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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Broadcast Engineering
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Journal DOI :
The Korean Institute of Broadcast and Media Engineers
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Volume & Issues
Volume 13, Issue 6 - Nov 2008
Volume 13, Issue 5 - Sep 2008
Volume 13, Issue 4 - Jul 2008
Volume 13, Issue 3 - May 2008
Volume 13, Issue 2 - Mar 2008
Volume 13, Issue 1 - Jan 2008
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Network-adaptive H.264 Video Streaming over IEEE 802.11e
Lee, Sun-Hun ; Chung, Kwang-Sue ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 6~16
DOI : 10.5909/JBE.2008.13.1.6
An instable wireless channel condition causes more packet losses and retransmissions due to interference, fading, station mobility, and so on. Therefore video streaming service over a wireless networks is a challenging task because of the changes in the wireless channel conditions and time-constraints characteristics of the video streaming services. To provide efficient video streaming over a wireless networks, QoS-enhanced MAC protocol, IEEE 802.11e, is standardized recently. Tn this paper, we propose a new network-adaptive H.264 video streaming mechanism in the IEEE 802.11e wireless networks. To improve the quality of video streaming services, video stream has to adapt to the changes in the wireless channel conditions. The wireless channel conditions are estimated by the packet loss probability and informed to the application layer by the cross-layering. According to the wireless channel information, the video streaming application filters out the low-priority data. This adaptation mechanism efficiently uses system resources because it drops the low-priority data in advance. Therefore, our cross-layer design can provide improved video streaming services to the end-user. Through the implementation and performance evaluation, we prove that the proposed mechanism improves the QoS of the video streaming by providing the smoothed playback.
Control Flow for Multi-Stream Video of Session Layer in IP Multimedia Subsystem
Park, Su-Young ; Lee, Sang-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 17~24
DOI : 10.5909/JBE.2008.13.1.17
At the view of Application layer, there are many researches to achieve the cross-layer optimization with Physical layer. Scalable video coding is good example. Although it is necessary to consider the session layer which lies halfway between two layers, the research about that is insufficient. We present a feasible solution of dynamic session control for scalable video coding over IMS.
Quality-Enhancement Technique on Video telephony over WCDMA Network
Kim, Yo-Han ; Kwak, Hyong-Won ; Shin, Ji-Tae ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 25~33
DOI : 10.5909/JBE.2008.13.1.25
Video telephony is a representative service in 3G mobile network. And there have been efforts to improve quality of video telephony service in different fields. In Korea, the leading mobile service provider SKTelecom and KTF service the WCDMA network as 3G mobile network. Now, more than a million people is using the network. In this paper, we study about video telephony over WCDMA network. and propose error minimizing algorithm using cross-layer adaptation between physical layer and video codec. We simulated 3G-324M protocol with MPEG-4 video codec, and simulation results show suggested algorithm improve packet transmission rate for improving quality of video telephony service.
Multi-channel Adaptive SVC Video Streaming with ROI
Lee, Jung-Hwan ; Ryu, Eun-Seok ; Yoo, Hyuck ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 34~42
DOI : 10.5909/JBE.2008.13.1.34
This paper proposes the mechanism which improves the qualify of video on a limited network bandwidth by applying the ROI technique to an H.264 Scalable Extension technique. The network environment assumed in this parer is the next generation network convergence environment in which the mobile device has one or more network interfaces. Therefore, we allocate the priority to video packets as the hierarchy structure of H.264 SVC-encoded video stream and ROI information, and transmit those packets over appropriate network channel for using those multiple network interfaces. This paper shows two experiments first one is extracting and allocating the video stream on an appropriate network channel, second one is unequal packet transmission by allocated priorities (e.g. ROI). Performance evaluations show that this approach delivers an improved decoded video quality when compared with conventional transmission schemes, especially on device which has multiple network interfaces.
