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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 19, Issue 6 - Nov 2014
Volume 19, Issue 5 - Sep 2014
Volume 19, Issue 4 - Jul 2014
Volume 19, Issue 3 - May 2014
Volume 19, Issue 2 - Mar 2014
Volume 19, Issue 1 - Jan 2014
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Real-time Depth Image Refinement using Hierarchical Joint Bilateral Filter
Shin, Dong-Won ; Hoa, Yo-Sung ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 140~147
DOI : 10.5909/JBE.2014.19.2.140
In this paper, we propose a method for real-time depth image refinement. In order to improve the quality of the depth map acquired from Kinect camera, we employ constant memory and texture memory which are suitable for a 2D image processing in the graphics processing unit (GPU). In addition, we applied the joint bilateral filter (JBF) in parallel to accelerate the overall execution. To enhance the quality of the depth image, we applied the JBF hierarchically using the compute unified device architecture (CUDA). Finally, we obtain the refined depth image. Experimental results showed that the proposed real-time depth image refinement algorithm improved the subjective quality of the depth image and the computational time was 260 frames per second.
Quality Verification of Fixed and Mobile Hybrid 3DTV Services via a Subjective Test of Mixed-resolution Stereoscopic Videos
Lee, Jooyoung ; Kim, Sung-Hoon ; Jeong, Seyoon ; Choi, Jin Soo ; Kang, Dong-Wook ; Jung, Kyeong-Hoon ; Kim, Jinwoong ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 148~157
DOI : 10.5909/JBE.2014.19.2.148
Various techniques have been developed for efficient compression of stereoscopic 3D videos. Mixed-resolution based approach is one representative bit-rate saving method based on the characteristics of human visual system that the mixed-resolution stereoscopic videos are perceived close to the higher resolution. However, when the difference between the left and right image resolutions is bigger than a certain threshold level, it causes the perceived quality degradation of the 3D images. Subsequently, several researches tried to find the correlation between the difference in resolution and the level of the perceived quality degradation, but they conducted the experiments just considering the difference in resolution without considering the viewing distances, so thereby different results were retrieved from test to test. In this work, we calculated the optimal viewing distance based on the human visual system, and conducted the subjective tests with the calculated viewing distance. With the results, we demonstrate that the fixed and mobile hybrid 3DTV, which is based on mixed-resolution stereoscopic images, can provide the high quality 3D services.
Fast Intra Prediction Mode Decision based on Rough Mode Decision and Most Probable Mode in HEVC
Lee, Seung-Ho ; Park, Sang-Hyo ; Jang, Euee Seon ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 158~165
DOI : 10.5909/JBE.2014.19.2.158
High Efficiency Video Coding (HEVC), the latest video coding standard, has twice of the compression efficiency compared to AVC/H.264 under the same image quality condition. To obtain the improved efficiency, however, it was adopted for many methods which need complicated calculation, and the time complexity of HEVC was increased more than that of AVC/H.264. To solve this problem, the various fast algorithms have been researched. In this paper, we propose a fast intra prediction mode decision method which uses result of Rough Mode Decision (RMD) and Most Probable Mode (MPM). The proposed method selects a best predicted mode by comparing each predicted directions which are calculated through RMD and MPM. We applied the proposed method to HM 10.0 and conducted an comparing experiment in All-Intra environment. The experiment result showed that total encoding time is reduced by about 26% on average with about a 0.8% loss of BD-rate.
A Study for Improved Human Action Recognition using Multi-classifiers
Kim, Semin ; Ro, Yong Man ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 166~173
DOI : 10.5909/JBE.2014.19.2.166
Recently, human action recognition have been developed for various broadcasting and video process. Since a video can consist of various scenes, keypoint approaches have been more attracted than template based methods for real application. Keypoint approahces tried to find regions having motion in video, and made 3-dimensional patches. Then, descriptors using histograms were computed from the patches, and a classifier based on machine learning method was applied to detect actions in video. However, a single classifier was difficult to handle various human actions. In order to improve this problem, approaches using multi classifiers were used to detect and to recognize objects. Thus, we propose a new human action recognition using decision-level fusion with support vector machine and sparse representation. The proposed method extracted descriptors based on keypoint approach from a video, and acquired results from each classifier for human action recognition. Then, we applied weights which were acquired by training stage to fuse each results from two classifiers. The experiment results in this paper show better result than a previous fusion method.
