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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
Selecting the target year
The change analysis of the competitive dynamics among the existing media from the introduction of IPTV service
Choi, Sung-Hee ; Byun, Dong-Shik ; Choi, Seong-Jhin ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 781~795
DOI : 10.5909/JBE.2008.13.6.781
This paper focuses on effects that IPTV will have on domestic broadcasting market in the point of view of customers. The purpose of the paper is to present the future landscape of competitive media market when IPTV is launched, and to research how IPTV will have impact on terrestrial broadcasting, cable TV and satellite broadcasting industry. The paper integrates two known theories, such as the niche-gratification model and the value-expectancy model, to analyze competitive media market. The value expected model makes it possible to overcome the weakness of the niche-gratification model and to forecast competitiveness more accurately. According to this research, competitive power will be in the order of Cable TV, IPTV, and satellite broadcasting. Terrestrial broadcasting does not show strong competitive relationships with others statistically. As a result, Cable TV will be the most competitive medium in the future. IPTV will be stuck in the middle and can rapidly substitute for existing broadcasting services. While IPTV will severely threaten the satellite broadcasting company which has a relatively small number of subscribers, cable TV will be in a superior position to IPTV.
Disparity-based Depth Scaling of Multiview Images
Jo, Cheol-Yong ; Kim, Man-Bae ; Um, Gi-Mun ; Hur, Nam-Ho ; Kim, Jin-Woong ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 796~803
DOI : 10.5909/JBE.2008.13.6.796
In this paper, we present a depth scaling method for multiview images that could provide an 3D depth that a user prefers. Unlike previous works that change a camera configuration, the proposed method utilizes depth data in order to carry out the scaling of a depth range requested by users. From multivew images and their corresponding depth data, depth data is transformed into a disparity and the disparity is adjusted in order to control the perceived depth. In particular, our method can deal with multiview images captured by multiple cameras, and can be expanded from stereoscopic to multiview images. Based upon a DSCQS subjective evaluation test, our experimental results tested on an automultiscopic 3D display show that the perceived depth is appropriately scaled according to user's preferred depth.
Adaptive Rate Control in Frame-level for Real-time H.264/AVC
Kim, Myoung-Jin ; Kim, Kyoung-Hwan ; Hong, Min-Cheol ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 804~816
DOI : 10.5909/JBE.2008.13.6.804
In this paper, we propose an adaptive rate control in frame-level for real-time H.264/AVC. For given QP, bits according to video characteristics, and current frame is close correlation between the adjacent frames. Using the statistical characteristic, we obtain change of occurrence bit about QP to apply the bit amount by QP from the video characteristic and applied in the estimated bit amount of the current frame. In addition, we use weight with QP and occurrence bit amount that is statistical information of encoded previous frames. Simulation results show that the proposed rate control scheme achieves time saving of more than 99% over JM 12.1 rate control algorithm. Nevertheless, PSNR and bit rate were almost same as the performances of JM.
TPEG-based User Created Message Service Model Design for Terrestrial DMB
Lee, Sang-Hee ; Jo, Kang-Hyun ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 817~827
DOI : 10.5909/JBE.2008.13.6.817
The terrestrial-digital multimedia broadcasting(T-DMB) is now provided for the public service and the number of receivers reaches 15 million at the present of August 2008. The service of T-DMB itself has been succeeded in the presence. It is however remained as a supplementary role of stationed TV. It is necessary to find an additional business model as a new media to acquire surplus escaping from the deficit of the present T-DMB service. In the present paper, data service of T-DMB is proposed as candidate of such solution. Especially, TTI(Traffic and Travel Information) service is proposed as a killer application using TPEG(Transport Protocol Experts Group). At present, TPEG has not been so popular in the sense of various user satisfaction. Thus the variety of service including bi-directional service using DMB2.0 as in the sphere of Web2.0 is necessary for the service providers. In the paper, the restriction of TPEG-POI(Point of Interest) application service using the conventional mobile communication infrastructure is indicated. To overcome such restriction, TPEG-UCM(User Created Message) application service model using individual bi-directional media which is initiated and interacting by the users is proposed. In the experiment, the application program shows the usability of the proposed method so that the implementation results show its operability.