Efficient Oblivious Search on Encrypted Data
Rhee, Hyun-Sook ; Park, Jong-Hwan ; Lee, Dong-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 43~52
DOI : 10.5909/JBE.2008.13.1.43
We study the problem of search in which a server contains various multimedia contents and a user wishes to retrieve some multimedia items containing a specific without revealing to the server which items they are. Recently, Ogata and Kurosawa introduced a search scheme by using the notion of oblivious transfer. In their scheme, a user must inefficiently search and compare all the data stored in the seuer for each search query. In this paper, we propose an efficient oblivious search by using the oblivious transfer, in which a user needs not to search and compare all the data. We formally prove that the proposed scheme is secure under the hardness of RSA known target inversion problem.
Forward-Secure Public Key Broadcast Encryption
Park, Jong-Hwan ; Yoon, Seok-Koo ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 53~61
DOI : 10.5909/JBE.2008.13.1.53
Public Key Broadcast Encryption (PKBE) allows a sender to distribute a message to a changing set of users over an insecure channel. PKBE schemes should be able to dynamically exclude (i.e., revoke) a certain subset of users from decrypting a ciphertext, so that only remaining users can decrypt the ciphertext. Another important requirement is for the scheme to be forward-secrecy. A forward-secure PKBE (fs-PKBE) enables each user to update his private key periodically. This updated private key prevents an adversary from obtain the private key for certain past period, which property is particularly needed for pay-TV systems. In this paper, we present a fs-PKBE scheme where both ciphertexts and private keys are of
size. Our PKBE construction is based on Boneh-Boyen-Goh`s hierarchical identity-based encryption scheme. To provide the forward-secrecy with our PKBE scheme, we again use the delegation mechanism for lower level identities, introduced in the BBG scheme. We prove chosen ciphertext security of the proposed scheme under the Bilinear Diffie-Hellman Exponent assumption without random oracles.
Dictionary attack of remote user authentication scheme using side channel analysis
Kim, Yong-Hun ; Youn, Taek-Young ; Park, Young-Ho ; Hong, Seok-Hee ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 62~68
DOI : 10.5909/JBE.2008.13.1.62
Remote user authentication scheme is a cryptographic tool which permits a server to identify a remote user. In 2007, Wang et al. pointed out that Ku`s remote user authentication scheme is vulnerable to a dictionary attack by obtaining some secret information in a smart card using side channel attacks. They also proposed a remote user authentication scheme which is secure against dictionary attack. In this paper, we analyze the protocol proposed by Wang et al. In the paper, it is claimed that the protocol is secure even though some values, which is stored in a smart card, are revealed to an adversary, However, we show that their protocol is insecure if the values are disclosed to an adversary.
Flexible Batch Signing Techniques for Imbalanced Environments
Youn, Taek-Young ; Lee, Se-Won ; Park, Young-Ho ; Kim, Chang-Han ; Lim, Jong-In ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 69~78
DOI : 10.5909/JBE.2008.13.1.69
Batch signature is a cryptographic tool which efficiently generates several signatures for multiple messages. Previously proposed batch signature schemes do not allow a signer to generate a signature immediately for sequentially asked signing queries. In other words, the previous schemes are not applicable when signing requests are not simultaneously given to the signer. In this paper, we propose flexible batch signatures which can provide batch signing for sequential signing requests. Moreover, our schemes are well suited for imbalanced environment where two communicating parties have different computing powers.
Analysis on Zhou et al.`s ID-Based Authenticated Group Key Agreement To Exchange Secure Contents among Group Users
Choi, Jae-Tark ; Kwon, Jeong-Ok ; Yoon, Seok-Koo ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 79~85
DOI : 10.5909/JBE.2008.13.1.79
An authenticated group key agreement protocol allows a group of parties communicating over an insecure network to share a common secret key. In this paper, we show that Zhou et al.`s ID-based authenticated group key agreement schemes do not provide forward secrecy.
Effective and Statistical Quantification Model for Network Data Comparing
Cho, Jae-Ik ; Kim, Ho-In ; Moon, Jong-Sub ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 86~91
DOI : 10.5909/JBE.2008.13.1.86
In the field of network data analysis, the research of how much the estimation data reflects the population data is inevitable. This paper compares and analyzes the well known MIT Lincoln Lab network data, which is composed of collectable standard information from the network with the KDD CUP 99 dataset which was composed from the MIT/LL data. For comparison and analysis, the protocol information of both the data was used. Correspondence analysis was used for analysis, SVD was used for 2 dimensional visualization and weigthed euclidean distance was used for network data quantification.
