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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
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Bubble Popping Augmented Reality System Using a Vibro-Tactile Haptic Mouse
Jung, Da-Un ; Lee, Woo-Keun ; Jang, Seong-Eun ; Kim, Man-Bae ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 715~722
DOI : 10.5909/JBE.2010.15.6.715
As one of applications in augmented realities, this paper presents a bubble popping system utilizing a haptic vibro-tactile mouse. In this system, virtual bubbles randomly float in the 3D space. By using the vibro-tactile mouse grabbed by a user, the bubbles are popped when they are touched by the mouse in the 3D space. Then a bubble popping effect with addition mouse vibration is delivered to the user`s hand through the mouse. The proposed system is developed on ARToolkit environment. Therefore, basic components such as a camera and a marker pattern are required. The systems is composed of a vibro-haptic mouse, a webcam, a marker pattern, a graphic bubble object, and graphic mouse. Mouse vibration as well as bubble fade-out effect is delivered. Therefore, the combination of visual and tactile bubble popping effects outperforms the usage of a single effect in the experience of augmented reality.
3D Stereoscopic Image Generation of a 2D Medical Image
Kim, Man-Bae ; Jang, Seong-Eun ; Lee, Woo-Keun ; Choi, Chang-Yeol ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 723~730
DOI : 10.5909/JBE.2010.15.6.723
Recently, diverse 3D image processing technologies have been applied in industries. Among them, stereoscopic conversion is a technology to generate a stereoscopic image from a conventional 2D image. The technology can be applied to movie and broadcasting contents and the viewer can watch 3D stereoscopic contents. Further the stereoscopic conversion is required to be applied to other fields. Following such trend, the aim of this paper is to apply the stereoscopic conversion to medical fields. The medical images can deliver more detailed 3D information with a stereoscopic image compared with a 2D plane image. This paper presents a novel methodology for converting a 2D medical image into a 3D stereoscopic image. For this, mean shift segmentation, edge detection, intensity analysis, etc are utilized to generate a final depth map. From an image and the depth map, left and right images are constructed. In the experiment, the proposed method is performed on a medical image such as CT (Computed Tomograpy). The stereoscopic image displayed on a 3D monitor shows a satisfactory performance.
The Prediction of Field Strength for DTV Receiver in the VHF and UHF Bands
Suh, Kyoung-Whoan ; Jung, Hyuk ; Lee, Joo-Hwan ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 731~741
DOI : 10.5909/JBE.2010.15.6.731
In this paper, we propose the methodology of prediction of field strength for a digital television (DTV) receiver by virtue of Recommendation ITU-R P.1546. The curves shown in this recommendation represent the point-to area field strength for 1.0 kW effective radiated power in the 30 MHz ~ 3000 MHz. Based upon the procedures described in this Recommendation, computation results are presented here from the derived formulation of field strength for DTV receiver. To show the validity of this method, some results are compared with the analysis by Okumura-Hata model and it was shown that the error of field strength is in the range of 6.9 ~ 11.5 %. The presented method provides not only the predicted values of field strength for DTV receiving area to check the quality of transmitted signal, but also an appropriate site selection for obtaining good propagation environment. In addition, it can be directly used for analyzing the protection ratio or separated distance for frequency sharing in the same band.
Radius Optimization for Efficient List Sphere Decoding
Lee, Jae-Seok ; Lee, Byung-Ju ; Shim, Byong-Hyo ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 742~748
DOI : 10.5909/JBE.2010.15.6.742
Instead of using sphere decoding, list sphere decoding (LSD) has been introduced to increase the reliability of log-likelihood ratio (LLR) in recent soft decoding schemes employing iterative detection and decoding (IDD). Although LSD provides improved performance, it does not obtain complexity gain due to signal-to-noise ratio (SNR) increment as it detects large number of lattice points. Especially, its inefficient scenario arises when it has to search for lattice points which have small affect for obtaining LLR with high reliability. In this paper, we study an efficient algorithm to remove such lattice points, which results in complexity reduction based on radius optimization.
On the Gain of Component-Swapping Technique with DVB-T2 16K LDPC Codes in MIMO-OFDM Systems
Jeon, Sung-Ho ; Yim, Zung-Kon ; Kyung, Il-Soo ; Kim, Man-Sik ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 749~756
DOI : 10.5909/JBE.2010.15.6.749
The signal space diversity is one of the promising transmission techniques in next generation mobile TV service. However, DVB-T2 does not consider the multiple antennas (MIMO) so that the cyclic Q-delay method, a component interleaver in DVB-T2, causes a critical issue in detecting symbols at the receiver side by increasing the inter-symbol dependency. To solve this problem, the component-swapping technique is proposed, which limits the inter-symbol dependency in order to reduce detection complexity. In this paper, the achievable gain of a component-swapping technique combined with 16K LDPC code defined in DVB-T2 is evaluated by computer simulations. From the results, the gain is confirmed in terms of BER and receive complexity compared to legacy component interleaver methods.
