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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 15, Issue 6 - Nov 2010
Volume 15, Issue 5 - Sep 2010
Volume 15, Issue 4 - Jul 2010
Volume 15, Issue 3 - May 2010
Volume 15, Issue 2 - Mar 2010
Volume 15, Issue 1 - Jan 2010
Selecting the target year
Human Factor Research on the Measurement of Subjective Three Dimensional Fatigue
Li, Hyung-Chul O. ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 607~616
DOI : 10.5909/JBE.2010.15.5.607
The methods developed to measure visual fatigue so far are quite few and lack of validity, and more importantly, they do not figure out the complex properties of the visual fatigue. The purpose of the research was to analyze the factors comprising the visual fatigue and to develop the method to measure it validly. The results are summarized as follows. First, we found that the 3D visual fatigue was comprised of four independent factors (visual stress, eye pain, body pain and image blurring factors). Second, we developed 29 items that measure four factors of 3D visual fatigue. Finally, the watching duration and binocular disparities affected the visual fatigue as had been expected. These results imply that the developed method does measure the three dimensional fatigue validly.
Adaptive Rate-Distortion Optimized Multiple Loop Filtering Algorithm
Hong, Soon-Gi ; Choe, Yoon-Sik ; Kim, Yong-Goo ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 617~630
DOI : 10.5909/JBE.2010.15.5.617
At 37th VCEG meeting in Jan. 2009, Toshiba proposed Quadtree-based Adaptive Loop Filter (QALF). The basic concept of QALF is to apply Wiener filter to decoded image after the conventional deblocking filter and to represent the filter on/off flag data for each basic filtering unit in a more efficient way of quadtree structure. QALF could enhance the compression performance of around more than 9%, but the structure of one filter for a decoded frame leaves room for further improvement in the sense that optimal filter for one region of a frame could quite different from the optimal filter for other parts of a picture. This paper proposes multiple adaptive loop filters for better utilization of local characteristics of decoded frame to optimize the region-based Wiener filters. Additional filters, proposed in this paper, cover separate spatial area of each decoded frame according to the performance of previously designed filter(s) to provide the flexibility of rate-distortion based selection of the number of filters.
The Development of the Bi-directionally Personalized Broadcasting and the Targeting Advertisement System Based on the User Profile Techniques
Shin, Sa-Im ; Lee, Jong-Soel ; Jang, Se-Jin ; Lee, Soek-Pil ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 632~641
DOI : 10.5909/JBE.2010.15.5.632
This paper shows the research about the personalized broadcasting system. The personalized broadcasting is the service that users only show the programs which they want to watch when they want to watch these. The purpose of the bi-directional broadcasting service is supporting more satisfied and more personalized services by permitting the bi-directional data transformation. This research also develops the user profiling system for the bi-directional and personalized broadcasting service. This system applied the TV-Anytime metadata specifications which is the standard for the personalized broadcasting services, the system supports the various functions for the bi-directionl and personalized broadcasting such as the user profiling, contents metadata and targeting advertisement services. The bi-directional and personalized broadcasting system increases the users' satisfaction with the recommendation and management of the personally favorite broadcasting contents and advertisements, the trial run results show that the services raise the users' satisfaction with the intelligent and discriminating broadcasting services.
Distributed Video Coding Based on Selective Block Encoding Using Feedback of Motion Information
Kim, Jin-Soo ; Kim, Jae-Gon ; Seo, Kwang-Deok ; Lee, Myeong-Jin ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 642~652
DOI : 10.5909/JBE.2010.15.5.642
Recently, DVC (Distributed Video Coding) techniques are drawing a lot of interests as one of the future research works to achieve low complexity encoding in various applications. But, due to the limited computational complexity, the performances of DVC algorithms are inferior to those of conventional international standard video coders, which use zig-zag scan, run length code, entropy code and skipped macroblock. In this paper, in order to overcome the performance limit of the DVC system, the distortion for every block is estimated when side information is found at the decoder and then we propose a new selective block encoding scheme which provides the encoder side with the motion information for the highly distorted blocks and then allows the sender to encode the motion compensated frame difference signal. Through computer simulations, it is shown that the coding efficiency of the proposed scheme reaches almost that of the conventional inter-frame coding scheme.
Efficient Entropy Coding Method for Scalable Video Coding
Choi, Hyo-Min ; Nam, Jung-Hak ; Sim, Dong-Gyu ; Choi, Byeong-Doo ; Cho, Dae-Sung ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 653~664
DOI : 10.5909/JBE.2010.15.5.653
Generally existing video codec employs entropy coding to deal with residual signals with considering temporal and spatial properties. Scalable Video Coding(SVC) which is extension of H.264/AVC has three technical concepts for removing redundancies between inter-layers. In spite of using novel prediction method between inter-layers in SVC, it is still using same entropy coding method to residual signals. According to the studies, the residual obtained by inter-layer prediction technique has different features of residual signal acquired by spatial or temporal prediction technique. In this paper, we propose an efficient entropy coding method which codes the residual signal obtained by inter-layer prediction with regarding its features adequately. We re-designed the Coded Block Pattern(CBP) table suitably for inter-layer texture prediction. The experiments show that the proposed method can further reduce the BD-Bitrate up to average 2.20% in 4CIF and 1.14% in CIF resolution compared to the existing JSVM 9.18.