A Resolution-Scalable Data Compression Method of a Digital Hologram
Kim, Yoonjoo ; Seo, Young-Ho ; Kim, Dong-Wook ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 174~183
DOI : 10.5909/JBE.2014.19.2.174
This paper is to propose a scalable video coding scheme for adaptive digital hologram video service for various reconstruction environments. It uses both the light source information and digital hologram at both the sending side and the receiving side. It is a resolution-scalable coding method that scales the resolution, that is, the size of the reconstructed image. The method compresses the residual data for both the digital hologram and the light source information. For the digital hologram, a lossy compression method is used, while for the light source information, a lossless compression method is used. The experimental results showed that the proposed method is superior to the existing method in the image quality at the same compression ratio. Especially it showed better performance than the existing method as the compression ratio becomes higher.
A Synchronous Cooperative Communication for Emergency Alert Broadcast Based on Cellular Systems
Chang, Sekchin ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 184~194
DOI : 10.5909/JBE.2014.19.2.184
The CBS methodology has been utilized in order to make a rapid broadcast of emergency alert based on cellular systems. We present a synchronous cooperative communication method for the CBS. Especially, we suggest a synchronization scheme and a data recovery approach for high-rate cooperative communications. For the high-rate transfer of emergency alert, the cyclic prefix is added to the preamble for the synchronization. For the data recovery, the Alamouti technique is utilized on frequency domain, which is similar to SC-FDE. The simulation results confirm that our proposed scheme is very suitable for the CBS.
Digitally Modulated Signal Classification based on Higher Order Statistics of Cyclostationary Process
Ahn, Woo-Hyun ; Nah, Sun-Phil ; Seo, Bo-Seok ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 195~204
DOI : 10.5909/JBE.2014.19.2.195
In this paper, we propose an automatic modulation classification method for ten digitally modulated baseband signals, such as 2-FSK, 4-FSK, 8-FSK, MSK, BPSK, QPSK, 8-PSK, 16-QAM, 32-QAM, and 64-QAM based on higher order statistics of cyclostationary process. The first order cyclic moments and higher order cyclic cumulants of the signal are used as features of the modulation signals. The proposed method consists of two stages. At the first stage, we classify modulation signals as M-FSK and non-FSK using peaks of the first order cyclic moment. At the next step, we apply the Gaussian mixture model-based classifier to classify non-FSK. Simulation results are demonstrated to evaluate the proposed scheme. The results show high probability of classification even in the presence of frequency and phase offsets.
Automated Image Alignment and Monitoring Method for Efficient Stereoscopic 3D Contents Production
Kim, Jae-In ; Kim, Taejung ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 205~214
DOI : 10.5909/JBE.2014.19.2.205
Minimization of visual fatigue is important for production of high quality stereoscopic 3D contents. Vertical disparity of stereo images occurred during contents production is considered as the main factor of visual fatigue. To ensure correct stereoscopy vertical disparity needs to be eliminated. In this paper, a method for automated image alignment was proposed for Stereoscopic 3D contents generation and post-processing steps. The proposed method consists of two parts: rectification for image alignment and camera motion detection. The proposed method showed that its rectification performance was the most superior among the existing methods tested and that camera motion detection had a success rate of 98.35%. Through these evaluations, we confirmed that the proposed method can be effectively applied to 3D contents production.
Measurement and Modeling of Crosstalk and 3D Visual Fatigue Along with Horizontal Position in Mobile Glassless 3D Display Having Parallax Barrier
Park, JongJin ; Kim, ShinWoo ; Li, Hyung-Chul O. ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 215~226
DOI : 10.5909/JBE.2014.19.2.215
The 3D technology has been spread slowly and the reason would be attributed to the fact that most commercialized 3D displays require 3D glasses. There have been various researches on human factors of glass type 3D display. In this study we measured and modeled crosstalk as well as 3D visual fatigue induced by mobile glassless 3D display. Crosstalk as well as visual fatigue varied depending on horizontal position of the 3D mobile display. Measured crosstalk was relative low around the center of the display and it increased at the side of the display. Similar results were found in the measurement of 3D visual fatigue and discomfort. These results imply that human factors should be considered in the process of design and evaluation of mobile 3D displays.
Enhanced Prediction for Low Complexity Near-lossless Compression
Son, Ji Deok ; Song, Byung Cheol ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 227~239
DOI : 10.5909/JBE.2014.19.2.227
This paper proposes an enhance prediction for conventional near-lossless coder to effectively lower external memory bandwidth in image processing SoC. First, we utilize an already reconstructed green component as a base of predictor of the other color component because high correlation between RGB color components usually exists. Next, we can improve prediction performance by applying variable block size prediction. Lastly, we use minimum internal memory and improve a temporal prediction performance by using a template dictionary that is sampled in previous frame. Experimental results show that the proposed algorithm shows better performance than the previous works. Natural images have approximately 30% improvement in coding efficiency and CG images have 60% improvement on average.
