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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 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
Analysis of Characteristics of White LED Light Source for TV Lighting
Lee, Kook-Se ; Moon, Nam-Mee ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 461~473
DOI : 10.5909/JBE.2010.15.4.461
Since eco friendly and power saving products recently got into the limelight for the protection of environment, LED light technology has caught much of attention as the next generation broadcasting lighting. The newly introduced light source has such advantages as higher efficiency, longer life and its slim and compact forms leading to conveniency in installations. When combined with digital light control it gives more dynamic and various features to lighting. In this paper, used CIE standard for measuring light sources by their purposes and forms to make a comparative analysis of spectral distribution and color rendition of LED light source to those of existing lighting systems. By means of the cast shadowing and color reproduction tests I also tried to figure out the effects of LED lighting design on TV visuals where higher quality is crucial with the audience's increasing demands for quality image.
Moving Object Contour Detection Using Spatio-Temporal Edge with a Fixed Camera
Kwak, Jae-Ho ; Kim, Whoi-Yul ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 474~486
DOI : 10.5909/JBE.2010.15.4.474
In this paper, we propose a new method for detection moving object contour using spatial and temporal edge. In general, contour pixels of the moving object are likely present around pixels with high gradient value along the time axis and the spatial axis. Therefore, we can detect the contour of the moving objects by finding pixels which have high gradient value in the time axis and spatial axis. In this paper, we introduce a new computation method, termed as temporal edge, to compute an gradient value along the time axis for any pixel on an image. The temporal edge can be computed using two input gray images at time t and t-2 using the Sobel operator. Temporal edge is utilized to detect a candidate region of the moving object contour and then the detected candidate region is used to extract spatial edge information. The final contour of the moving object is detected using the combination of these two edge information, which are temporal edge and spatial edge, and then the post processing such as a morphological operation and a background edge removing procedure are applied to remove noise regions. The complexity of the proposed method is very low because it dose not use any background scene and high complex operation, therefore it can be applied to real-time applications. Experimental results show that the proposed method outperforms the conventional contour extraction methods in term of processing effort and a ghost effect which is occurred in the case of entropy method.
Hard Handover by the Adaptive Time-to-trigger Scheme based on Adaptive Hysteresis considering the Load Difference between Cells in 3GPP LTE System
Jeong, Un-Ho ; Kim, Dong-Hoi ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 487~497
DOI : 10.5909/JBE.2010.15.4.487
In this paper, we propose a hard handover scheme which adaptively decides important handover parameters such as hysteresis and time-to-trigger values considering the load difference between the target and serving cells. First of all, the hysteresis value can be automatically adjusted according to the load difference, thus it is used to decide the handover trigger time. As a result, through the adaptive hysteresis scheme, handover drop rate is improved. However, this adaptive hysteresis scheme has a problem that the ping-pong effect, which occurs due to the frequent movement of mobile stations at the cell boundary, is increased. Therefore, to solve this problem, we propose a novel adaptive time-to-trigger scheme with the time-to-trigger which is in inverse proportion to the hysteresis value already established by the adaptive hysteresis scheme which adapts to the changing load difference between the target and serving cells. The simulation results show that the proposed adaptive time-to-trigger scheme based on the adaptive hysteresis is better than existing schemes in terms of handover drop rate and ping-pong generation.
Voting-based Intra Mode Bit Skip Using Pixel Information in Neighbor Blocks
Kim, Ji-Eon ; Cho, Hye-Jeong ; Jeong, Se-Yoon ; Lee, Jin-Ho ; Oh, Seoung-Jun ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 498~512
DOI : 10.5909/JBE.2010.15.4.498
Intra coding is an indispensable coding tool since it can provide random accessibility as well as error resiliency. However, it is the problem that intra coding has relatively low coding efficiency compared with inter coding in the area of video coding. Even though H.264/AVC has significantly improved the intra coding performance compared with previous video standards, H.264/AVC encoder complexity is significantly increased, which is not suitable for low bit rate interactive services. In this paper, a Voting-based Intra Mode Bit Skip (V-IMBS) scheme is proposed to improve coding efficiency as well as to reduce encoding time complexity using decoder-side prediction. In case that the decoder can determine the same prediction mode as what is chosen by the encoder, the encoder does not send that intra prediction mode; otherwise, the conventional H.264/AVC intra coding is performed. Simulation results reveal a performance increase up to 4.44% overall rate savings and 0.24 dB in peak signal-to-noise ratio while the frame encoding speed of proposed method is about 42.8% better than that of H.264/AVC.
