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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 16, Issue 6 - Nov 2011
Volume 16, Issue 5 - Sep 2011
Volume 16, Issue 4 - Jul 2011
Volume 16, Issue 3 - May 2011
Volume 16, Issue 2 - Mar 2011
Volume 16, Issue 1 - Jan 2011
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An Efficient Approximation method of Adaptive Support-Weight Matching in Stereo Images
Kim, Ho-Young ; Lee, Seong-Won ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 902~915
DOI : 10.5909/JEB.2011.16.6.902
Recently in the area-based stereo matching field, Adaptive Support-Weight (ASW) method that weights matching cost adaptively according to the luminance intensity and the geometric difference shows promising matching performance. However, ASW requires more computational cost than other matching algorithms do and its real-time implementation becomes impractical. By applying Integral Histogram technique after approximating to the Bilateral filter equation, the computational time of ASW can be restricted in constant time regardless of the support window size. However, Integral Histogram technique causes loss of the matching accuracy during approximation process of the original ASW equation. In this paper, we propose a novel algorithm that maintains the ASW algorithm`s matching accuracy while reducing the computational costs. In the proposed algorithm, we propose Sub-Block method that groups the pixels within the support area. We also propose the method adjusting the disparity search range depending on edge information. The proposed technique reduces the calculation time efficiently while improving the matching accuracy.
Improvement of 3D Stereoscopic Perception Using Depth Map Transformation
Jang, Seong-Eun ; Jung, Da-Un ; Seo, Joo-Ha ; Kim, Man-Bae ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 916~926
DOI : 10.5909/JEB.2011.16.6.916
It is well known that high-resolution 3D movie contents frequently do not deliver the identical 3D perception to low-resolution 3D images. For solving this problem, we propose a novel method that produces a new stereoscopic image based on depth map transformation using the spatial complexity of an image. After analyzing the depth map histogram, the depth map is decomposed into multiple depth planes that are transformed based upon the spatial complexity. The transformed depth planes are composited into a new depth map. Experimental results demonstrate that the lower the spatial complexity is, the higher the perceived video quality and depth perception are. As well, visual fatigue test showed that the stereoscopic images deliver less visual fatigue.
Channel Estimation with Orthogonal Code in MIMO System
Park, Do-Hyun ; Kang, Eun-Su ; Han, Dong-Seog ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 927~940
DOI : 10.5909/JEB.2011.16.6.927
In this paper, we improve a time-domain channel estimation algorithm with multi-input multi-output (MIMO) systems for the next-generation digital television (DTV). The conventional algorithm use orthogonal codes for separating channels from the time-domain orthogonal frequency division multiplexing (OFDM) symbols. However. it has the disadvantage of reduced data-rate because of many pilots. The improved algorithm shows better performance than the conventional one even with reduced number of pilots. The improved algorithm is evaluated by computer simulations.
Implementation of Hand-Gesture-Based Augmented Reality Interface on Mobile Phone
Choi, Jun-Yeong ; Park, Han-Hoon ; Park, Jung-Sik ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 941~950
DOI : 10.5909/JEB.2011.16.6.941
With the recent advance in the performance of mobile phones, many effective interfaces for them have been proposed. This paper implements a hand-gesture-and-vision-based interface on a mobile phone. This paper assumes natural interaction scenario when user holds a mobile phone in a hand and sees the other hand`s palm through mobile phone`s camera. Then, a virtual object is rendered on his/her palm and reacts to hand and finger movements. Since the implemented interface is based on hand familiar to humans and does not require any additional sensors or markers, user freely interacts with the virtual object anytime and anywhere without any training. The implemented interface worked at 5 fps on mobile phone (Galaxy S2 having a dual-core processor).
Signaling and Multiplexing for Service-compatible 3DTV Broadcasting
Yun, Kug-Jin ; Lee, Bong-Ho ; Lee, Jin-Young ; Cheong, Won-Sik ; Hur, Nam-Ho ; Kim, Kyu-Heon ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 951~961
DOI : 10.5909/JEB.2011.16.6.951
This paper proposes a signaling and multiplexing mechanism in service-compatible 3DTV broadcasting for guaranteeing backward-compatibility with legacy DTV. Recently, 3DTV experimental broadcasting services are being developed around advanced countries and the standardization of service-compatible 3DTV broadcasting which is able to provide high-quality stereoscopic videos in progress. Based on experimental results, we confirm that proposed method can be used as a common technology and a reference model for stereoscopic video transmission over terrestial, satellite and cable DTV platforms in 3DTV broadcasting service and system development.
