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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 10, Issue 4 - Dec 2005
Volume 10, Issue 3 - Sep 2005
Volume 10, Issue 2 - Jun 2005
Volume 10, Issue 1 - Mar 2005
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A Study on Adaptive GOP Structure for SVC
Jeong, Se-Yoon ; Park, Min-Woo ; Park, Gwang-Hoon ; Kim, Kyeu-Heon ; Hong, Jin-Woo ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 463~473
In this paper, we propose Adaptive GOP Structure to enhance the coding performance of scalable video coding in JVT. Adaptive GOP Structure considers temporal variances of video sequence. In general, SVC encodes a video sequence with fixed GOP size. The coding performance is varying according to the temporal variance of a video sequence. Thus, Adaptive GOP Structure method is proposed. It selects GOP size adaptively by considering temporal variance of video sequence. In the experiments, the propose method showed the enhanced coding performance in most sequences. The PSNR gain of Crew sequence is up to 0.63 dB.
The Development of Real-time Video Associated Data Service System for T-DMB
Kim Sang-Hun ; Kwak Chun-Sub ; Kim Man-Sik ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 474~487
T-DMB (Terrestrial-Digital Multimedia Broadcasting) adopted MPEG-4 BIFS (Binary Format for Scene) Core2D scene description profile and graphics profile as the standard of video associated data service. By using BIFS, we can support to overlay objects, i.e. text, stationary image, circle, polygon, etc., on the main display of receiving end according to the properties designated in broadcasting side and to make clickable buttons and website links on desired objects. Therefore, a variety of interactive data services can be served by BIFS. In this paper, we implement real-time video associated data service system far T-DMB. Our developing system places emphasis on real-time data service by user operation and on inter-working and stability with our previously developed video encoder. Our system consists of BIFS Real-time System, Automatic Stream Control System and Receiving Monitoring System. Basic functions of our system are designed to reflect T-DMB programs and characteristics of program production environment as a top priority. Our developed system was used in BIFS trial service via KBS T-DMB, it is supposed to be used in T-DMB main service after improvement process such as intensifying system stability.
Efficient Bitrate Control Scheme for Scalable Video Codec
Park Nae-Ri ; Jeon Dong-San ; Kim Jae-Gon ; Han Jong-Ki ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 488~504
In this paper, we propose a new bitrate control scheme to improve the quality of image encoded by SVC and to resolve the problems of conventional scheme. In JSVM2.0, bitrate of a frame is controlled by an initial quantization parameter and scaling factor that it hasdifferent value according to frame. Itis difficult to get the best of video quality at arbitrary bitrate because the conventional scheme has two defects. One is that we have to know proper initial QP's fur all sequences. Another is that QP's control skill for macroblocks is very inefficient. In this paper, we propose an efficient bit allocation algorithm to reduce the effect of the initial QP and to increase the efficiency of bit allocation by using proper QP's for macroblocks. In simulation results, it can be seen that using the proposed scheme enables the SVC encoder to control the bitrate by the macroblock unit and outperforms the conventional schemes in the respect of rate-distortion.
Efficient Image Upsampling using Frequency Resolution Expansion Schemes in DCT Domain
Park Seung-Wook ; Park Ji-Ho ; Jeon Byeong-Moon ; Park Hyun Wook ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 505~514
Image upsampling can be performed in both spatial and frequency (transform) domain. In the spatial domain, various upsampling techniques are developed and 6-tap FIR interpolation filter is most well known method, which is embedded in many video coding standards. It can provide high subjective quality but shows low objective quality. In the transform domain, simple zero padding method can produce upsampled image easily. It shows better objective quality than 6-tap filtering, but it yields ringing effects which annoy eyes. In this paper, we present efficient upsampling method using frequency addition method in transform domain to provide better subjective and objective quality than conventional method Extensive simulation results show that the proposed algorithm produces visually fine images with high PSNR.
Overview of H.264/AVC Scalable Extension
Park Seong-ho ; Kim Wonha ; Han Woo-jin ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 515~527
A next-generation codec should be developed to be a scalable video codec(SVC) that not only maximizes the coding efficiency but also adaptively copes with the various communication devices and the variation of network environments. To meet these requirements, Joint Video Team (JVT) of ISO/IEC and ITU-T is standardizing H.264/AVC based SVC. In this paper, we introduce research directions and status on SVC standardization and also analyze techniques and algorithms adopted in the current SVC.
