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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 20, Issue 6 - Nov 2015
Volume 20, Issue 5 - Sep 2015
Volume 20, Issue 4 - Jul 2015
Volume 20, Issue 3 - May 2015
Volume 20, Issue 2 - Mar 2015
Volume 20, Issue 1 - Jan 2015
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Subjective Listening Test based on Frontal Loudspeaker Array Reproduction System
Yoo, Jae-hyoun ; Jang, Daeyoung ; Lee, Taejin ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 667~675
DOI : 10.5909/JBE.2015.20.5.667
As the interest on the high-definition and high-quality broadcasting is increased, the request on the high quality sound signal is enlarged as well as on the video signal's quality. One factor contributing to the high-quality of audio signal is an expansion of reproduction channels like 10.2channel and 22.2channel, but there is a problem of speaker installation issue of these many channels. One solution to solve this problem, we can use frontal loudspeaker array reproduction technique making virtual surround sound. So in this paper, we introduce theocratical analysis on the Wave Field Synthesis used for speaker array based sound reproduction and also present the result about the subjective listening test of reproduction performance based on this technique to check the perfoemance of this system. As a result, we showed WFS based frontal loudspeaker array reproduction method could provide sufficient performance compared to conventional discrete 5.1 channel reproduction method.
Dictionary Learning based Superresolution on 4D Light Field Images
Lee, Seung-Jae ; Park, In Kyu ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 676~686
DOI : 10.5909/JBE.2015.20.5.676
A 4D light field image is represented in traditional 2D spatial domain and additional 2D angular domain. The 4D light field has a resolution limitation both in spatial and angular domains since 4D signals are captured by 2D CMOS sensor with limited resolution. In this paper, we propose a dictionary learning-based superresolution algorithm in 4D light field domain to overcome the resolution limitation. The proposed algorithm performs dictionary learning using a large number of extracted 4D light field patches. Then, a high resolution light field image is reconstructed from a low resolution input using the learned dictionary. In this paper, we reconstruct a 4D light field image to have double resolution both in spatial and angular domains. Experimental result shows that the proposed method outperforms the traditional method for the test images captured by a commercial light field camera, i.e. Lytro.
Performance Analysis of Screen Contents Coding Tools to Reduce Inter-Color Component Correlation
Kang, Je-Won ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 687~696
DOI : 10.5909/JBE.2015.20.5.687
JCT-VC (Joint Collaborative Team on Video Coding) continues developing HEVC/Screen Content Coding (HEVC/SCC) as an extension for efficiently coding screen content videos, including computer animations, graphics, and electrical documents, based on HEVC/Range extension (HEVC/RExt.). Color space conversion from RGB space being captured from CCD sensors is popular in natural video coding. However, the conversion is often undesired for screen contents because of a significant loss in perceptual quality. Therefore, several coding tools including cross-component prediction (CCP) and in-loop adaptive color space transform (ACST) have been developed for an efficient screen content video coding in order to reduce the redundancies between color spaces while maintaining the original color space. In this paper, we review the two coding tools, i.e., CCP and ACST exploiting the correlation in the RGB color space and conduct the performance analysis of the coding tools. In our simulation results, CCP and ACST provide 11.7% BD-rate saving and 16.4% BD-rate saving, respectively, while the two coding tools provide 18.2% BD-rate saving in total. Following this idea, if the two coding tools are exclusively selected, we provide 93% encoding measurement time with a 0.3% coding loss.
High-Speed and High-Quality Haze Removal Method Based on Dual Dark Channels
Moon, Sun-A ; Kim, Won-Tae ; Kim, Tae-Hwan ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 697~705
DOI : 10.5909/JBE.2015.20.5.1
This paper proposes a high-speed and high-quality haze removal method based on dual dark channels. In the conventional method, the halo artifacts are suppressed by the additional transmission refinement, but the transmission refinement is computationally intensive and the quality of the haze removal is sometimes unsatisfactory because of the residual halo artifacts. In the proposed method, the transmission is estimated with the mixture of the two dark channels with different window size. By mixing the two dark channels so as to avoid the halo artifacts, the proposed method realizes a high-quality haze removal even without the transmission refinement. Experimental results demonstrate that the quality of the results by the proposed method is superior to those by the conventional method and the speed of the haze removal is about 14.2 times higher than that of the conventional method.