Lossless Color Image Compression using Inter-channel Correlation
Kim, Se-Yun ; Cho, Nam-Ik ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 962~968
DOI : 10.5909/JEB.2011.16.6.962
The conventional lossless compression of color images is to apply a compression method to each of color components separately, without considering the channel correlation. There had been several methods that consider the channel correlation, but they were confined to the compression of satellite or aerial images only, and the performance of these algorithms to general photos is not satisfactory. This paper proposes a new lossless color image compression method that exploits the correlation between the color components. Specifically, asymmetric sampling is applied to transform an image into mosaic image and the rest, which are compressed separately. By using the information from the compressed mosaic image, the rest images are predicted for further reducing the information to be compressed. Experimental results show that the proposed method improves the compression performance by 35% over the conventional separate compression methods and 10% over the existing methods that exploit the channel correlation.
Improved Hybrid MIMO Scheme for Next Generation Communication System
Jo, Bong-Gyun ; Han, Dong-Seog ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 969~976
DOI : 10.5909/JEB.2011.16.6.969
In this paper, a terrestrial transmission system is proposed for the next generation digital television (DTV) system by applying a hybrid multi-input multi-output (MIMO) technology based on linear dispersion codes (LDCs). The digital video broadcasting-2nd generation terrestrial (DVB-T2) system adopted a space time block code (STBC) for improving receive performance. However, the data rate of STBC is not increased in proportion to the transmitter. The hybrid STBC scheme utilizes several STBC transmission blocks for increasing data rate. It is possible to increase the data rate and performance in the receiver by utilizing LDC. The performances of the proposed and conventional hybrid STBC schemes are evaluated through computer simulations.
A Vector Perturbation Based User Selection for Multi-antenna Downlink Channels
Lee, Byung-Ju ; Lim, Chae-Hee ; Shim, Byong-Hyo ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 977~985
DOI : 10.5909/JEB.2011.16.6.977
Recent works on multiuser transmission techniques have shown that the linear growth of capacity in single user MIMO system can be translated to the multiuser MIMO scenario as well. In this paper, we propose a method pursuing performance gain of vector perturbation in multiuser downlink systems. Instead of employing maximum number of mobile users for communication, we use small part of them as virtual users for improving reliability of users participating communication. By controlling parameters of virtual users including information and perturbation vector, we obtain considerable improvement in the effective SNR, resulting in large gain in bit error rate performance. Simulation results on the realistic multiuser downlink systems show that the proposed method brings substantial performance gain over the standard vector perturbation with marginal overhead in computations.
Noise Whitening Decision Feedback Equalizer for SC-FDMA Receivers
Lee, Su-Kyoung ; Park, Yong-Hyun ; Seo, Bo-Seok ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 986~995
DOI : 10.5909/JEB.2011.16.6.986
In this paper, we propose a noise whitening decision feedback equalizer for single carrier frequency division multiple access (SC-FDMA) receivers. SC-FDMA has the same advantage as that of orthogonal frequency division multiple access (OFDMA) in which the multipath effect can be removed easily, and also solves the problem of high peak to average power ratio (PAPR) which is the main drawback of OFDMA. Although SC-FDMA is a single carrier transmission scheme, a simple frequency domain linear equalizer (FD-LE) can be implemented as in OFDMA, which can dramatically reduce the equalizer complexity. Moreover, some residual intersymbol interference in the output of the FD-LE can be further removed by an additional nonlinear decision feedback equalizer (DFE) in time domain, because the time domain signal is a digitally modulated symbol. In the conventional DFE, however, the noise is not white at the input of the decision device and correspondingly the decision is not optimum. In this paper, we propose an improved DFE scheme for SC-FDMA systems where a linear noise whitening filter is inserted before the decision device of the conventional DFE scheme. Through computer simulations, we compare the bit error rate performance of the proposed DFE scheme with the conventional equalizers.