Motion Estimation and Mode Decision Algorithm for Very Low-complexity H.264/AVC Video Encoder
Yoo Youngil ; Kim Yong Tae ; Lee Seung-Jun ; Kang Dong Wook ; Kim Ki-Doo ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 528~539
The H.264 has been adopted as the video codec for various multimedia services such as DMB and next-generation DVD because of its superior coding performance. However, the reference codec of the standard, the joint model (JM) contains quite a few algorithms which are too complex to be used for the resource-constraint embedded environment. This paper introduces very low-complexity H.264 encoding algorithm which is applicable for the embedded environment. The proposed algorithm was realized by restricting some coding tools on the basis that it should not cause too severe degradation of RD-performance and adding a few early termination and bypass conditions during the motion estimation and mode decision process. In case of encoding of 7.5fps QCIF sequence with 64kbpswith the proposed algorithm, the encoder yields worse PSNRs by 0.4 dB than the standard JM, but requires only
of computational complexity and lowers the required memory and power consumption drastically. By porting the proposed H.264 codec into the PDA with Intel PXA255 Processor, we verified the feasibility of the H.264 based MMS(Multimedia Messaging Service) on PDA.
An Equalization Technique of Dual-Feedback Structure in ATSC DTV Receivers
Oh, Young-Ho ; Kim, Dae-Jin ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 540~547
In the DFE(Decision Feedback Equalizer) for ATSC DTV receivers, there are decision errors in the slicer or. the simplified trellis decoder, and these decided false data comes to the feedback filter to make the error propagation phenomenon. The error propagation degrades the equalizer performance by increasing residual errors as well as slowing down the convergence rate. In this paper we propose a dual-feedback equalization structure. There are two feedback filters. One is the decision feedback filter which uses the simplified trellis decoder output data, the other is non-decision feedback filter which uses the equalizer output data. The additional non-decision feedback filter doesn't introduce the error propagation, so it can compensate the error propagation. The proposed structure accelerates the convergence rate as well as reduces output men-square error(MSE). We analyzed the performance enhancement of DTV receiver using dual-feedback equalization structure.
Network-Adaptive Transport Error Control for Reliable Wireless Media Transmission
Lee Chul-Ho ; Choi Jeong-Yong ; Kwon Young-Woo ; Kim Jongwon ; Shin Jitae ; Jeon Dong-San ; Kim Jae-Gon ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 548~556
In wireless network environments, wireless channels are characterized by time-varying fading and interference conditions, which may lead to burst packet corruptions and delay variation. This can cause severe quality degradation of streaming media. To guarantee successful transmission of media over the hostile wireless networks, where channel conditions are highly fluctuating, a flexible and network-adaptive transport method is required. Thus, we propose a network-adaptive transport error control consisting of packet-level interleaved FEC and delay-constrained ARQ, which acts as an application-level transport method of streaming media to alleviate burst packet losses while adapting to the changing channel condition in wireless networks. The performances of the proposed network-adaptive transport error control, general error control schemes, and hybrid schemes are evaluated by a developed simulator at the transport-level and video quality of streaming media. Simulation results show that the proposed mechanism provides the best overall performance among compared other schemes in terms of the transport-level performance of error control and the performance of video quality for streaming media.
TV Anytime and MPEG-21 DIA based Ubiquitous Consumption of TV Contents in Digital Home Environment
Kim Munjo ; Yang Chanseok ; Lim Jeongyeon ; Kim Munchurl ; Park Sungjin ; Kim Kwanlae ; Oh Yunje ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 557~575
Much research in core technologies has been done to make it possible the ubiquitous video services over various kinds of user information terminals anytime anywhere in the way the users want to consume. In this paper, we design plototypesystem architecture for the ubiquitous TV program content consumption based on user preference via various kinds of intelligent information terminals in digital home environment, and present an implementation and testing results for the prototype system. For the system design, we utilize the TV Anytime specification fur the consumption of TV program contents based on user preference in TV programs, and also use the MPEG-21 DIA (Digital Item Adaptation) tools which are the representation schema formats in order to describe the context information for user environments, user terminal characteristics, user characteristics for universal access and consumption of the preferred TV program contents. The proposed ubiquitous content mobility prototype system is designed to make it possible to seamlessly consume contents by a single user or multiple users via various kinds of user terminals for the TV program contents they watch together. The proposed ubiquitous content mobility prototype system in digital home environment consists of a home server, a display TV terminal, and an intelligent information terminal. We use 42 TV programs contents in eight different genres from four different TV channels in order to test our prototype system.
Study on the estimation and representation of disparity map for stereo-based video compression/transmission systems
Bak Sungchul ; Namkung Jae-Chan ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 576~586
This paper presents a new estimation and representation of a disparity map for stereo-based video communication systems. Several pixel-based and block-based algorithms have been proposed to estimate the disparity map. While the pixel-based algorithms can achieve high accuracy in computing the disparity map, they require a lost of bits to represent the disparity information. The bit rate can be reduced by the block-based algorithm, sacrificing the representation accuracy. In this paper, the block enclosing a distinct edge is divided into two regions and the disparity of each region is set to that of a neighboring block. The proposed algorithm employs accumulated histograms and a neural network to classify a type of a block. In this paper, we proved that the proposed algorithm is more effective than the conventional algorithms in estimating and representing disparity maps through several experiments.