De-blocking Filter for Improvement of Coding Efficiency and Computational Complexity Reduction on High Definition Video Coding
Jung, Kwang-Su ; Nam, Jung-Hak ; Jo, Hyun-Ho ; Sim, Dong-Gyu ; Oh, Seoung-Jun ; Jeong, Sey-Yoon ; Choi, Jin-Soo ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 513~526
DOI : 10.5909/JBE.2010.15.4.513
In this paper, we propose a de-blocking filter for improvement of coding efficiency and computational complexity reduction on a high definition video coding. Recently, the H.264/AVC standard-based research for high definition video coding method is under way because the amount of used of high definition videos is on the increase. The H.264/AVC de-blocking filter is designed for low bitrate video coding and it improves not only the subjective quality but also coding efficiency by minimizing the blocking artifact. However, the H.264/AVC de-blocking filter that strong filtering is performed is not suitable in a high definition video coding which occurs relatively low blocking artifact. Also, the conventional de-blocking filter has high computational complexity in decoder side. The computational complexity of the proposed method is reduced about maximum 8.8% than conventional method. Furthermore, the coding efficiency of the proposed method is about maximum 7.3% better than H.264/AVC de-blocking filter.
An adaptive frequency-selective weighted prediction of residual signal for efficient RGB video compression coding
Jeong, Jin-Woo ; Choe, Yoon-Sik ; Kim, Yong-Goo ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 527~539
DOI : 10.5909/JBE.2010.15.4.527
Most video coding systems use YCbCr color space for their inputs, but RGB space is more preferred in the field of high fidelity video because the compression gain from YCbCr becomes disappeared in the high quality operation region. In order to improve the coding performance of RGB video signal, this paper presents an adaptive frequency-selective weighted prediction algorithm. Based on the sign agreement and the strength of frequency-domain correlation of residual color planes, the proposed scheme adaptively selects the frequency elements as well as the corresponding prediction weights for better utilization of inter-plane correlation of RGB signal. Experimental results showed that the proposed algorithm improves the coding gain of around 13% bitrate reduction, on average, compared to the common mode of 4:4:4 video coding in the state-of-the-art video compression standard, H.264/AVC.
Fast Stereoscopic 3D Broadcasting System using x264 and GPU
Choi, Jung-Ah ; Shin, In-Yong ; Ho, Yo-Sung ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 540~546
DOI : 10.5909/JBE.2010.15.4.540
Since the stereoscopic 3-dimensional (3D) video that provides users with a realistic multimedia service requires twice as much data as 2-dimensional (2D) video, it is difficult to construct the fast system. In this paper, we propose a fast stereoscopic 3D broadcasting system based on the depth information. Before the transmission, we encode the input 2D+depth video using x264, an open source H.264/AVC fast encoder to reduce the size of the data. At the receiver, we decode the transmitted bitstream in real time using a compute unified device architecture (CUDA) video decoder API on NVIDIA graphics processing unit (GPU). Then, we apply a fast view synthesis method that generates the virtual view using GPU. The proposed system can display the output video in both 2DTV and 3DTV. From the experiment, we verified that the proposed system can service the stereoscopic 3D contents in 24 frames per second at most.
Performance Analysis and Design of MIMO Systems for Terrestrial Transmission of UHDTV
Jo, Bong-Gyun ; Han, Dong-Seog ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 547~554
DOI : 10.5909/JBE.2010.15.4.547
In this paper, we propose transmission systems for ultra high definition television (UHDTV) through terrestrial transmission by applying the multi-input multi-output (MIMO) technology. The space time block code, hybrid STBC, V-BLAST and linear dis- persion code are considered to support a high data rate of the UHDTV system. The performance of proposed MIMO systems are evaluated through computer simulations. Then we suggest MIMO parameters, number of antennas and optimal transmission scheme to achieve the transmission rate of the UHDTV system.