PSNR Estimation of H.264/AVC Bitstream for Hierarchical- B Picture Structure
Seo, Jung-Dong ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 996~1008
DOI : 10.5909/JEB.2011.16.6.996
This paper proposes a PSNR estimation algorithm of H.264/AVC bitstream for hierarchical B-picture structure. The proposed method consists of a modeling method for DCT coefficients for I-pictures and an error estimation method for blocks encoded by skip mode. The modeling method selects an appropriate model between Laplacian and Cauchy model, and the error of skip mode is estimated from MSE values of reference pictures. Experimental results show that the modeling method predicts more accurate PSNR values than Laplacian and Cauchy model and the error estimation method of skip mode enhances PSNR estimation of hierarchical B-picture structure.
Fast Generation of Digital Hologram Based on Multi-GPU
Song, Joong-Seok ; Park, Jung-Sik ; Seo, Young-Ho ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1009~1017
DOI : 10.5909/JEB.2011.16.6.1009
Fast generation of digital hologram is of importance for real-time holography broadcasting. In this paper, we propose such a method that parallelizes the Computer-Generated Holography (CGH) algorithm for digital hologram generation and make it faster using Multi Graphic Processing Unit (Multi-GPU) with help of the Compute Unified Device Architecture (CUDA) and the Open Multi-Processing (OpenMP). In addition, we propose optimization methods such as fixation variable, vectorization, and loop unrolling for making the CGH algorithm much faster. Experimental results show that our method is about 9,700 times faster than a CPU-based one.
Implementation of H.264/SVC Decoder Based on Embedded DSP
Kim, Youn-Il ; Baek, Doo-San ; Kim, Jae-Gon ; Kim, Jin-Soo ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1018~1025
DOI : 10.5909/JEB.2011.16.6.1018
Scalable Video Coding (SVC) extension of H.264/AVC is a new video coding standard for media convergence by providing diverse videos of different spatial-temporal-quality layers with a single bitstream. Recently, real-time SVC codecs are being developed for the application areas of surveillance video and mobile video, etc. This paper presents the design and implementation of a H.264/SVC decoder based on an embedded DSP using Open SVC Decoder (OSD) which is a real-time software decoder designed for the PC environment. The implementation consists of porting C code of the OSD software from PC to DSP environment, profiling the complexity performance of OSD with further optimization, and integrating the optimized decoder into the TI Davinci EVM (Evaluation Module). 50 QCIF/CIF frames or 15 SD frames per second can be decoded with the implemented DSP-based SVC decoder.
LLR Based Generalization of Soft Decision Iterative Decoding Algorithms for Block Turbo Codes
Im, Hyun-Ho ; Kwon, Kyung-Hoon ; Heo, Jun ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1026~1035
DOI : 10.5909/JEB.2011.16.6.1026
This paper presents generalization and application for the conventional SISO decoding algorithm of Block Turbo Codes. R. M. Pyndiah suggested an iterative SISO decoding algorithm for Product Codes, two-dimensionally combined linear block codes, on AWGN channel. It wascalled Block Turbo Codes. Based on decision of Chase algorithm which is SIHO decoding method, SISO decoder for BTC computes soft decision information and transfers the information to next decoder for iterative decoding. Block Turbo Codes show Shannon limit approaching performance with a little iteration at high code rate on AWGN channel. In this paper we generalize the conventional decoding algorithm of Block Turbo Codes, under BPSK modulation and AWGN channel transmission assumption, to the LLR value based algorithm and suggest an application example such as concatenated structure of LDPC codes and Block Turbo Codes.
