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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 12, Issue 6 - Nov 2007
Volume 12, Issue 5 - Sep 2007
Volume 12, Issue 4 - Jul 2007
Volume 12, Issue 3 - May 2007
Volume 12, Issue 2 - Mar 2007
Volume 12, Issue 1 - Jan 2007
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Overview and Performance Analysis of the Emerging Scalable Video Coding
Choi, Hae-Chul ; Lee, Kyung-Il ; Kang, Jung-Woo ; Bae, Seong-Jun ; Yoo, Jeong-Ju ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 542~554
DOI : 10.5909/JBE.2007.12.6.542
Seamless streaming of multimedia content via heterogeneous networks to viewers using a variety of devices has been a desire for many multimedia services, for which the multimedia contents should be adapted to usage environments such as network characteristics, terminal capabilities, and user preferences. Scalability in video coding is one of attractive features to meet dynamically changing requirements of heterogeneous networks. Currently a new scalable video coding (SVC) is standardizing in the Joint Video Team (JVT) of the ISO/IEC Moving Picture Experts Group (MPEG) and the ITU-T Video Coding Experts Group (VCEG), which will be released as Extension 3 of H.264/MPEG-4 AVC. In this paper, we introduce new technologies of SVC and evaluate performance of it especially regarding on overhead bit-rate and coding efficiency to support spatial, temporal, and quality scalability.
Analysis of Statistical Properties of Propagation Errors in DCT Coefficient-Dropping Transcoder
Kim, Jin-Soo ; Kim, Jae-Gon ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 555~564
DOI : 10.5909/JBE.2007.12.6.555
Discrete cosine transform (DCT) coefficient dropping is well recognized as an efficient rate adaptation transcoding in motion-compensated (MC)-DCT based MPEG-compressed videos. However, in this scheme, the errors incurred by the DCT coefficient-dropping are propagated and often result in significant visual quality degradation. This paper presents two propositions describing well the statistical properties of propagated errors. That is, we propose that the DCT error of the current frame is not correlated to the propagated errors of the previous frames. We also propose that the overall distortions in a given frame can be approximated as the sum of the DCT error of the current frame and the propagated errors from the previous frames. Then, it is shown that several computer simulations with different video sequences verify the effectiveness of the proposed statistical analyses.
Motion Vector Predictor selection method for multi-view video coding
Choi, Won-Jun ; Suh, Doug-Young ; Kim, Kyu-Heon ; Park, Gwang-Hoon ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 565~573
DOI : 10.5909/JBE.2007.12.6.565
In this paper, we propose a method to select motion vector predictor by considering prediction structure of a multi view content for coding efficiency of multi view coding which is being standardized in JVT. Motion vector of a different tendency is happened while carrying out temporal and view reference prediction of multi-view video coding. Also, due to the phenomena of motion vectors being searched in both temporal and view order, the motion vectors do not agree with each other resulting a decline in coding efficiency. This paper is about how the motion vector predictor are selected with information of prediction structure. By using the proposed method, a compression ratio of the proposed method in multi-view video coding is increased, and finally
dB PSNR(Peak Signal-to-Noise Ratio) improvement was obtained compared with the case of JMVM 3.6 method.
Frame Bit-rate Control Method for Low Delay Video Communication
Jin, En-Ji ; Park, Min-Cheol ; Moon, Joo-Hee ; Kwon, Jae-Cheol ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 574~584
DOI : 10.5909/JBE.2007.12.6.574
As the real time multimedia service become more popular, the needs of transmission with low delay and high quality are getting more stronger. Among those video compression technologies, the rate control method dose an important role in getting the effective data transmitting and the high image quality. In this paper, we combined the feature of CBR and VBR coding methods to propose a new bit-rate control method witch allows each frame to generates bits in the defined fluctuation range and applies a scene change detection at a part of frame and also can maintain low-delay and high quality even if the perfect VBR transmission environment is not guaranteed. The experiment result shows the proposed algorithm provides more effective method than TMN8 in real time application.
A study on performance evaluation of DVCs with different coding method and feasibility of spatial scalable DVC
Kim, Dae-Yeon ; Park, Gwang-Hoon ; Kim, Kyu-Heon ; Suh, Doug-Young ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 585~595
DOI : 10.5909/JBE.2007.12.6.585
Distributed video coding is a new video coding paradigm based on Slepian-Wolf and Wyner-Ziv`s information theory Distributed video coding whose decoder exploits side information transfers its computational burden from encoder to decoder, so that encoding with light computational power can be realized. RD performance is superior than that of standard video coding without motion compensation process but still has a gap with that of coding with motion compensation process. This parer introduces basic theory of distributed video coding and its structure and then shows RD performances of DVCs whose coding style is different from each other and of a DVC as a spatial scalable video coder.
