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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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SNR Scalable Coding of 3-D Mesh Sequences Based on Singular Value Decomposition
Heu, Jun-Hee ; Kim, Chang-Su ; Lee, Sang-Uk ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 289~298
DOI : 10.5909/JBE.2008.13.3.289
We propose an SNR-scalable coding algorithm for three-dimensional mesh sequences based on singular value decomposition (SVD). SVD achieves a coding gain by representing a mesh sequence with a small number of basis vectors and singular values. First, we introduce a bit plane coding scheme and derive a quantitative relationship between each bit plane and the reconstructed image quality. Using the relationship, we develop a rate-distortion (RD) optimized coding algorithm. Moreover, we propose prediction techniques to exploit the spatio-temporal correlations in real mesh sequences. Simulation results demonstrate that the proposed algorithm provides significantly better RD performance than conventional SVD coders.
Model-Based Three-dimensional Multiview Object Implementation by OpenGL
Oh, Won-Sik ; Kim, Dong-Uk ; Kim, Hwa-Sung ; Yoo, Ji-Sang ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 299~309
DOI : 10.5909/JBE.2008.13.3.299
In this paper, we propose an algorithm for object generation from model-based 3-dimensional multi-viewpoint images using OpenGL rendering. In the first step, we preprocess a depth map image in order to get a three-dimensional coordinate which is sampled as a vertex information on OpenGL and has a z-value as depth information. Next, the Delaunay Triangulation algorithm is used to construct a polygon for texture-mapping using the vertex information. Finally, by mapping a texture image on the constructed polygon, we generate a viewpoint-adaptive object by calculating 3-dimensional coordinates on OpenGL.
Fast Intra-Mode Decision for H.264/AVC using Inverse Tree-Structure
Ko, Hyun-Suk ; Yoo, Ki-Won ; Seo, Jung-Dong ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 310~318
DOI : 10.5909/JBE.2008.13.3.310
The H.264/AVC standard achieves higher coding efficiency than previous video coding standards with the rate-distortion optimization (RDO) technique which selects the best coding mode and reference frame for each macroblock. As a result, the complexity of the encoder have been significantly increased. In this paper, a fast intra-mode decision algorithm is proposed to reduce the computational load of intra-mode search, which is based on the inverse tree-structure edge prediction algorithm. First, we obtained the dominant edge for each
block from local edge information, then the RDO process is only performed by the mode which corresponds to dominant edge direction. Then, for the
) block stage, the dominant edge is calculated from its four
) blocks` dominant edges without additional calculation and the RDO process is also performed by the mode which is related to dominant edge direction. Experimental results show that proposed scheme can significantly improve the speed of the intra prediction with a negligible loss in the peak signal to noise ratio (PSNR) and a little increase of bits.
Consumer`s Demands for the T-Commerce By the Technology Adoption Types
Park, Sun-Young ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 319~327
DOI : 10.5909/JBE.2008.13.3.319
The purpose of study is to investigate the customer oriented transaction environment for the customers` convenience, the plan of public policy in regard to the customer oriented T-Commerce, and the consumption pattern of customers` commercial transaction, necessary for the marketing strategy by analyzing the demand for the T-Commerce with the purchase intention and maximum willingness to pay according to the demographic factors, the pattern of commercial transaction, and the technology innovation types. The results showed that there were statistically significant relations between consumer`s willingness price to pay for the T-commerce and the consumer`s technology adoption types, monthly internet shopping amounts, and weekly TV-home shopping hours. The simulations on a basis of multiple regression analysis for the T-commerce were illustrated by those factors.
Fast Mode Decision using Global Disparity Vector for Multi-view Video Coding
Han, Dong-Hoon ; Cho, Suk-Hee ; Hur, Nam-Ho ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 328~338
DOI : 10.5909/JBE.2008.13.3.328
Multi-view video coding (MVC) based on H.264/AVC encodes multiple views efficiently by using a prediction scheme that exploits inter-view correlation among multiple views. However, with the increase of the number of views and use of inter-view prediction among views, total encoding time will be increased in multiview video coding. In this paper, we propose a fast mode decision using both MB(Macroblock)-based region segmentation information corresponding to each view in multiple views and global disparity vector among views in order to reduce encoding time. The proposed method achieves on average 40% reduction of total encoding time with the objective video quality degradation of about 0.04 dB peak signal-to-noise ratio (PSNR) by using joint multi-view video model (JMVM) 4.0 that is the reference software of the multiview video coding standard.
Face Relighting Based on Virtual Irradiance Sphere and Reflection Coefficients
Han, Hee-Chul ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 339~349
DOI : 10.5909/JBE.2008.13.3.339
We present a novel method to estimate the light source direction and relight a face texture image of a single 3D model under arbitrary unknown illumination conditions. We create a virtual irradiance sphere to detect the light source direction from a given illuminated texture image using both normal vector mapping and weighted bilinear interpolation. We then induce a relighting equation with estimated ambient and diffuse coefficients. We provide the result of a series of experiments on light source estimation, relighting and face recognition to show the efficiency and accuracy of the proposed method in restoring the shading and shadows areas of a face texture image. Our approach for face relighting can be used for not only illuminant invariant face recognition applications but also reducing visual load and Improving visual performance in tasks using 3D displays.