Convergence Complexity Reduction for Block-based Compressive Sensing Reconstruction
Park, Younggyun ; Shim, Hiuk Jae ; Jeon, Byeungwoo ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 240~249
DOI : 10.5909/JBE.2014.19.2.240
According to the compressive sensing theory, it is possible to perfectly reconstruct a signal only with a fewer number of measurements than the Nyquist sampling rate if the signal is a sparse signal which satisfies a few related conditions. From practical viewpoint for image applications, it is important to reduce its computational complexity and memory burden required in reconstruction. In this regard, a Block-based Compressive Sensing (BCS) scheme with Smooth Projected Landweber (BCS-SPL) has been already introduced. However, it still has the computational complexity problem in reconstruction. In this paper, we propose a method which modifies its stopping criterion, tolerance, and convergence control to make it converge faster. Experimental results show that the proposed method requires less iterations but achieves better quality of reconstructed image than the conventional BCS-SPL.
Non-Reference P Frame Coding for Low-Delay Encoding in Internet Video Coding
Kim, Dong-Hyun ; Kim, Jin-Soo ; Kim, Jae-Gon ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 250~256
DOI : 10.5909/JBE.2014.19.2.250
Non-reference P frame coding is used to enhance coding efficiency in low-delay encoding configuration of Internet Video Coding (IVC), which is being standardized as a royalty-free video codec in MPEG. The existing method of non-reference P frame coding which was adopted in the reference Test Model of IVC (ITM) 4.0 adaptively applies a non-reference P frame with a fixed coding structure based on the magnitude of motion vectors (MVs), however, which unexpectedly degrades the coding efficiency for some sequences. In this paper, the existing non-reference P frame coding is improved by changing non-reference P frame coding structure and applying a new adaptive method using the ratio of the amount of generated bits of non-reference frames to that of reference frames as well as MVs. Experimental results show that the proposed non-reference P frame coding gives 6.6% BD-rate bit saving in average over ITM 7.0.
A Skip-mode Coding for Distributed Compressive Video Sensing
Nguyen, Quang Hong ; Dinh, Khanh Quoc ; Nguyen, Viet Anh ; Trinh, Chien Van ; Park, Younghyeon ; Jeon, Byeungwoo ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 257~267
DOI : 10.5909/JBE.2014.19.2.257
Distributed compressive video sensing (DCVS) is a low cost sampling paradigm for video coding based on the compressive sensing and the distributed video coding. In this paper, we propose using a skip-mode coding in DCVS under the assumption that in case of high temporal correlation, temporal interpolation can guarantee sufficiently good quality of nonkey frame, therefore no need to transmit measurement data in such a nonkey frame. Furthermore, we extend it to use a hierarchical structure for better temporal interpolation. Simulation results show that the proposed skip-mode coding can save the average subrate of whole video sequence while the PSNR is reduced only slightly. In addition, by using the proposed scheme, the computational complexity is also highly decreased at decoder on average by 43.75% for video sequences that have strong temporal correlation.
An Accurate Estimation of Channel Loss Threshold Set for Optimal FEC Code Rate Decision
Jung, Tae-Jun ; Jeong, Yo-Won ; Seo, Kwang-Deok ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 268~271
DOI : 10.5909/JBE.2014.19.2.268
Conventional forward error correction (FEC) code rate decision schemes using analytical source coding distortion model and channel-induced distortion model are usually complex, and require the typical process of model parameter training which involves potentially high computational complexity and implementation cost. To avoid the complex modeling procedure, we propose a simple but accurate joint source-channel distortion model to estimate channel loss threshold set for optimal FEC code rate decision.
Performance Analysis of Spectrum Sharing Cognitive Radio Networks over Double Rayleigh Fading Channels
Lee, Juhyun ; Lee, Jae Hong ;
Journal of Broadcast Engineering, volume 19, issue 2, 2014, Pages 272~275
DOI : 10.5909/JBE.2014.19.2.272
In this paper, the spectrum sharing cognitive radio network is investigated. For assuming that channels for the secondary network are double Rayleigh fading channels, we derive the exact and the approximate outage probabilities. Numerical results verify the validity of our theoretical analysis by comparison with Monte Carlo simulation results.