Selecting Representative Views of 3D Objects By Affinity Propagation for Retrieval and Classification
Lee, Soo-Chahn ; Park, Sang-Hyun ; Yun, Il-Dong ; Lee, Sang-Uk ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 828~837
DOI : 10.5909/JBE.2008.13.6.828
We propose a method to select representative views of single objects and classes of objects for 3D object retrieval and classification. Our method is based on projected 2D shapes, or views, of the 3D objects, where the representative views are selected by applying affinity propagation to cluster uniformly sampled views. Affinity propagation assigns prototypes to each cluster during the clustering process, thereby providing a natural criterion to select views. We recursively apply affinity propagation to the selected views of objects classified as single classes to obtain representative views of classes of objects. By enabling classification as well as retrieval, effective management of large scale databases for retrieval can be enhanced, since we can avoid exhaustive search over all objects by first classifying the object. We demonstrate the effectiveness of the proposed method for both retrieval and classification by experimental results based on the Princeton benchmark database .
A study on the Influence of lighting on DLP videos of HDTV news programs
Kim, Yong-Kyu ; Lee, Ki-Tae ; Choi, Seong-Jhin ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 838~848
DOI : 10.5909/JBE.2008.13.6.838
Recently, new multimedia techniques using lighting and projection are often used for the production of broadcasting programs. Also news programs use DLP(Digital Lighting Processing) videos with good resolution escaping from the existing set changes. This paper examined the correlations between lighting sources and the resolution of DLP videos, and had a simulation, and then it proposed DLP used ideal lighting for news programs. This paper comparatively examined the resolution of DLP videos influenced by the conditions of lighting, using the videos picked up on the HD camera and the measuring monitor.
No-reference Perceptual Quality Assessment of Digital Image
Lim, Jin-Young ; Chang, Ho-Seok ; Kang, Dong-Wook ; Kim, Ki-Doo ; Jung, Kyeong-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 849~858
DOI : 10.5909/JBE.2008.13.6.849
In this paper, a no-reference perceptual metric is proposed for image quality assessment. It measures the amount of overall blockiness and blurring of the image and evaluates the amount of ringing, staircase, and mosaic noises around the strong edges. Finally, the individual scores are combined by a fuzzy integral to generate the final quality score of the image. The quality scores obtained by the proposed algorithm show strong relationship with the MOS(Mean Opinion Score) values by experts.
Fast View Synthesis Using GPGPU
Shin, Hong-Chang ; Park, Han-Hoon ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 859~874
DOI : 10.5909/JBE.2008.13.6.859
In this paper, we develop a fast view synthesis method that generates multiple intermediate views in real-time for the 3D display system when the camera geometry and depth map of reference views are given in advance. The proposed method achieves faster view synthesis than previous approaches in GPU by processing in parallel the entire computations required for the view synthesis. Specifically, we use
(by NVIDIA) to control GPU device. For increasing the processing speed, we adapted all the processes for the view synthesis to single instruction multiple data (SIMD) structure that is a main feature of CUDA, maximized the use of the high-speed memories on GPU device, and optimized the implementation. As a result, we could synthesize 9 intermediate view images with the size of 720 by 480 pixels within 0.128 second.
Ear Detection using Haar-like Feature and Template
Hahn, Sang-Il ; Cha, Hyung-Tai ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 875~882
DOI : 10.5909/JBE.2008.13.6.875
Ear detection in an image processing is the one of the important area in biometrics. In this paper we propose a human ear detection algorithm with side face images. First, we search a face candidate area in an input image by using skin-color model and try to find an ear area based on Haar-like feature. Then, to verity whether it is the ear area or not, we use the template which is excellent object classification compare to recognize the characters in the plate. In this experiment, the proposed method showed that the processing speed is improved by 60% than previous works and the detection success rate is 92%.