Transmitter Identification Signal Analyzer
Park, Sung-Ik ; Lee, Jae-Young ; Kim, Heung-Mook ; Oh, Wang-Rok ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 350~364
DOI : 10.5909/JBE.2008.13.3.350
Single frequency network (SFN) design based on the Advanced Television Systems Committee (ATSC) specification, a terrestrial digital television (DTV) system, normally causes a interference problem, among signals from multiple transmitters or repeaters. To solve this, the ATSC recommended practice (RP) introduces a transmitter identification (TxID) signal embedded in a signal from each transmitter or repeater. A TxID signal analyzer is then used to detect the TxID signal, and following the analysis results, a SFN design can be adjusted. This paper discusses the generation and usages of Kasami sequence, is used the TxID signal. The configuration of the TxID signal analyzer to efficiently detect TxID signal is proposed and the results of theoretical performance analysis are provided. Moreover, computer simulation and laboratory test results are provided to evaluate the performance of TxID signal analyzer and the theoretical performance analysis.
Equalization On-Channel Repeater for Single Frequency Network of Terrestrial Digital Multimedia Broadcasting
Park, Sung-Ik ; Park, So-Ra ; Eum, Ho-Min ; Lee, Yong-Tae ; Kim, Heung-Mook ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 365~379
DOI : 10.5909/JBE.2008.13.3.365
In this paper we consider technological requirements of the on-channel repeater to broadcast the terrestrial digital multimedia broadcasting (T-DMB) signals using single frequency networks (SFN) and propose the configuration and implementation method of the equalization on-channel repeater (OCR) that meet such requirements. The proposed equalization OCR not only has short time delay, but shows high output power and good quality of output signal by removing a feedback signal due to incomplete antenna isolation and multipath signal existing between the main transmitter and the OCR. In addition, computer simulations and laboratory tests results are provided to figure out performance of the proposed equalization OCR.
A Karaoke system based on the vocal characteristics
Kim, Yu-Seung ; Kim, Rin-Chul ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 380~387
DOI : 10.5909/JBE.2008.13.3.380
This paper presents a karaoke system employing a vocal region detection algorithm based on the vocal characteristics. In the proposed system, an input song is classified into vocal and instrumental regions using the vocal region detection algorithm. Then, a vocal removal method is applied only to the vocal region. To detect vocal region, a classification algorithm is designed based on the vocal characteristics in the TICFT (twice iterated composite Fourier transform) domain. For vocal removal, vocal components are extracted from a band pass filtered vocal region and they are subtracted from the original song, yielding a vocal removed song. The performance of the proposed method is measured on four different songs.
A Method for Improving Anchor Picture Quality of Multiview Video Coding Scheme
Park, Min-Woo ; Park, Jong-Tae ; Park, Gwang-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 388~400
DOI : 10.5909/JBE.2008.13.3.388
This paper introduces a cost-effective method fur improving anchor picture quality of a multiview video coding scheme that is mainly based on chroma compensation. Proposed method is applied to both INTER
and SKIP modes in only anchor P-pictures. By testing using JVT common test conditions, simulation results show that proposed method can obtain the average BD-PSNR gains fur U and V as 0.136 dB and 0.127 dB, respectively, while maintaining almost same performance for Y (luminance). For the range of low bit-rates, it is observed that average BD-PSNR gains of Y, U, and V are 0.141 dB, 0.494 dB and 0.525 dB, respectively. Necessary computational complexity is very marginal because the number of anchor P-pictures is only 4.18% in comparison with whole coded sequences, however it can be found that the proposed method can significantly improve the coding efficiencies of color components.
A Deblocking Filtering Method for Illumination Compensation in Multiview Video Coding
Park, Min-Woo ; Park, Gwang-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 401~410
DOI : 10.5909/JBE.2008.13.3.401
Multiview Video Coding contains a macroblock-based illumination compensation tool which can compensate the variations of illuminations according to view or temporal directions. Thanks to illumination compensation tool, the coding efficiency of Multiview Video Coding has been enhanced. However illumination compensation tool also generates additional subjective drawbacks of the blocking artifacts due to macroblock-based compensations of mean values. A deblocking filtering method for Multiview Video Coding which is the same as in H.264/AVC does not consider illumination difference between the illumination compensated blocks, thus it can not effectively eliminate the blocking artifacts. Therefore, this paper analyzes the phenomena of blocking artifacts caused by illumination compensation and proposes a method which can effectively eliminate the blocking artifacts with the minimum changes of the H.264 deblockding filtering method. In the simulation results, it can be easily found the blocking artifacts are clearly eliminated in the subjective comparisons, and the average bit-rate reduction is up to 1.44%.
Determination Method of Quantization Skipping Condition for H.264/AVC Video Coding
Song, Won-Seon ; Jeong, Chan-Young ; Hong, Min-Cheol ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 411~414
DOI : 10.5909/JBE.2008.13.3.411
In this paper, we present a determination method of quantization skipping condition for H.264/AVC video encoding standard. In order to reduce the complexity of quantization process that is coming from Integer discrete cosine transform, a quantization skipping condition is derived by the analysis of integer transform and quantization processes. The experimental results show that the proposed algorithm has the capability to reduce the computational complexity of CPU operation time about 10-25(%)
MPEG-4 Audio Decoding Technique using Integer Operations for Real-time Playback on Embedded Processor
Cha, Kyung-Ae ;
Journal of Broadcast Engineering, volume 13, issue 3, 2008, Pages 415~418
DOI : 10.5909/JBE.2008.13.3.415
Some embedded microprocessors do not have an FPU(Floating Point Unit) due to a circuit complexity and power consumption. The performance speed of MPEG-4 AAC decoder on this hardware environment would be slower than corresponding speed for playing back of the decoded results. Therefore, irritating and high-pitched noises are interleaved in the original the audio data. So, in order to play MPEG-4 AAC file on such PDA, a new algorithm that transforms floating-point arithmetic to one with integers, is needed. We have developed a transformation algorithm from floating-point operation to integer operation and implemented the PDA`s AAC Player. We also show the efficiency of our proposed method with the experimental results.