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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 14, Issue 6 - Nov 2009
Volume 14, Issue 5 - Sep 2009
Volume 14, Issue 4 - Jul 2009
Volume 14, Issue 3 - May 2009
Volume 14, Issue 2 - Mar 2009
Volume 14, Issue 1 - Jan 2009
Selecting the target year
Intra Prediction Information Skip using Analysis of Adjacent Pixels for H.264/AVC
Kim, Dae-Yeon ; Kim, Dong-Kyun ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 271~279
DOI : 10.5909/JBE.2009.14.3.271
The Moving Picture Experts Group (MPEG) and Video Coding Experts Group (VCEG) have developed a new standard that promises to outperform the earlier MPEG-4 and H.263 standards. The new standard is called H.264/AVC (Advanced Video Coding) and is published jointly as MPEG-4 Part 10 and ITU-T Recommendation H.264. In particular, the H.264/AVC intra prediction coding provides nine directional prediction modes for every
block in order to reduce spatial redundancies. In this paper, an ABS (Adaptive Bit Skip) mode is proposed. In order to achieve coding efficiency, the proposed method can remove the mode bits to represent the prediction mode by using the similarity of adjacent pixels. Experimental results show that the proposed method achieves the PSNR gain of about 0.2 dB in R-D curve and reduces the bit rates about 3.6% compared with H.264/AVC.
Attribute-based authentication scheme in IPTV broadcasting system
Lee, Ji-Seon ; Kim, Hyo-Dong ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 280~287
DOI : 10.5909/JBE.2009.14.3.280
An IPTV (Internet Protocol Television) technology is the new convergence technology of the telecommunication and broadcasting which provides various bidirectional TV services. To provide these services only to legal subscribers, mutual authentication between set-top box connected with TV set and the smart card owned by a subscriber is needed. In this paper, we propose an attribute-based mutual authentication scheme that only someone who is satisfied with some attributes, such as titles or departments, can access the contents provided by the IPTV service in an organization. We also show that the proposed scheme is secure. Our proposed scheme has a virtue that user can access various services, provided by an organization where he/she belongs to, according to their attributes with only one time registration. As far as we know, this is the first attribute-based authentication scheme which can be applied to any organizations in IPTV environments.
A Study on Cross-Association between UCI Identification System and Content-based Identifier for Copyright Identification and Management of Broadcasting Content
Kim, Joo-Sub ; Nam, Je-Ho ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 288~298
DOI : 10.5909/JBE.2009.14.3.288
In this paper, we propose a scheme to associate content-based video signature with Universal Content Identifier (UCI) system of broadcast content for copyright identification and management. Note that content-based video signature can identify a previously distributed content since it is directly extracted from content itself without allocation process of identifier such as UCI. Thus, we design the schema of UCI application metadata, which provides a video signature in order to consistently maintain a systemic link between UCI and the video signature. Also, we present the scenarios of copyright identification, management and additional service, which are based on transmission and management mechanism of video signature with UCI identification system.
Zoom Lens Distortion Correction Of Video Sequence Using Nonlinear Zoom Lens Distortion Model
Kim, Dae-Hyun ; Shin, Hyoung-Chul ; Oh, Ju-Hyun ; Nam, Seung-Jin ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 299~310
DOI : 10.5909/JBE.2009.14.3.299
In this paper, we proposed a new method to correct the zoom lens distortion for the video sequence captured by the zoom lens. First, we defined the nonlinear zoom lens distortion model which is represented by the focal length and the lens distortion using the characteristic that lens distortion parameters are nonlinearly and monotonically changed while the focal length is increased. Then, we chose some sample images from the video sequence and estimated a focal length and a lens distortion parameter for each sample image. Using these estimated parameters, we were able to optimize the zoom lens distortion model. Once the zoom lens distortion model was obtained, lens distortion parameters of other images were able to be computed as their focal lengths were input. The proposed method has been made experiments with many real images and videos. As a result, accurate distortion parameters were estimated from the zoom lens distortion model and distorted images were well corrected without any visual artifacts.
Reception Power Estimation using TxID Signal
Park, Sung-Ik ; Kim, Heung-Mook ; Oh, Wang-Rok ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 311~321
DOI : 10.5909/JBE.2009.14.3.311
In a single frequency network (SFN) for Advanced Television Systems Committee (ATSC) terrestrial digital television (DTV) system, the interference due to the use of same frequency among multiple transmitters or repeaters is inevitable for receivers. This problem can be solved by adjusting transmit power and time of each transmitter and repeater. To adjust SFNs, the ATSC recommended practice (RP) introduces a transmitter identification (TxID) signal which is embedded in a signal from each transmitter or repeater. This paper proposes an efficient method to estimate the individual reception power from each transmitter or repeater based on the channel profile of SFN and the total reception power. Moreover, field test results are provided to evaluate the performance of the proposed method.