Selective Inter-layer Residual Prediction Coding and Fast Mode Decision for Spatial Enhancement Layers in Scalable Video Coding
Lee, Bum-Shik ; Hahm, Sang-Jin ; Park, Chang-Seob ; Park, Keun-Soo ; Kim, Mun-Churl ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 596~610
DOI : 10.5909/JBE.2007.12.6.596
In order to reduce the complexity of SVC encoding, we introduce a fast mode decision method in the enhancement layers of spatial scalability by selectively performing the inter-layer residual prediction of SVC. The Inter-layer residual prediction coding in Scalable Video Coding has a large advantage of enhancing the coding efficiency since it utilizes the correlation between two residuals from a lower spatial layer and its next higher spatial layer. However, this entails the dramatical increase in the complexity of SVC encoders. The proposed method is to analyze the characteristics of integer transform coefficients for the subtracted signal for two residuals from lower and upper spatial layers. Then it selectively performs the inter-layer residual prediction coding and rate-distortion optimizations in the upper spatial enhancement layer if the SAD values of residuals exceed adaptive threshold values. Therefore, by classifying the residuals according to the properties of integer-transform coefficients only with SAD of residuals between two layers, the SVC encoder can perform the inter-layer residual coding selectively, thus significantly reducing the total required encoding time. The proposed method results in reduction of the total encoding time with 51.5% in average while maintaining the RD performance with negligible amounts of quality degradation.
An Intra Prediction Method and Fast Intra Prediction Method in Inter Frames using Block Content and Dependency Probabilities on neighboring Block Modes in H.264|AVC
Na, Tae-Young ; Lee, Bum-Shik ; Hahm, Sang-Jin ; Park, Chang-Seob ; Park, Keun-Soo ; Kim, Mun-Churl ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 611~623
DOI : 10.5909/JBE.2007.12.6.611
The H.264|AVC standard incorporates an intra prediction tool into inter frame coding. However, this leads to excessive amount of increase in encoding time, thus resulting in the difficulty in real-time implementation of software encoders. In this paper, we first propose an early decision on intra prediction coding and a fast intra prediction method using the characteristics of block contents and the context of neighboring block modes for the intra prediction in the inter frame coding of H.264/AVC. Basically, the proposed methods determine a skip condition on whether the
intra prediction is to be used in the inter frame coding by considering the content characteristics of each block to be encoded and the context of its neighboring blocks. The performance of our proposed methods is compared with the Joint Model reference software version 11.0 of H.264|AVC. The experimental results show that our proposed methods allow for 41.63% reduction in the total encoding time with negligible amounts of PSNR drops and bitrate increases, compared to the original Joint Model reference software version 11.0.
Global Disparity Compensation for Multi-view Video Coding
Oh, Kwan-Jung ; Ho, Yo-Sung ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 624~629
DOI : 10.5909/JBE.2007.12.6.624
While single view video coding uses the temporal prediction scheme, multi-view video coding (MVC) applies both temporal and inter-view prediction schemes. Thus, the key problem of MVC is how to reduce the inter-view redundancy efficiently, because various existing video coding schemes have already provided solutions to reduce the temporal correlation. In this paper, we propose a global disparity compensation scheme which increases the inter-view correlation and a new inter-view prediction structure based on the global disparity compensation. By experiment, we demonstrate that the proposed global disparity compensation scheme is less sensitive to change of the search range. In addition, the new Inter-view prediction structure achieved about
quality improvement compared to the reference software.
Design of T-DMB Automatic Emergency Alert Service Standard: Part 2 Service Model, Transport Channel, and Service Signaling
Choi, Seong-Jong ; Kwon, Dae-Bok ; Kim, Jae-Yeon ; Oh, Keon-Sik ; Chang, Tae-Uk ; Hahm, Young-Kwon ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 630~640
DOI : 10.5909/JBE.2007.12.6.630
This paper presents the design of service model, transport channel, and service signaling for the Terrestrial DMB Automatic Emergency Alert Service (AEAS) Standard. The paper begins with the analysis of technical backgrounds related to the design topics. Next, the raper presents the design of service model for the AEAS. Since, unlike the regular T-DMB services, the AEAS is event-driven and common to all services, some problems have been identified to design a service model conforming to the T-DMB standard. So, the paper proposes a new concept, called the common service, and the AEAS is modeled using the common service. Next, in order to decide the transport channel for the alert information, the paper proposes to divide the alert information into the message which contains code/text-based essential information, and the supplemental multimedia information. Then, the paper tries to find the most efficient transport channels. Emergency Warning Service (EWS) which uses FIG 5/2 is selected for the delivery of the message. The paper proposes no constraints on delivery of supplemental information except that it shall use the MSC. Finally, it proposes the service signaling for the common service and transport channel. Due to the problems of conventional signaling using the MCI, it proposes a new signaling method. The paper will contribute as a guideline to the development for emergency alert service standards fur other broadcasting media.
A recursive trellis decoder using feedback data in ATSC DTV receivers
Oh, Young-Ho ; Lee, Kyoung-Won ; Kim, Dae-Jin ;
Journal of Broadcast Engineering, volume 12, issue 6, 2007, Pages 641~648
DOI : 10.5909/JBE.2007.12.6.641
The decoding structure of up-to-date ATSC DTV receivers is well optimized, and it seems that 14.6 dB is the unbreakable minimum SNR in the AWGN channel. But the SNR satisfying the Shannon capacity of DTV receivers is 11.76 dB, So, the SNR gab between the 14.6 dB and the 11.76 dB is about 2.8 dB. In order to approach the Shannon capacity we propose a recursive trellis decoder which uses reliable feedback data obtained by an RS decoder. The performance enhancement of about 0.8 dB can be achieved in case of the AWGN channel.