Fast Hologram Generating of 3D Object with Super Multi-Light Source using Parallel Distributed Computing
Song, Joongseok ; Kim, Changseob ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 706~717
DOI : 10.5909/JBE.2015.20.5.706
The computer generated hologram (CGH) method is the technology which can generate a hologram by using only a personal computer (PC) commonly used. However, the CGH method requires a huge amount of calculational time for the 3D object with a super multi-light source or a high-definition hologram. Hence, some solutions are obviously necessary for reducing the computational complexity of a CGH algorithm or increasing the computing performance of hardware. In this paper, we propose a method which can generate a digital hologram of the 3D object with a super multi-light source using parallel distributed computing. The traditional methods has the limitation of improving CGH performance by using a single PC. However, the proposed method where a server PC efficiently uses the computing power of client PCs can quickly calculate the CGH method for 3D object with super multi-light source. In the experimental result, we verified that the proposed method can generate the digital hologram with 1,5361,536 resolution size of 3D object with 157,771 light source in 121 ms. In addition, in the proposed method, we verify that the proposed method can reduce generation time of a digital hologram in proportion to the number of client PCs.
Video Segmentation Using DCT and Guided Filter in real time
Shin, Hyunhak ; Lee, Zucheul ; Kim, Wonha ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 718~727
DOI : 10.5909/JBE.2015.20.5.718
In this paper, we present a novel segmentation method that can extract new foreground objects from a current frame in real-time. It is performed by detecting differences between the current frame and reference frame taken from a fixed camera. We minimize computing complexity for real-time video processing. First DCT (Discrete Cosine Transform) is utilized to generate rough binary segmentation maps where foreground and background regions are separated. DCT shows better result of texture analysis than previous methods where texture analysis is performed in spatial domain. It is because texture analysis in frequency domain is easier than that in special domain and intensity and texture in DCT are taken into account at the same time. We maximize run-time efficiency of DCT by considering color information to analyze object region prior to DCT process. Last we use Guided filter for natural matting of the generated binary segmentation map. In general, Guided filter can enhance quality of intermediate result by incorporating guidance information. However, it shows some limitations in homogeneous area. Therefore, we present an additional method which can overcome them.
Fast Stitching Algorithm by using Feature Tracking
Park, Siyoung ; Kim, Jongho ; Yoo, Jisang ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 728~737
DOI : 10.5909/JBE.2015.20.5.728
Stitching algorithm obtain a descriptor of the feature points extracted from multiple images, and create a single image through the matching process between the each of the feature points. In this paper, a feature extraction and matching techniques for the creation of a high-speed panorama using video input is proposed. Features from Accelerated Segment Test(FAST) is used for the feature extraction at high speed. A new feature point matching process, different from the conventional method is proposed. In the matching process, by tracking region containing the feature point through the Mean shift vector required for matching is obtained. Obtained vector is used to match the extracted feature points. In order to remove the outlier, the RANdom Sample Consensus(RANSAC) method is used. By obtaining a homography transformation matrix of the two input images, a single panoramic image is generated. Through experimental results, we show that the proposed algorithm improve of speed panoramic image generation compared to than the existing method.
Improved Haze Removal Algorithm by using Color Normalization and Haze Rate Compensation
Kim, Jong-Hyun ; Cha, Hyung-Tai ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 738~747
DOI : 10.5909/JBE.2015.20.5.738
It is difficult to use a recognition algorithm of an image in a foggy environment because the color and edge information is removed. One of the famous defogging algorithm is haze removal by using 'Dark Channel Prior(DCP)' which is used to predict for transmission rate using color information of an image and eliminates fog from the image. However, in case that the image has factors such as sunset or yellow dust, there is overemphasized problem on the color of certain channel after haze removal. Furthermore, in case that the image includes an object containing high RGB channel, the transmission related to this area causes a misestimated issue. In this paper, we purpose an enhanced fog elimination algorithm by using improved color normalization and haze rate revision which correct mis-estimation haze area on the basis of color information and edge information of an image. By eliminating the color distortion, we can obtain more natural clean image from the haze image.
Sharing based Admission Control Scheme for Service Differentiation in Optical Burst Switching Networks
Paik, Junghoon ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 748~755
DOI : 10.5909/JBE.2015.20.5.748
In this paper, sharing based admission control scheme is suggested for both service differentiation and improvement of wavelength utilization efficiency in burst switching networks. To provide service differentiation and high wavelength utilization efficiency, some of the wavelengths on a output link are shared with all classes and the others are used for the highest class exclusively. Markov based analysis is applied to the suggested scheme for the performance analysis and the numerical results are derived. The results are: The performance of lower traffic is more improved by the more number of shared wavelengths in case that the higher traffic or lower traffic is arrived equally or that the input rate of lower traffic is low. Another result is that the sharing effect of wavelengths is a little bit lowered when lower traffic passes the threshold.