Efficient Data Representation of Stereo Images Using Edge-based Mesh Optimization
Park, Il-Kwon ; Byun, Hye-Ran ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 322~331
DOI : 10.5909/JBE.2009.14.3.322
This paper proposes an efficient data representation of stereo images using edge-based mesh optimization. Mash-based two dimensional warping for stereo images mainly depends on the performance of a node selection and a disparity estimation of selected nodes. Therefore, the proposed method first of all constructs the feature map which consists of both strong edges and boundary lines of objects for node selection and then generates a grid-based mesh structure using initial nodes. The displacement of each nodal position is iteratively estimated by minimizing the predicted errors between target image and predicted image after two dimensional warping for local area. Generally, iterative two dimensional warping for optimized nodal position required a high time complexity. To overcome this problem, we assume that input stereo images are only horizontal disparity and that optimal nodal position is located on the edge include object boundary lines. Therefore, proposed iterative warping method performs searching process to find optimal nodal position only on edge lines along the horizontal lines. In the experiments, we compare our proposed method with the other mesh-based methods with respect to the quality by using Peak Signal to Noise Ratio (PSNR) according to the number of nodes. Furthermore, computational complexity for an optimal mesh generation is also estimated. Therefore, we have the results that our proposed method provides an efficient stereo image representation not only fast optimal mesh generation but also decreasing of quality deterioration in spite of a small number of nodes through our experiments.
Additional data packetizing method for providing multichannel audio service on T-DMB environment
Lee, Yong-Ju ; Seo, Jeong-Il ; Beack, Seung-Kwon ; Kang, Kyeong-Ok ; Lim, Jong-Soo ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 332~341
DOI : 10.5909/JBE.2009.14.3.332
Terrestrial digital multimedia broadcasting(T-DMB) is one of mobile broadcasting services, and the commercial service was started in December 2005 in Korea. The performance targets of T-DMB are providing VCD(video CD) quality video and FM radio quality audio. In recent years, the researches for providing high quality video or audio service on T-DMB environments have been being carried out. To provide high-quality video or audio service, some additional data should be transmitted to the receiver as well as T-DMB video and audio data. Since the data rate for one T-DMB program is low, it is important to transmit the additional data at a low bit rate. In this paper, we propose a packetizing method for efficient transmission of the additional data to provide multichannel audio service on T-DMB environment.
Vote Decision-based Deinterlacing Scheme For Directional Error Correction
Oh, Sye-Hoon ; Lee, Yeo-Song ; Ahn, Chang-Beom ; Oh, Seoung-Jun ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 342~356
DOI : 10.5909/JBE.2009.14.3.342
This paper presents a vote decision-based deinterlacing scheme for false directional error correction(VDD) to convert interlaced signal into non-interlaced signal using only one fields. The VDD using the vote decision goes through four steps process. The first step extracts regions having doubt of false edge using MM-ELA method. In these regions, the edge direction is decided by the majority vote using upper adjacent pixels's information through the second step. But, we still have undecided directions, which will be decided by the majority vote and the directional average decision at the third step. This step preserves the edge directions and minimizes visual degradation. Finally, the last step interpolates undecided pixels using DOI method which can consider the fine edge direction. Although the VDD with hierarchical structure has a high complexity, it can extract delicate edge compared to other pixel-by-pixel or window-by-window deinterlacing algorithms. Simulation results show that it has significantly improved both the subjective and objective qualities of the reconstructed images.
Study of efficient sampling frequency offset estimation schemes for OFDM system
Wang, Do-Huy ; Yoon, Eun-Chul ; Kim, Joon-Tae ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 357~365
DOI : 10.5909/JBE.2009.14.3.357
In an OFDM system, the sampling frequency offset between the transmitter and receiver is known to cause the inter-channel interference (ICI), resulting in performance degradation. Sampling frequency offset can be generally estimated by correlation of the pilot signal within contiguous OFDM symbol. In this paper, we propose sampling frequency offset estimation schemes using various mixture of consecutive symbols. We conduct a simulation in DVB-T(2K mode) system, which shows that the proposed schemes can improve the performance of sampling frequency offset estimation by decreasing noise effect within consecutive symbols in AWGN channel model.
Real-time moving object tracking and distance measurement system using stereo camera
Lee, Dong-Seok ; Lee, Dong-Wook ; Kim, Su-Dong ; Kim, Tae-June ; Yoo, Ji-Sang ;
Journal of Broadcast Engineering, volume 14, issue 3, 2009, Pages 366~377
DOI : 10.5909/JBE.2009.14.3.366
In this paper, we implement the real-time system which extracts 3-dimensional coordinates from right and left images captured by a stereo camera and provides users with reality through a virtual space operated by the 3-dimensional coordinates. In general, all pixels in correspondence region are compared for the disparity estimation. However, for a real time process, the central coordinates of the correspondence region are only used in the proposed algorithm. In the implemented system, 3D coordinates are obtained by using the depth information derived from the estimated disparity and we set user's hand as a region of interest(ROI). After user's hand is detected as the ROI, the system keeps tracking a hand's movement and generates a virtual space that is controled by the hand. Experimental results show that the implemented system could estimate the disparity in real -time and gave the mean-error less than 0.68cm within a range of distance, 1.5m. Also It had more than 90% accuracy in the hand recognition.