Dynamic Resource Allocation Scheme for Multiple Antenna OFDM-based Wireless Multicast Systems
Xu, Jian ; Lee, Sang-Jin ; Kang, Woo-Seok ; Seo, Jong-Soo ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 883~891
DOI : 10.5909/JBE.2008.13.6.883
Multiple antenna orthogonal frequency division multiplexing (OFDM) is a promising technique for the high downlink-capacity in the next generation wireless systems, in which adaptive resource allocation is an important research issue that can significantly improve the performance with guaranteed QoS for users. However, most of the current resource allocation algorithms are limited to unicast system. In this paper, dynamic resource allocation is studied for multiple antenna OFDM based systems with multicast service. In the simulation, the performance of multicast system was compared with that of the unicast system. Numerical results also show that by using the proposed algorithms the system capacity is significantly improved compared with the conventional
Transform domain Wyner-Ziv video coding with successively improving side information based on decoding reliability
Ko, Bong-Hyuck ; Shim, Hiuk-Jae ; Jeon, Byeung-Woo ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 892~904
DOI : 10.5909/JBE.2008.13.6.892
As a video encoding in resource constrained environments such as sensor networks has become an important issue, DVC(Distributed Video Coding) has been intensively investigated as a solution for light weighted video encoding problem. Known as one of the representative schemes of DVC, the Wyner-Ziv coding generates side information of current frame only at decoder, using correlation among frames, and reconstructs video through noise elimination on the side information using channel code. Accordingly, the better quality of side information brings less channel noise, thus attains better coding performance of the Wyner-Ziv coder. However, since it is hard for decoder to generate an accurate side information without any information of original frame, a method to successively improve side information using successively decoded original frame, based on decoding reliability, was previously developed. However, to improve side information from decoding results, not only an error rate of the decoding result as a reliability, but also the amount of reliable information from the decoding result is important. Therefore, we propose TDWZ(Transform-domain Wyner-Ziv coding) with successively improving side information based on decoding reliability considering not only an error rate but also the amount of reliable information of the decoding results. Our experiment shows the proposed method gains average PSNR up to 1.7 dB over the previous TDWZ, that is without successive side information improvement.
Studies on Applying Scalable Video Coding Signals to Ka band Satellite HDTV Service
Yoon, Ki-Chang ; Chang, Dae-Ig ; Sohn, Won ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 905~914
DOI : 10.5909/JBE.2008.13.6.905
The paper studied the scheme of applying the MPEG-4 SVC signal to the Ka band satellite broadcasting system through the JSCC system to resolve the rain fading problem generated when providing the Ka band HDTV satellite broadcasting service. The Ka band satellite broadcasting system is based on the VCM mode of the DVB-S2, and the SVC signal is considered as one of the spatial scalability, the SNR scalability and the temporal scalability. The JSCC system jointed all the layers of the source coding system and the channel coding system, and allocated bit rate to source coding and channel coding for each layer to get the optimum receiving quality. The layers are consists of a base layer and an enhancement layer, and the bit rate of each layer is affected by the SVC signal. The applicability of the three SVC signals to the Ka band satellite broadcasting service is analyzed with respect to the rain fading, and the scheme of applying the most excellent SVC to the service is considered.
Disparity Estimation for Intermediate View Reconstruction of Multi-view Video
Choi, Mi-Nam ; Yun, Jung-Hwan ; Yoo, Ji-Sang ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 915~929
DOI : 10.5909/JBE.2008.13.6.915
In this paper, we propose an algorithm for pixel-based disparity estimation with reliability in the multi-view image. The proposed method estimates an initial disparity map using edge information of an image, and the initial disparity map is used for reducing the search range to estimate the disparity efficiently. Furthermore, disparity-mismatch on object boundaries and textureless-regions get reduced by adaptive block size. We generated intermediate-view images to evaluate the estimated disparity. Test results show that the proposed algorithm obtained
enhanced PSNR(peak signal to noise ratio) compared to conventional block-based and pixel-based disparity estimation methods.