Layered Coding Method for Scalable Coding of HDR and SDR videos
Lim, Jeongyun ; Ahn, Yong-Jo ; Lim, Woong ; Park, Seanae ; Sim, Donggyu ; Kang, Jung-Won ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 756~769
DOI : 10.5909/JBE.2015.20.5.756
In this paper, we propose a scalable coding method for high dynamic range (HDR) and standard dynamic range (SDR) videos based on Scalable High Efficiency Video Coding (SHVC). The proposed method has multi-layer coding architecture that consists of base layer for SDR videos and enhancement layer for HDR videos to support the backward compatibility with legacy codec and display devices. Also, to improve coding efficiency of enhancement layers, a global inverse tone mapping is applied to the reconstructed SDR video and the compensated frames are referred for coding of the enhancement layer. The proposed method is found to achieve BD-Rate gain of 43.0% on average (maximum 76.3%) for the enhancement layer and 15.7% on average (maximum 31%) for dual-layer against the SHM 7.0 reference software.
Efficient Color Image Enhancement Technique using Saturation Components of Color Images
Kim, Jin Ho ; Gil, Min Kyun ; Lee, Chang Woo ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 770~773
DOI : 10.5909/JBE.2015.20.5.770
The contrast of the intensity components of color images usually needs to be improved in order to enhance the visual quality of color images. However, pure color regions can be saturated due to the excessive enhancement of that color. In this paper, a new method for enhancing the visual quality of color images using saturation components in the HSI color space is proposed, and the same enhancement technique in the YCbCr color space is proposed. Computer simulations show that the proposed method provides improved visual quality compared to the conventional methods.
Programmable Multimedia Platform for Video Processing of UHD TV
Kim, Jaehyun ; Park, Goo-man ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 774~777
DOI : 10.5909/JBE.2015.20.5.774
This paper introduces the world's first programmable video-processing platform for the enhancement of the video quality of the 8K(7680x4320) UHD(Ultra High Definition) TV operating up to 60 frames per second. In order to support required computing capacity and memory bandwidth, the proposed platform implemented several key features such as symmetric multi-cluster architecture for parallel data processing, a ring-data path between the clusters for data pipelining and hardware accelerators for computing filter operations. The proposed platform based on RP(Reconfigurable Processor) processes video quality enhancement algorithms and handles effectively new UHD broadcasting standards and display panels.
Enhanced Boundary Partition Color Descriptor for Deformable Object Retrieval
Jung, Hyun-il ; Kim, Hae-kwang ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 778~781
DOI : 10.5909/JBE.2015.20.5.778
The paper presents a new way of visual descriptor for deformable object retrieval on the basis of partition based description. The proposed descriptor technology partitions a given object into boundary area and interior area and extracts a descriptor from each area. The final descriptor combines these descriptors. From a given image, deformable object is segmented. The center position of the deformable object is calculated. The object is partitioned into N × N blocks on the basis of the given center position. Blocks are classified as boundary area and interior area depending on the pixels in the block. The proposed descriptor consists of extracted MPEG-7 dominant descriptors from both the boundary and interior area. The performance of proposed method is tested on a database of 1,973 handbag images constructed with view point changes. ARR (Average Retrieval Rate) is used for the retrieval accuracy of the proposed algorithm, compared with MPEG-7 dominant color descriptor.
Adaptive Residual DPCM using Weighted Linear Combination of Adjacent Residues in Screen Content Video Coding
Kang, Je-Won ;
Journal of Broadcast Engineering, volume 20, issue 5, 2015, Pages 782~785
DOI : 10.5909/JBE.2015.20.5.78
In this paper, we propose a novel residual differential pulse-code modulation (RDPCM) coding technique to improve coding efficiency of screen content videos. The proposed method uses a weighted combination of adjacent residues to provide an accurate estimate in RDPCM. The weights are trained in previously coded samples by using an L1 optimization problem with the least absolute shrinkage and selection operation (LASSO). The proposed method achieves BD-rate saving about 3.1% in all-intra coding.