3D Video Quality Improvement for 3D TV using Color Compensation
Jung, Kil-Soo ; Kang, Min-Sung ; Kim, Dong-Hyun ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 757~767
DOI : 10.5909/JBE.2010.15.6.757
In this paper, we have studied the color compensation method for 3D that enables 3D color presentation similar to 2D. The color compensation method uses the difference of color presentation in 2D and 3D mode. First, the RGB I/O relationship curve was derived in 2D and 3D mode based on the input RGB color bar images. The relationship was modeled in modified power-law forms. Based on the modeling information, we generated color mapping tables, which can be used for compensating the difference of colors. The proposed color mapping block can be added at the output block of a 3DTV system, where the 2D content can be bypassed but the 3D content RGB data can be processed using the color mapping table. The experimental results show that the proposed method improves color presentation of a 3DTV system using a proper color compensation based on 2D presentation.
New Illumination compensation algorithm improving a multi-view video coding performance by advancing its temporal and inter-view correlation
Lee, Dong-Seok ; Yoo, Ji-Sang ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 768~782
DOI : 10.5909/JBE.2010.15.6.768
Because of the different shooting position between multi-view cameras and the imperfect camera calibration, Illumination mismatches of multi-view video can happen. This variation can bring about the performance decrease of multi-view video coding(MVC) algorithm. A histogram matching algorithm can be applied to recompensate these inconsistencies in a prefiltering step. Once all camera frames of a multi-view sequence are adjusted to a predefined reference through the histogram matching, the coding efficiency of MVC is improved. However the histogram distribution can be different not only between neighboring views but also between sequential views on account of movements of camera angle and some objects, especially human. Therefore the histogram matching algorithm which references all frames in chose view is not appropriate for compensating the illumination differences of these sequence. Thus we propose new algorithms both the image classification algorithm which is applied two criteria to improve the correlation between inter-view frames and the histogram matching which references and matches with a group of pictures(GOP) as a unit to advance the correlation between successive frames. Experimental results show that the compression ratio for the proposed algorithm is improved comparing with the conventional algorithms.
Subcarrier Allocation for Multiuser in Two-Way OFDMA Relay Networks using Decode-and-Forward Relaying
Shin, Han-Mok ; Lee, Jae-Hong ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 783~790
DOI : 10.5909/JBE.2010.15.6.783
A two-way relay network provide improved spectral efficiency compared with a conventional one-way relay network by using either superposition coding or network coding. OFDMA network provides imptoved performance by adaptive resource allocation. In this paper, we propose a adaptive subcarrier allocation for a multiuser two-way OFDMA relay network. In the proposed algorithm, subcarriers are allocated to the user-pairs and relays to maximize the achievable sum-rate over all user-pairs while satisfying the minimum rate requirement for each user-pair. Simulation results show that the proposed algorithm provides improved performance compared with the static and greedy algorithms.
A Content-Based Motion Adaptive DeInterlacing Technique
Kim, Min-Hwan ; Lee, Chang-Woo ; Lee, Seong-Won ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 791~802
DOI : 10.5909/JBE.2010.15.6.791
Recent prevalence of progressive scan display such as LCD TV demands the quality improvement of existing deinterlacing techniques that convert interlaced scan images including HDTV broadcasting to progressive scan images. In this paper, we proposea motion adaptive deinterlacing technique which can be used for spatial methods, temporal methods, and the spatial-temporal methods can be used for the deinterlacing techniques selectively based on the threshold values calculated by the statistics of motion in the video contents. We also propose an improved spatial deinterlacing technique that adaptively use M-ELA and DOI based on the slant of edges that are obtained by Sobel operation. The improved picture quality of the proposed algorithm is confirmed by objective and subjective quality tests on many test image sequences.
A Frame Structure of Modified ATSC Transmission Systems for Terrestial 3D HDTV Broadcasting
Oh, Jong-Gyu ; Kim, Joon-Tae ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 803~814
DOI : 10.5909/JBE.2010.15.6.803
In this paper, we propose a frame structure for modified ATSC transmission systems which is used for a terrestrial 3D HDTV broadcasting. The modified ATSC transmission systems  see the potential of increasing a transmission capacity at reasonable TOV (Threshold of Visibility) by modifying channel codes of conventional ATSC systems and varying modulations. We use PN symbols (Pseudorandom Noise) in a guard interval which is used for avoiding the ISI (Inter Symbol Interference) to estimate and compensate the time-varying multi path channel effectively with a maximum transmission payload. With PN symbols in the guard interval, a CIR (Channel Impulse Response) in a time domain can be estimated and a compensation in a frequency domain can be achieved for the accurate channel estimation and compensation. The prosed frame structure is applied to the modified ATSC systems and computer simulations are performed for SER (Symbol Error Rate) performances in TU (Typical Urban)-6 Channel.