A Synchronized Multiplexing Scheme for Multi-view HD Video Transport System over IP Networks
Kim, Jong-Ryool ; Kim, Jong-Won ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 930~940
DOI : 10.5909/JBE.2008.13.6.930
This paper proposes a prototype realization of multi-view HD video transport system with synchronized multiplexing over IP networks. The proposed synchronized multiplexing considers the synchronization during video acquisition and the multiplexing for the interactive view-selection during transport. For the synchronized acquisition from multiple HDV camcorders through IEEE 1394 interface, we estimate the timeline differences among MPEG-2 compressed video streams by using global time of network between the cameras and a server and correct timelines of video streams by changing the time stamp of the MPEG-2 system stream. Also, we multiplex a selected number of acquired HD views at the MPEG-2 TS (transport stream) level for the interactive view-selection during transport. Thus, with the proposed synchronized multiplexing scheme, we can display synchronized HD view.
Eliminating Color Mixing of Projector-Camera System for Fast Radiometric Compensation
Lee, Moon-Hyun ; Park, Han-Hoon ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 941~950
DOI : 10.5909/JBE.2008.13.6.941
The quality of projector output image is influenced by the surrounding conditions such as the shape and color of screen, and environmental light. Therefore, techniques that ensure desirable image quality, regardless of such surrounding conditions, have been in demand and are being steadily developed. Among the techniques, radiometric compensation is a representative one. In general, radiometric compensation is achieved by measuring the color of the screen and environmental light based on an analysis of camera image of projector output image and then adjusting the color of projector input image in a pixel-wise manner. This process is not time-consuming for small sizes of images but the speed of the process drops linearly with respect to image size. In large sizes of images, therefore, reducing the time required for performing the process becomes a critical problem. Therefore, this paper proposes a fast radiometric compensation method. The method uses color filters for eliminating the color mixing between projector and camera because the speed of radiometric compensation depends mainly on measuring color mixing between projector and camera. By using color filters, there is no need to measure the color mixing. Through experiments, the proposed method improved the compensation speed by 44 percent while maintaining the projector output image quality. This method is expected to be a key technique for widespread use of projectors for large-scale and high-quality display.
ROI-based Video Transmission using Cooperative Diversity over Wireless Ad-hoc Networks
Jang, Uk ; Lee, Sang-Hoon ; Bae, Kyung-Hoon ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 951~961
DOI : 10.5909/JBE.2008.13.6.951
Cooperative diversity is a cooperative technique which exploits user diversity by decoding the combined signal of the relayed signal and the direct signal in wireless multi-hop networks. Using the cooperation, the performance of the network system can be improved because cooperative diversity which is very strong against the fading channels can be achieved. In this paper, we propose the technique that provides the enhanced visual quality of the reconstructed video using the cooperative diversity with the FMO which is the error resilience tool of H.264/AVC standardization over wireless networks. The eye-tracker can detect the gaze point of user and transmit the gaze information to the nodes. After receiving the gaze information of user, each node performs ROI encoding according to the received gaze information. After encoding, video sources are divided into ROI and Non-ROI. Through the simulation results, the better visual quality of the reconstructed video is achieved when ROI and Non-ROI are transmitted through different channels.
Multi-Shape Retrieval Using Multi Curvature-Scale Space Descriptor
Park, Sang Hyun ; Lee, Soo-Chahn ; Yun, Il-Dong ;
Journal of Broadcast Engineering, volume 13, issue 6, 2008, Pages 962~965
DOI : 10.5909/JBE.2008.13.6.962
2-D shape descriptors, which are vectors representing characteristics of shapes, enable comparison and classification of shapes and are mainly applied to image and 3-D model retrieval. Existing descriptors have limitations that they only describe shapes of single closed contours or lack in precision, making it difficult to be applied to shapes with multiple contours. Therefore, in this paper, we propose a new shape descriptor called Multi-Curvature-Scale Space that can be applied to shapes with multiple contours. Specifically, we represent the topology of the sub-contours in the multi-contour along with Curvature-Scale Space descriptors to represent the shapes of each sub-contours. Also, by allowing the weight of each component to be controlled when computing the distance between descriptors the weight, we deal with ambiguities in measuring similarity between shapes. Results of various experiments that prove the effectiveness of proposed descriptor are presented.