Performance Analysis of DVB-T2 Turbo Equalization with LDPC and MAP Detector
Tai, Qing Song ; Han, Dong-Seog ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 665~671
DOI : 10.5909/JBE.2010.15.5.665
In this paper, a turbo equalizer is proposed for the digital video broadcasting for terrestrial - 2nd generation (DVB-T2) system. The proposed turbo equalizer is consisted with the maximum a posteriori (MAP) and low density parity check (LDPC) decoder. The channel information for the soft-input-soft-output (SISO) MAP equalizer is based on the least square (LS) channel estimator. The performance is analyzed through computer simulations in terms of the iteration number.
Adaptive Selection of Weighted Quantization Matrix for H.264 Intra Video Coding
Cho, Jae-Hyun ; Cho, Suk-Hee ; Jeong, Se-Yoon ; Song, Byung-Cheol ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 672~680
DOI : 10.5909/JBE.2010.15.5.672
This paper presents an adaptive quantization matrix selection scheme for H.264 video encoding. Conventional H.264 coding standard applies the same quantization matrix to the entire video sequence without considering local characteristics in each frame. In this paper, we propose block adaptive selection of quantization matrix according to edge directivity of each block. Firstly, edge directivity of each block is determined using intra prediction modes of its spatially adjacent blocks. If the block is decided as a directional block, new weighted quantization matrix is applied to the block. Otherwise, conventional quantization matrix is used for quantization of the non-directional block. Since the proposed weighted quantization is designed based on statistical distribution of transform coefficients in accordance with intra prediction modes, we can achieve high coding efficiency. Experimental results show that the proposed scheme can improve coding efficiency by about 2% in terms of BD bit-rate.
A Modification of ATSC Transmission System for Terrestial 3D HDTV Broadcasting
Oh, Jong-Gyu ; Kim, Joon-Tae ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 681~696
DOI : 10.5909/JBE.2010.15.5.681
In this paper, we examined the possibility of the transmission capacity increase by an extension and a modification of ATSC 8-VSB transmission system for broadcasting a 3D HDTV services through 6 MHz terrestrial channel. First we examined the performance and the limit of conventional ATSC 8-VSB transmission system. After that LDPC & BCH code are employed instead of conventional RS & TCM code and the transmission parameter is founded for the capacity increase with resonable TOV by varying the code-rates and increasing the modulation constellation. We do not consider the perfect backward compatibility for maximum transmission capacity increase like DVB-S2 system.
In-Loop Selective Decontouring Algorithm in Video Coding
Yoo, Ki-Won ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 697~702
DOI : 10.5909/JBE.2010.15.5.697
Contour artifact is known as the unintentional result of quantizing a flat area that has smooth gradients. In this letter, a decontouring algorithm is proposed to efficiently remove false contours that occur in typical block-based video coding applications. First, the algorithm goes through a refinement stage to determine candidate blocks probably having noticeable false contours with different kinds of features in a block. Then, pseudo-random noise masking is applied to those blocks to mitigate the contour artifacts. This block-based selective decontouring can efficiently remove the unnecessary processing of those blocks that have no false contour, which incidentally ensures a minor penalty in visual quality and computational complexity. The proposed algorithm was demonstrated, integrated into H.264/AVC, that visual quality can be significantly enhanced with an ignorable rate-distortion (RD) loss and an minor increase in computational complexity.
Depth compression method for 3D video
Nam, Jung-Hak ; Hwang, Neung-Joo ; Cho, Gwang-Shin ; Sim, Dong-Gyu ; Lee, Soo-Youn ; Bang, Gun ; Hur, Nam-Ho ;
Journal of Broadcast Engineering, volume 15, issue 5, 2010, Pages 703~706
DOI : 10.5909/JBE.2010.15.5.703
Recently, a need to encode a depth image has been raising with the deployment of 3D video services. The 3DV/FTV group in the MPEG has standardized the compression method of depth map image. Because conventional depth map coding methods are independently encoded without referencing the color image, coding performance of conventional algorithms is poor. In this letter, we proposed a novel method which rearranged modes of depth blocks according to modes of corresponding color blocks by using a correlation between color and depth images. In experimental results, the proposed method achieves bits reduction of 2.2% compared with coding method based on JSVM.