Effective Feature Selection Model for Network Data Modeling
Kim, Ho-In ; Cho, Jae-Ik ; Lee, In-Yong ; Moon, Jong-Sub ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 92~98
DOI : 10.5909/JBE.2008.13.1.92
Network data modeling is a essential research for the evaluation for intrusion detection systems performance, network modeling and methods for analyzing network data. In network data modeling, real data from the network must be analyzed and the modeled data must be efficiently composed to reflect a sufficient amount of the original data. In this parer the useful elements of real network data were quantified from packets captured from a huge network. Futhermore, a statistical analysis method was used to find the most effective element for efficiently classifying the modeled data.
Visually Lossless Image Compression for Digital Cinema Distribution Based on DCI Specification
Kim, Chul-Hyun ; Paik, Joon-Ki ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 99~108
DOI : 10.5909/JBE.2008.13.1.99
This raper analyzes the effect of visually lossless image compression for efficient distribution of digital cinema. Currently, distribution of digital cinema is carried out based on JPEG 2000 standard that has been selected by DCI. We first summarize characteristics of JPEG 2000, and then define the concept of visually lossless coding that plays an important role in digital cinema distribution. We provide a test for JPEG 2000 compression performance according to DCI specification for visually lossless. Based on the experiment, the result satisfies high quality for cinema distribution.
Preprocessing Method for Efficient Compression of Patch-based Image
Lee, Sin-Wook ; Lee, Sun-Young ; Chang, Eun-Youn ; Hur, Nam-Ho ; Jang, Euee-S. ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 109~118
DOI : 10.5909/JBE.2008.13.1.109
In mapping a texture image into a 3D mesh model for photo-realistic graphic applications, the compression of texture image is as important as geometry of 3D mesh. Typically, the size of the (compressed) texture image of 3D model is comparable to that of the (compressed) 3D mesh geometry. Most 3D model compression techniques are to compress the 3D mesh geometry, rather than to compress the texture image. Well-known image compression standards (i.e., JPEG) have been extensively used for texture image compression. However, such techniques are not so efficient when it comes to compress an image with texture patches, since the patches are little correlated. In this paper, we proposed a preprocessing method to substantially improve the compression efficiency of texture compression. From the experimental results, the proposed method was shown to be efficient in compression with a bit-saving from 23% to 45%.
Switching Picture Added Scalable Video Coding and its Application for Video Streaming Adaptive to Dynamic Network Bandwidth
Jia, Jie ; Choi, Hae-Chul ; Kim, Hae-Kwang ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 119~127
DOI : 10.5909/JBE.2008.13.1.119
Transmission of video over Internet or wireless network requires coded stream capable of adapting to dynamic network conditions instantly. To meet this requirement, various scalable video coding schemes have been developed, among which the Scalable Video Coding (SVC) extension of the H.264/AVC is the most recent one. In comparison with the scalable profiles of previous video coding standards, the SVC achieves significant improvement on coding efficiency performance. For adapting to dynamic network bandwidth, the SVC employs inter-layer switching between different temporal, spatial or/and fidelity layers, which is currently supported with instantaneous decoding refresh (IDR) access unit. However, for real-time adaptability, the SVC has to frequently employ the IDR picture, which dramatically decreases the coding efficiency. Therefore, an extension of SP picture from the AVC to the SVC for an efficient inter-layer switching is investigated and presented in this paper. Simulations regarding the adaptability to dynamic network bandwidth are implemented. Results of experiment show that the SP picture added SVC provides an average 1.2 dB PSNR enhancement over the current SVC while providing similar adaptive functionality.
Fast Motion Estimation Using Local Statistics of Neighboring Motion Vectors
Kim, Ki-Beom ; Jeong, Chan-Young ; Hong, Min-Cheol ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 128~136
DOI : 10.5909/JBE.2008.13.1.128
In this paper, we propose a variable step search fast motion estimation algorithm using local statistics of neighboring motion vectors. Using the degree of correlation between neighboring motion vectors, motion search range is adaptively adjusted to reduce unnecessary search points. Based on the adjusted search range, motion vector is obtained by variable search step. Experimental results show that the proposed algorithm has the capability to dramatically reduce the search points and computing cost for motion estimation, comparing to fast full spiral search motion estimation and other fast motion estimation.
