throughput and delay show best performance and the best
choice for the number of contention slots may be six when the MAP size
is 2 msec. The goodput for the upstream channel capacity is found to be
about 58%
Communications, 2001. ICC 2001. IEEE International Conference on; 02/2001
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[show abstract]
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ABSTRACT: We propose a multicast routing scheme for an efficient and
reliable support of multicast service to mobile hosts in IPv6 based
networks. The purpose of this paper is to develop an algorithm to reduce
both the number of multicast tree reconstruction and the multicast
service disruption time. The proposed multicast routing scheme is a
hybrid method using the advantages of the bi-directional tunneling and
the remote subscription proposed by the IETF Mobile IP working group.
The proposed scheme satisfies the maximum tolerable transfer delay time
and supports the maximum tunneling service. The simulation results show
that the proposed scheme has a better performance in the number of
multicast tree reconstruction and the time of multicast service
disruption than the previous schemes does
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE; 02/2001
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ABSTRACT: We propose a bandwidth management scheme to efficiently guarantee the QoS of various services on IMT-2000 networks. The proposed bandwidth management scheme consists of the call admission control based on the guard channel and the time slot scheduling in wireless links. For the call admission control the preemption and deprivation method are used to overcome the problems in the previous guard channel scheme. The proposed time slot scheduling scheme allocates time slots based on the QoS requirements of each user. The time slots are dynamically scheduled by considering the current traffic conditions with the DQRUMA protocol. The simulation results show that the proposed bandwidth scheme has better performance than the previous works in terms of the handoff failure probability and the packet delay time
Information Technology: Coding and Computing, 2000. Proceedings. International Conference on; 02/2000
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ABSTRACT: We propose a new watermarking method to embed a label in a video
which is robust against the change of the group of picture. The proposed
method embeds labels in the pixel domain, but detects them in the DCT
frequency domain. A lookup table of the unique relationship between the
pixel patterns and their sign sequences of eight low DCT coefficients is
employed. To keep a quality of videos after embedding a label, the size
of watermark is determined based on the human visual system. We analyze
bit error rates of labels embedded in MPEG2 compressed video using the
central limit theorem and compare the simulation results with previous
methods
Multimedia and Expo, 2000. ICME 2000. 2000 IEEE International Conference on; 02/2000
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2000 International Symposium on Information Technology (ITCC 2000), 27-29 March 2000, Las Vegas, NV, USA; 01/2000
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ABSTRACT: In this paper, a new watermarking method to embed robust data
against JPEG compression and noise without degrading an image quality is
proposed. To guarantee that embedded data are invisible, the proposed
method adaptively determines a different size of watermark for each
frequency coefficient using human visual system models. The position to
be watermarked is chosen in low frequencies using a Pn-sequence to
prevent the embedded data from being removed or changed. Experimental
results show that the proposed method is better than previous works in
terms of bit error of a detected data against JPEG compression
Circuits and Systems, 1998. IEEE APCCAS 1998. The 1998 IEEE Asia-Pacific Conference on; 12/1998
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ABSTRACT: In this paper, we propose a dynamic bandwidth allocation based on transfer rate ratio to efficiently provide ABR service in ATM networks. The proposed method is a measurement-based approach for a distributed bandwidth allocation of explicit rate. The ATM switch can rapidly adapt to the bandwidth variation of ATM networks and the transfer rate variation of ABR source. The proposed method also makes the best use of the available bandwidth of ATM networks. The simulation results demonstrate that the proposed method achieves the more fair bandwidth allocation and higher link utilization than those achieved by existing methods
Circuits and Systems, 1998. IEEE APCCAS 1998. The 1998 IEEE Asia-Pacific Conference on; 12/1998
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ABSTRACT: A new cell multiplexing algorithm is proposed to satisfy the
service requirements of real-time traffic in ATM networks. The proposed
algorithm is capable of assigning higher weights to real-time traffic
than to non-real-time traffic, thereby guaranteeing the quality of
service of real-time traffic. Simulation results show that the proposed
algorithm has better performance than other cell multiplexing algorithms
in terms of the mean delay time and the maximum queue length