Uni-directional 4X4 Intra Prediction Mode for H.264/AVC Coding Efficiency
Jung, Kwang-Su ; Park, Sea-Nae ; Sim, Dong-Gyu ; Lee, Yoon-Jin ; Park, Gwang-Hoon ; Oh, Seoung-Jun ; Jeong, Sey-Yoon ; Choi, Jin-Soo ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 815~829
DOI : 10.5909/JBE.2010.15.6.815
In this paper, we propose a new
intra coding method by unidirectional prediction for improvement of intra-frame coding efficiency of H.264/AVC. There are
intra prediction modes in the current H.264/AVC. For the
intra prediction, coding efficiency is achieved by accurate prediction with small block size in relatively complicated regions, and the
intra prediction method can predict more accurately compared to
intra prediction with only one directional information in relatively homogeneous regions. We propose a unidirectional
intra prediction method adopting a small-size prediction and one directional prediction approaches. In order to improve coding efficiency, the proposed method is conducted by
block and their prediction directions are all the same, resulting that we need to send only one directional information for each macroblock. For intra-frame coding setting, we achieve 10.47% and 1.57% coding efficiency in BD-bitrate for only
intra mode and
intra mode, respectively.
An EDOCR with a Feedback Interference Canceller for the ATSC Terrestrial DTV System
Park, Sung-Ik ; Lee, Young-Jun ; Suh, Ki-Hwan ; Eum, Ho-Min ; Seo, Jae-Hyun ; Kim, Heung-Mook ; Kim, Hyoung-Nam ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 830~844
DOI : 10.5909/JBE.2010.15.6.830
In this paper, we propose an equalization digital on-channel repeater (EDOCR) with a feedback interference canceller (FIC) for single frequency network of the ATSC terrestrial DTV system. The proposed EDOCR with FIC does not have only high output power by cancelling feedback signals caused by insufficient antenna isolation through the FIC, but also shows better quality of output signals than the conventional on-channel repeaters (OCRs) by removing multipath signals existing between the main transmitter and the OCR, and residual feedback signals through an equalizer. In addition, computer simulations are provided to figure out the superior performance of the proposed EDOCR with FIC.
A Study on Efficient Cut-off Point between Hot and Cold Items for Data Broadcast Scheduling
Kang, Sang-Hyuk ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 845~852
DOI : 10.5909/JBE.2010.15.6.845
Collecting statistics from client requests, the broadcast server partitions data items into hot and cold-item sets with the optimal cut-off point. Hot items are broadcast periodically with periods based on their access probabilities. In a time slot with no hot items scheduled, the server broadcasts a proper cold item considering the waiting time and the number of outstanding requests. We analyze the optimal the cut-off point by calculating average response time as a function of the cut-off point. Simulation results show that our proposed algorithm outperforms existing methods in various circumstances.
A New Method for Thumbnail Extraction in H.264/AVC Bitstreams
Hong, Seung-Hwan ; Kim, Ji-Eon ; Chin, Young-Min ; Kwon, Jae-Cheol ; Oh, Seoung-Jun ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 853~867
DOI : 10.5909/JBE.2010.15.6.853
Recently, thumbnail techniques are required to index a high-performance video at digital convergence-based multimedia service like IPTV and DMB. Therefore a thumbnail extraction method in H.264/AVC bitstreams has been proposed. However, thumbnail quality deterioration problem at converting the general equation of spatial domain to frequency domain which is generated by not considering about H.264/AVC transform and quantization processing and rounding-off operation in intra prediction. In this paper, we propose a new thumbnail extraction method in H.264/AVC bitstreams. The proposed scheme is based on H.264/AVC core-transform for a thumbnail extraction in frequency domain, and probability theory, intra rounding-off error compensation. Through the implementation and performance evaluation, the subjective quality difference between the output of our scheme and the output of reference decoder is negligible and better than the conventional method, and moreover PSNR gain by up to 8.66 dB.
Transmission Signal Normalization Scheme for Advanced Terrestrial Digital Multimedia Broadcasting
Lee, Sang-Woon ; Kim, Young-Su ; Yun, Jeong-Song ;
Journal of Broadcast Engineering, volume 15, issue 6, 2010, Pages 868~875
DOI : 10.5909/JBE.2010.15.6.868
AT-DMB was developed to raise the transmission rate of existing T-DMB with backward compatability. The transmission and hierarchical video service technique were legislated as Korean TTA standards, and other application service techniques including data services are being developed for the commercial service. In this paper, we consider the power of transmission power level of signals in Advanced Terrestrial Digital Multimedia System according to the constellation ratio. And we propose a new scheme for normalization of transmission signal power level in AT-DMB system. Adopting this scheme, the signal power level of hierarchical modulated signal can be uniform in AT-DMB system both for B Mode and Q Mode.