A Fast Macroblock Mode Decision Method using PSNR Prediction for H.264/AVC
Park, Sung-Jae ; Myung, Jin-Su ; Sim, Dong-Gyu ; Oh, Seoung-Jun ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 137~151
DOI : 10.5909/JBE.2008.13.1.137
H.264/AVC is showed high coding efficiency more than previous video coding standard by using new coding tools. Specially, Variable block-based motion estimation and Rate-Distortion Optimization are very important coding tools in H.264/AVC. These coding tools have high coding efficiency, however the encoder complexity greatly increase due to these coding tools. In this paper, we propose early SKIP mode decision and selective inter/intra mode decision to reduce the computational complexity. Simulation results show that the proposed method could reduce encoding time of the overall sequences by 30% on average than JM 10.2 without noticeable degradation of coding efficiency. Besides, the proposed method runs over twice as fast as the previous proposed Fast Coding Mode Selection method (FCMS).
RD-Optimized Search-Mode Restriction Method on the Enhancement Layer for Fast Encoding of H.264 Scalable Extension
Lee, Keum-Hee ; Lim, Jin-Young ; Jung, Kyeong-Hoon ; Kim, Ki-Doo ; Kang, Dong-Wook ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 152~161
DOI : 10.5909/JBE.2008.13.1.152
We investigate that when we restrict the encoding modes on the enhancement layer based on that of the base layer exploiting the high correlation between the best modes at base and enhancement layers, we should determine the set of surviving search modes to yield the minimum excessive RD-cost caused by the restriction. Based on these sets, we implement a fast mode decision algorithm for H.264 Scalable Extension (SE). Simulation results show that the proposed algorithm is superior in the sense of the RD-performance to the conventional mode restriction method which is based on the conditional probabilities of the best modes.
Heterogeneous Resolution Stereo Video Coding System
Park, Sea-Nae ; Sim, Dong-Gyu ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 162~173
DOI : 10.5909/JBE.2008.13.1.162
In this paper, we propose an effective stereo-view video coding method that considers stereo-view and displayer characteristics. Current many stereo video displayers are designed for not only stereo display but also conventional single view display. In these systems, the resolution of two input videos for a stereo mode is half of that of single view for compatibility with conventional single view video services. In this raper, we propose a stereo video codec to deal with both single view and stereo view services by encoding whole left image and down-sampled right image. However, direct disparity estimation is not possible between two views because the resolution of a left image is different from that of the corresponding right image. So, we propose a disparity estimation method to make use of full information of the left reference image without down-sampling. In experimental result, we achieved
coding gain, compared with several conventional algorithms.
Edge-adaptive demosaicking method for complementary color filter array of digital video cameras
Han, Young-Seok ; Kang, Hee ; Kang, Moon-Gi ;
Journal of Broadcast Engineering, volume 13, issue 1, 2008, Pages 174~184
DOI : 10.5909/JBE.2008.13.1.174
Complementary color filter array (CCFA) is widely used in consumer-level digital video cameras, since it not only has high sensitivity and good signal-to-noise ratio in low-light condition but also is compatible with the interlaced scanning used in broadcast systems. However, the full-color images obtained from CCFA suffer from the color artifacts such as false color and zipper effects. These artifacts can be removed with edge-adaptive demosaicking (ECD) approaches which are generally used in rrimary color filter array (PCFA). Unfortunately, the unique array pattern of CCFA makes it difficult that CCFA adopts ECD approaches. Therefore, to apply ECD approaches suitable for CCFA to demosaicking is one of the major issues to reconstruct the full-color images. In this paper, we propose a new ECD algorithm for CCFA. To estimate an edge direction precisely and enhance the quality of the reconstructed image, a function of spatial variances is used as a weight, and new color conversion matrices are presented for considering various edge directions. Experimental results indicate that the proposed algorithm outperforms the conventional method with respect to both objective and subjective criteria.