Application of Digital On-Channel Repeater in a DTV Transmission Network in Korea
Suh Young-Woo ; Kim Young-Min ; Mok Ha-Kyun ; Kwon Tae-Hoon ; Lee Sang-Gil ; Park Sung Ik ; Lee Yong-Tae ; Eum Homin ; Seo Jae Hyun ; Kim Heung Mook ; Kim Seung Won ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 587~598
KBS and ETRI have co-developed an advanced DOCR(Digital On Channel Repeater) which has an equalization and pre-distortion function and can be operated properly under lower isolation of reception and transmission antennas. Field tests of the DOCR were performed twice in Suwon area in 2004 and 2005. This paper summarizes the characteristics of the DOCR system and field test results in Suwon. The changes in DOCR coverage according to the different generations of ATSC DTV receivers were also analyzed. Basic concept to apply the DOCR system in DTV broadcasting networks in Korea is suggested through test results.
Development of an Integrated Measurement and Analysis System for DTV Field Test
Kim Young-Min ; Suh Young-Woo ; Mok Ha-Kyun ; Kwon Tae-Hoon ; Lee Sang-Gil ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 599~609
There are many test parameters in the DTV measurement, which uses several test measuring instruments and miscellaneous devices. To operate all of those devices and analyse test results is a tedious and time-consuming process with a high error rate committed by inexperienced test crews. In this paper, we propose an integrated DTV measurement and analysis system(IMAS) that remotely controls and manages any instruments with standard network interface. This system can take, organize, store the field data into an integrated database and easily produce systematic output according to user-defined form. It can also measure several types of digital broadcasting signals such as DTV, DMB, DAB with generalized measurement procedures. Proposed measurement system was applied in the DTV field test by KBS and proved that it could enhance the accuracy and efficiency of entire test sequences and also dramatically reduce measurement time compared to conventional measurement systems.
Factors Affecting Intent to Use of T-Commerce in Enhanced TV Programs in Case of e-Commerce Users - The Moderating Effect of User Innovativeness
Suh Hyunju ; Moon Nam-Mee ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 610~620
The current study investigates factors affecting intent to use of T-Commerce in enhanced TV programs. from the perspective of e-commerce users who have experienced terrestrial data broadcasting services. The research model hypothesizes the relationship among independent variables such as perceived usefulness, perceived ease of use, and the dependent variable, intent to use of T-Commerce. In addition, the moderating effect of user innovativeness is also analyzed. The results reveal the significant and positive relationship between perceived usefulness of e-commerce and intent to use of T-Commerce. Besides, the moderating role of user innovativeness is confined to the effect of the perceived usefulness on intent of use of T-Commerce. The findings of this study provide an implication that customer attracting strategies for potential T-Commerce users have to be differentiated based on the status in the T-Commerce development process.
Multi-view video coding using efficient disparity vector prediction
Kim, Yong-Tae ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 621~631
To enhance the performance of multi-view sequence CODEC, an efficient disparity vector coding method fur multiview sequences is proposed herein. For higher coding efficiency, we encode the differential vectors acquired by subtracting the original vectors from the predicted ones. To enhance the performance of disparity vector coding, it is essential to predict the disparity vectors accurately. The prediction by this proposed method utilizes the correlation among the multiview images, while conventional methods exploit the correlation among the causal blocks. Experiments were performed fur three different 5 view sequences. We were able to confirm that the proposed method predicts disparity vectors accurately by comparing the entropy and the mean absolute values for differential vectors with conventional methods. Its performance is superior to vector coding methods used in MPEG-4 which uses only a spatial correlation. The proposed method increases the coding efficiency by a factor of
while preserving image quality.
Vertex selection method considering texture degradation for contour approximation
Choi Jae Gark ; Lee Si-Woong ; Koh Chang-Rim ; Lee Jong-Keuk ;
Journal of Broadcast Engineering, volume 10, issue 4, 2005, Pages 632~642
This paper presents a new vertex selection scheme for the polygon-based contour approximation. In the proposed method, the entire contour is partitioned into partial segments and they are approximated adaptively with variable accuracy. The approximation accuracy of each segment is controlled based on its relative significance. By computing the relative significance with the texture degradation in the approximation error region, the visual quality enhancement in the reconstructed frames can be achieved under the same amount of the contour data. For this purpose, a decision rule for
is derived based on inter-region contrasts. In addition, an adaptive vertex selection method using the derived rule is proposed. Experimental results are presented to show the superiority of the proposed method over conventional methods.