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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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2D-to-3D Stereoscopic conversion: Depth estimation in monoscopic soccer videos
Ko, Jae-Seung ; Kim, Young-Woo ; Jung, Young-Ju ; Kim, Chang-Ick ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 427~439
DOI : 10.5909/JBE.2008.13.4.427
This paper proposes a novel method to convert monoscopic soccer videos to stereoscopic videos. Through the soccer video analysis process, we detect shot boundaries and classify soccer frames into long shot or non-long shot. In the long shot case, the depth mapis generated relying on the size of the extracted ground region. For the non-long shot case, the shot is further partitioned into three types by considering the number of ground blocks and skin blocks which is obtained by a simple skin-color detection method. Then three different depth assignment methods are applied to each non-long shot types: 1) Depth estimation by object region extraction, 2) Foreground estimation by using the skin block and depth value computation by Gaussian function, and 3)the depth map generation for shots not containing the skin blocks. This depth assignment is followed by stereoscopic image generation. Subjective evaluation comparing generated depth maps and corresponding stereoscopic images indicate that the proposed algorithm can yield the sense of depth from a single view images.
Research for measuring degradation of IPTV-serviced videos
Kim, Won-Jun ; Kim, Chang-Ick ; Kim, Jin-Sul ; Lee, Hyun-Woo ; Ryu, Won ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 440~451
DOI : 10.5909/JBE.2008.13.4.440
With the advent of IP-based multimedia service based on IP network, there is a rapidly increasing demand for IPTV. Unlike the previous coaxial cable based TV, IPTV provides a variety of convergence services based on IP newark. However, since the IPTV service quality is a lot affected by the network degradation such as packet loss and jitter, it may not be guaranteed. In this paper, we propose an objective measure for various degradations of IPTV-based videos considering subjective assessment. To this end, we first determine QoE(Quality of Experience) indicators, which can affect human visual perception. Then we develop the video quality metric for each QoE indicator. Subjective assessment based on MOS is conducted and used to construct mapping relationship between each measure and perceived visual quality. Experiments are performed on various videos to confirm the efficiency and robustness of the proposed method and show high correlation with subjective assessment.
Optimized DSP Implementation of Audio Decoders for Digital Multimedia Broadcasting
Park, Nam-In ; Cho, Choong-Sang ; Kim, Hong-Kook ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 452~462
DOI : 10.5909/JBE.2008.13.4.452
In this paper, we address issues associated with the real-time implementation of the MPEG-1/2 Layer-II (or MUSICAM) and MPEG-4 ER-BSAC decoders for Digital Multimedia Broadcasting (DMB) on TMS320C64x+ that is a fixed-point DSP processor with a clock speed of 330 MHz. To achieve the real-time requirement, they should be optimized in different steps as follows. First of all, a C-code level optimization is performed by sharing the memory, adjusting data types, and unrolling loops. Next, an algorithm level optimization is carried out such as the reconfiguration of bitstream reading, the modification of synthesis filtering, and the rearrangement of the window coefficients for synthesis filtering. In addition, the C-code of a synthesis filtering module of the MPEG-1/2 Layer-II decoder is rewritten by using the linear assembly programming technique. This is because the synthesis filtering module requires the most processing time among all processing modules of the decoder. In order to show how the real-time implementation works, we obtain the percentage of the processing time for decoding and calculate a RMS value between the decoded audio signals by the reference MPEG decoder and its DSP version implemented in this paper. As a result, it is shown that the percentages of the processing time for the MPEG-1/2 Layer-II and MPEG-4 ER-BSAC decoders occupy less than 3% and 11% of the DSP clock cycles, respectively, and the RMS values of the MPEG-1/2 Layer-II and MPEG-4 ER-BSAC decoders implemented in this paper all satisfy the criterion of -77.01 dB which is defined by the MPEG standards.
Field Test Results Of A DTV Distributed Translator Network
Wang, Soo-Hyun ; Suh, Young-Woo ; Mok, Ha-Kyun ; Lee, Jae-Young ; Lee, Yong-Hoon ; Kim, Heung-Mook ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 463~478
DOI : 10.5909/JBE.2008.13.4.463
A Distributed Translator Network(DTxR) is a cost-effective and frequency-effective method which can use existing transmission utilities and can be constructed in a shorter time as compared with Multiple Frequency Network(MFN) or Single Frequency Network(SFN) using On Channel Repeater(OCR). In order to verify the feasibility of DTxR, this field test was done in 30 points of north-west area in Seoul using 3rd, 5th, and 6th generation DIV receivers. Electric field strength, noise margin and ease of reception were measured and subjective evaluation of video quality was done in these points during the field test. With the test result, an improvement of receiving quality was obtained and an ease of reception was increased in case of the 5th. and 6th. receiver. From the results, we conclude that DTxR is a feasible method in DIV networks.
Allowable Interference Criteria Between Digital FWSs
Lee, Ki-Hwan ; Lee, Joo-Hwan ; Suh, Kyoung-Whoan ; Song, Ju-Bin ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 479~487
DOI : 10.5909/JBE.2008.13.4.479
The method to determine allowable interference criteria is required due to new digital FWSs(Fixed Wireless Systems) adding to allowable frequency bands, besides current FWSs and digital FWSs. In this paper, we suggested a method to define allowable interference between digital FWSs. Types of interference for FWS were defined and channel characteristics were analyzed. Allowable interference criteria were analyzed using the suggested method for M-ary QAM modulations, which is typical modulation technique of digital FWS.