Non-fixed Quantization Considering Entropy Encoding in HEVC
Gweon, Ryeong-Hee ; Han, Woo-Jin ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1036~1046
DOI : 10.5909/JEB.2011.16.6.1036
MPEG and VCEG have constituted a collaboration team called JCT-VC(Joint Collaborative Team on Video Coding) and have been developing HEVC(High Efficiency Video Coding) standard. All transform coefficients in a TU(Transform Unit) have been equally quantized according to the quantization and inverse quantization method which is used in HEVC standard. Such an equal quantization is not efficient because the transformed coefficients in the TU are not eqully distributed. Furthermore, the quantized coefficients which is positioned in later scanning order cannot be efficient due to the entropy scanning method. We suggest an algorithm that transform coefficients are quantized at different values according to the position in TU considering a scanning order of entropy encoding to improve the coding efficiency. The principle of this algorithm is that quantization and inverse quantization are carried out according to the scanning order which is in accordance with the statistical characteristic of distribution of quantized transform coefficients. The proposed algorithm shows on the average of 0.34% Y BD-rate compression rate improvement.
Automatic Dynamic Range Improvement Method using Histogram Modification and K-means Clustering
Cha, Su-Ram ; Kim, Jeong-Tae ; Kim, Min-Seok ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1047~1057
DOI : 10.5909/JEB.2011.16.6.1047
In this paper, we propose a novel tone mapping method that implements histogram modification framework on two local regions that are classified using K-means clustering algorithm. In addition, we propose automatic parameter tuning method for histogram modification. The proposed method enhances local details better than the global histogram method. Moreover, the proposed method is fully automatic in the sense that it does not require intervention from human to tune parameters that are involved for computing tone mapping functions. In simulations and experimental studies, the proposed method showed better performance than existing histogram modification method.
Distortion Estimation Using Block-Adaptive Matching Characteristics for Motion Compensated Interpolation Frame
Kim, Jin-Soo ; Kim, Jae-Gon ; Seo, Kwang-Deok ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1058~1068
DOI : 10.5909/JEB.2011.16.6.1058
Video FRUC (Frame Rate Up Conversion) is one of the main issues that have arisen in recent years with the explosive growth of video sources and display formats in consumer electronics. Most advanced FRUC algorithms adopt an efficient motion interpolation technique to determine the motion vector field of interpolated frames. But, in some application areas such as post processing in receiver side, it is necessary to evaluate how well the MCI (Motion Compensated Interpolation) frame was reconstructed. In order to achieve this aim, first, this paper introduces some cost functions to estimate the reliability of a block in the MCI frame. Then, by using these functions, this paper proposes two distortion estimation models for evaluating how much noise was produced in the MCI frame. Through computer simulations, it is shown that the proposed estimation methods perform effectively in estimating the noises of the MCI frame.
Coding Efficiency Improvement for Identical Motion Information of Bi-prediction Mode within the GPB Slcice of HEVC
Kim, Sang-Min ; Kim, Kyung-Yong ; Park, Gwang-Hoon ; Kim, Hui-Yong ; Lim, Sung-Chang ; Lee, Jin-Ho ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1069~1072
DOI : 10.5909/JEB.2011.16.6.1069
This paper proposes the method which reduces complexity and improves coding efficiency by solving a problem of HEVC bi-prediction. In current HM 3.0, it is frequently occurred that L0 motion information and L1 motion information are identical in blocks which are bi-predicted. In this case, L1 motion vector is replaced by non-zero motion vector which belongs to first available neighbor block of current block. If they are still identical, prediction mode is replaced by uni-prediction. As an experimental result, in LD(Low-Delay) case, decoding time is reduced roughly 2%~5% and coding gain is roughly 0.3%~0.5% compared with the HM 3.0 anchor.
Scalable Random Access for SVC-based DASH Service
Seo, Kwang-Deok ; Lee, Hong-Rae ; Kim, Jae-Gon ; Jung, Soon-Heung ; Yoo, Jeong-Ju ; Jeong, Young-Ho ;
Journal of Broadcast Engineering, volume 16, issue 6, 2011, Pages 1073~1076
DOI : 10.5909/JEB.2011.16.6.1073
In this paper, we propose a scalable random access scheme in SVC based DASH service that enables random access support not only for base layer of SVC but also for enhancement layers. The proposed method includes extension of segment index box (`sidx`) from DASH standard, as well as new RAP Synchronization Box (`raps`). Since the proposed scheme provides random access service for movie fragments with SVC encoded video layers, adaptive scalable random access service is possible.