Electronics Letters 11/1998; · 0.96 Impact Factor
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ABSTRACT: In this paper, efficient techniques for solder joint inspection have been described. Using three layers of ring shaped LED's with different illumination angles, three frames of images are sequentially obtained. From these images the regions of interest (soldered regions) are segmented, and their characteristic features including the average gray level and the percentage of highlights-referred to as 2D features-are extracted. Based on the backpropagation algorithm of neural networks, each solder joint is classified into one of the pre-defined types. If the output value is not in the confidence interval, the distribution of tilt angles-referred to as 3D features-is calculated, and the solder joint is classified based on the Bayes classifier. The second classifier requires more computation while providing more information and better performance. The proposed inspection system has been implemented and tested with various types of solder joints in SMDs. The experimental results have verified the validity of this scheme in terms of speed and recognition rate
Applications of Computer Vision, 1996. WACV '96., Proceedings 3rd IEEE Workshop on; 01/1997
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ABSTRACT: This paper presents a desktop video conferencing system, called
Seodang, for collaborative learning. Seodang enables individuals to
participate in telelearning, connecting people together over distances
in natural ways for the purpose of learning. The system consists of a
video conferencing system and application-specific programs. The video
conferencing system provides two-way audio and video communications
using MuX. Other application programs include shared electronic
whiteboard, query control system, presentation manager and student
database manager. Each of these applications provides useful tools that
improve the quality of learning, while students are allowed to
participate interactively. Design and implementation of the system is
presented along with its communication characteristics
Circuits and Systems, 1996., IEEE Asia Pacific Conference on; 12/1996
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[show abstract]
[hide abstract]
ABSTRACT: In this paper, efficient techniques for solder joint inspection have been described. Using three layers of ring shaped LED's with different illumination angles, three frames of images are sequentially obtained. From these images the regions of interest (soldered regions) are segmented, and their characteristic features including the average gray level and the percentage of highlights-referred to as 2D features-are extracted. Based on the backpropagation algorithm of neural networks, each solder joint is classified into one of the pre-defined types. If the output value is not in the confidence interval, the distribution of tilt angles-referred to as 3D features-is calculated, and the solder joint is classified based on the Bayes classifier. The second classifier requires more computation while providing more information and better performance. The proposed inspection system has been implemented and tested with various types of solder joints in SMDs. The experimental results have verified the validity of this scheme in terms of speed and recognition rate.
Applications of Computer Vision, IEEE Workshop on. 12/1996;
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[show abstract]
[hide abstract]
ABSTRACT: Efficient techniques for solder joint inspection are described.
Using three layers of ring shaped LEDs with different illumination
angles, three frames of images are sequentially obtained. From these
images the regions of interest (soldered regions) are segmented, and
their characteristic features including the average gray level and the
number of highlights-referred to as 2D features-are extracted. Based on
the minimum distance classification rule, each solder joint is
classified into one of the pre-defined types. If the classification is
ambiguous, the distribution of tilt angles-referred to as 3D features-is
calculated, which requires more computation while providing more
information and better performance. The proposed inspection system has
been implemented and tested with various types of solder joints in SMDs.
The experimental results have verified the validity of this scheme in
terms of speed and recognition rate
Image Processing, 1996. Proceedings., International Conference on; 10/1996
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[show abstract]
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ABSTRACT: A visual programming environment is proposed for image processing
and computer vision, which is based on a dataflow model. A reusable GUI
environment is designed by separating user interface and algorithms. A
scheduling algorithm is also developed for the synchronous dataflow
diagram. To exploit the parallelism of dataflow diagrams, a remote
procedure call (RPC) to each processing node is executed. Some practical
examples using our visual environment are presented and the performance
improvement by RPC is quantified as the number of servers on the network
increases
Image Processing, 1996. Proceedings., International Conference on; 10/1996