Contents Scheduling Method for Push-VOD over Terrestrial DTV using Markov-Chain Modeling and Dynamic Programming Approach
Kim, Yun-Hyoung ; Lee, Dong-Jun ; Kang, Dae-Kap ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 555~562
DOI : 10.5909/JBE.2010.15.4.555
After starting digital terrestrial broadcasting, there have been a number oftrials to provide new services like data broadcasting on a spare bandwidth of a DTV channel. Recently, the Push-VOD service, which provides A/V contents on that bandwidth, gets more attention and is being standardized as NRT(Non-Real-Time) by ATSC. However, it is highly probable that the contents transmitted in this way contain many errors due to the DTV receiving environment. Thus, in order to improve the reliability of transmission, the contents should be transmitted repeatedly several times, considering the unidirectional property of DTV terrestrial network. In this paper, we propose a method to calculate the optimal number of repetitions to transmit each contents in a way that minimizes the number of errors occured, when trying to transmit several contents to the receiver in a restricted time, using Markov-chain modeling and dynamic programming approach.
Analysis on Subjective Image Quality Assessments for 4K-UHD Video Viewing Environments
Park, In-Kyung ; Ha, Kwang-Sung ; Kim, Mun-Churl ; Cho, Suk-Hee ; Cho, Jin-Soo ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 563~581
DOI : 10.5909/JBE.2010.15.4.563
In this paper, we perform subjective visual quality assessments on UHD video for UHD TV services and analyze the assessment results. Demands for video services have been increased with availabilities of DTV, Internet and personal media equipments. With this trend, the demands for high definition video have also been increasing. Currently, 2K-HD (
) video have been widely consumed over DTV, DVD, digital camcoders, security cameras and other multimedia terminals in various types, and recently digital cinema contents of 4K-UHD(
) have been popularly produced and the cameras, beam projects, display panels that support for 4K-UHD video start to come out into multimedia markets. Also it is expected that 4K-UHD service will appear soon in broadcasting and telecommunications environments. Therefore, in this paper, subjective assessments of visual quality on resolutions, color formats, frame rates and compression rates have been carried to provide basis information for standardization of signal specification of UHD video and viewing environments for future UHDTV. As the analysis on the assessments, UHD video exhibits better subjective visual quality than HD by the evaluators. Also, the 4K-UHD test sequences in YUV444 shows better subjective visual quality than the 4K-UHD test sequences in YUV422 and YUV420, but there is little perceptual difference on 4K-UHD test sequences between YUV422 and YUV420 formats. For the comparison between different frame rates, 4K-UHD test sequences of 60fps gives better subjective visual quality than those of 30fps. For bit-depth comparison, HD test sequences in 10-bit depth were little differentiated from those in 8-bit depth in subject visual quality assessment. Lastly, the larger the PSNR values of the reconstructed 4K-UHD test sequences are, the higher the subjective visual quality is. Against the viewing distances, the differences among encoded 4K-UHD test sequences were less distinguished in longer distances from the display.
Fast intra mode decision using DCT coefficient distribution in H.264/AVC
Hong, Sung-Wook ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 582~590
DOI : 10.5909/JBE.2010.15.4.582
he rate-distortion optimization (RDO) method in the H.264/AVC encoder is a technology that improves the coding efficiency, but increases the computational complexity. In this paper, a fast Intra mode decision algorithm using DCT (Discrete Cosine Transform) coefficients distribution is proposed to reduce the H.264 encoder complexity. The proposed method reduces the encoder complexity on average 68.40%, while the coding efficiency is slightly decreased compared with the H.264/AVC encoder.
Filtering for reducing aliasing effects on auto-multiscopic monitor
Park, Myung-Su ; Yoo, Ji-Sang ;
Journal of Broadcast Engineering, volume 15, issue 4, 2010, Pages 591~599
DOI : 10.5909/JBE.2010.15.4.591
In this paper, we propose a disparity-adaptive filtering method to reduce view-aliasing and inter-perspective aliasing on auto-multiscopic 3D display. View aliasing by the subsampled multi-view images could happen if the resolution of an auto-multiscopic monitor is lower than that of the original multi-view images. Furthermore, multi-view images on auto-multiscopic monitor usually cause eye strain and fatigue because of inter-perspective aliasing by discontinuity that exists between viewpoints. The greater disparity value becomes, the stronger these types of aliasing could be. Thus, we design a lowpass filter whose cut-off frequency is determined adaptively to the number of intermediate reconstructed views and their disparity's strength. Though experimental results, we show that the proposed filtering algorithm could reduce the aliasing effect very efficiently by using DSCQS (double stimulus continuous quality scale method).