UCC-Resilient HD Content Watermarking Scheme on DCT Compressed Domain
Kim, Jung-Youn ; Nam, Je-Ho ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 489~500
DOI : 10.5909/JBE.2008.13.4.489
We propose a novel high-definition content watermarking algorithm that is highly feasible in UCC (User Created Contents) environment. We begin by addressing an association between broadcasting content and UCC in a view of copyrights, then present watermark requirements by analyzing various UCC editing-effect. Also, we provide a brief review of previous watermarking techniques that are supposed to satisfy the requirements. Our proposed scheme inserts a invisible watermark into both DC and AC components on
block DCT domain and extracts them after synchronization using DC image. Experimental results show that our technique satisfies the requirements of invisibility and robustness to a variety of attacks such as rotation, scaling, cropping, and JPEG compression, etc. Note that the proposed scheme is highly resilient to UCC edit attacks that are combined by many different types of watermark attacks.
A Performance Comparison of Spatial Scalable Encoders with the Constrained Coding Modes for T-DMB/AT-DMB Services
Kim, Jin-Soo ; Park, Jong-Kab ; Kim, Kyu-Seok ; Choi, Sung-Jin ; Seo, Kwang-Deok ; Kim, Jae-Gon ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 501~515
DOI : 10.5909/JBE.2008.13.4.501
Recently, as users` requests for high quality mobile multimedia services are rapidly increasing and additional bandwidth can be provided by adopting the hierarchical modulation transmission technology, the research on the Advanced Terrestrial DMB (AT-DMB) service using the SVC (Scalable Video Coding) scheme is being actively studied. But, in order to realize a compatible video service and to accelerate the successful standardization and commercialization, it is necessary to simplify the compatible encoder structure. In this parer, we propose a fast mode decision method by constraining the redundant coding modes in the spatial scalable encoder that keeps the current T-DMB video in base layer. The proposed method is based on the statistical characteristics of each coding mode at both base and enhancement layers, inter-layer predictions, which are derived by investigating macroblock-layer coding modes of the spatial scalable encoder`s functional structure. Through computer simulations, it is shown that a simplified encoder model that reduces the heavy computational burden can be found, while keeping the objective visual quality very high.
Derivation of Illumination Compensation Information for SKIP Modes in Multi-view Video Coding
Park, Min-Woo ; Park, Gwang-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 516~527
DOI : 10.5909/JBE.2008.13.4.516
This paper introduces a derivation method of both P-SKIP and B-SKIP modes for illumination compensation in the multi-view video coding scheme. In this proposed method, mismatches between IC flag and IC offset in P-SKIP mode are removed, and also computational complexity is far reduced in B-SKIP mode in comparison to a multi-view video coding scheme. In simulation results, proposed method has the almost same coding efficiency in comparison with the referenced coding scheme. However computational complexity in 11m-time decoding process is tremendously reduced, such that the average number of blocks that should be processed in P-SKIP mode is saved in about 7.47%, and the average number of operations per block in B-SKIP mode is saved in about 50.36% and corresponding average decoding time per block is also saved in 46%.
Java Card-based User Authentication and Personalized IPTV Services in 3G Mobile Environment
Park, Youn-Kyoung ; Lim, Sun-Hee ; Yun, Seung-Hwan ; Yi, Ok-Yeon ; Lee, Sang-Jin ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 528~543
DOI : 10.5909/JBE.2008.13.4.528
Internet Protocol Television (IPTV) provides an interactive and personalized service for realizing integrated broadcasting and telecommunication services. Set-top box (SIB) connected to TV is an essential component required for IPTV and has a unique hardware identifier used in identification and authentication. It means that subscriber authentication based on box-level identification is inconsistent with IPTV`s main intention of providing personalized services. The proposed solution is to provide an opportunity to use the flexible user-centric authentication mechanism through Java Card applets in IPTV application server and 3G networks. This paper suggests personalized services by moving the user`s private data and authentication management beyond the STB to a truly personalized device, the ubiquitous mobile phone. In addition, this paper presents effectiveness and security analysis for verifying the proposal.
A new approach for overlay text detection from complex video scene
Kim, Won-Jun ; Kim, Chang-Ick ;
Journal of Broadcast Engineering, volume 13, issue 4, 2008, Pages 544~553
DOI : 10.5909/JBE.2008.13.4.544
With the development of video editing technology, there are growing uses of overlay text inserted into video contents to provide viewers with better visual understanding. Since the content of the scene or the editor`s intention can be well represented by using inserted text, it is useful for video information retrieval and indexing. Most of the previous approaches are based on low-level features, such as edge, color, and texture information. However, existing methods experience difficulties in handling texts with various contrasts or inserted in a complex background. In this paper, we propose a novel framework to localize the overlay text in a video scene. Based on our observation that there exist transient colors between inserted text and its adjacent background a transition map is generated. Then candidate regions are extracted by using the transition map and overlay text is finally determined based on the density of state in each candidate. The proposed method is robust to color, size, position, style, and contrast of overlay text. It is also language free. Text region update between frames is also exploited to reduce the processing time. Experiments are performed on diverse videos to confirm the efficiency of the proposed method.