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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
A New Overlap Save Algorithm for Fast Convolution
Kuk, Jung-Gap ; Cho, Nam-Ik ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 543~550
DOI : 10.5909/JBE.2009.14.5.543
The most widely used block convolution method is the overlap save algorithm (OSA), where a block of M data to be convolved with a filter is concatenated with the previous block and 2M-point FFT and multiplications are performed for this overlapped block. By discarding half of the results, we obtain linear convolution results from the circular convolution. This paper proposes a new transform which reduces the block size to only M for the block convolution. The proposed transform can be implemented as the M multiplications followed by M-point FFT Hence, existing efficient FFT libraries and hardware can be exploited for the implementation of proposed method. Since the required transform size is half that of the conventional method, the overall computational complexity is reduced. Also the reduced transform size results in the reduction of data access time and cash miss-hit ratio, and thus the overall CPU time is reduced. Experiments show that the proposed method requires less computation time than the conventional OSA.
Bit-plane based Lossless Depth Map Coding Method
Kim, Kyung-Yong ; Park, Gwang-Hoon ; Suh, Doug-Young ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 551~560
DOI : 10.5909/JBE.2009.14.5.551
This paper proposes a method for efficient lossless depth map coding for MPEG 3D-Video coding. In general, the conventional video coding method such as H.264 has been used for depth map coding. However, the conventional video coding methods do not consider the image characteristics of the depth map. Therefore, as a lossless depth map coding method, this paper proposes a bit-plane based lossless depth mar coding method by using the MPEG-4 Part 2 shape coding scheme. Simulation results show that the proposed method achieves the compression ratios of 28.91:1. In intra-only coding, proposed method reduces the bitrate by 24.84% in comparison with the JPEG-LS scheme, by 39.35% in comparison with the JPEG-2000 scheme, by 30.30% in comparison with the H.264(CAVLC mode) scheme, and by 16.65% in comparison with the H.264(CABAC mode) scheme. In addition, in intra and inter coding the proposed method reduces the bitrate by 36.22% in comparison with the H.264(CAVLC mode) scheme, and by 23.71% in comparison with the 0.264(CABAC mode) scheme.
Layer-separable PES Packetization and Processing Scheme for SVC-based Satellite Broadcasting Service
Chi, Won-Sup ; Seo, Kwang-Deok ; Kim, Jin-Soo ; Lee, In-Ki ; Chang, Dae-Ig ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 561~572
DOI : 10.5909/JBE.2009.14.5.561
In this paper, we propose an efficient layer-separable PES packetization and processing scheme for DVB-S2 satellite broadcasting service based on SVC video. Unlike the conventional single layer-based video coding such as MPEG-2, MPEG-4 and H.264, SVC can combine numerous number of video layers, which are aggregated to a single bitstream. Therefore, it is necessary to devise a new PES packetization scheme that can efficiently separate multiple video layers of SVC. In order to combine the layered characteristics of the SVC video and the robust channel coding capability of LDPC (Low Density Parity Check) of DVB-S2 for unequal error protection, we propose an efficient PES packetization in the transmitter side and PES packet processing scheme in the receiver side of DVB-S2. We prove the effectiveness of the proposed scheme in terms of processing speed and time delay required for processing of the separated layers of SVC video in the satellite broadcasting service.
A Nobel Video Quality Degradation Monitoring Schemes Over an IPTV Service with Packet Loss
Kwon, Jae-Cheol ; Oh, Seoung-Jun ; Suh, Chang-Ryul ; Chin, Young-Min ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 573~588
DOI : 10.5909/JBE.2009.14.5.573
In this paper, we propose a novel video quality degradation monitoring scheme titled VR-VQMS(Visual Rhythm based Video Quality Monitoring Scheme) over an IPTV service prone to packet losses during network transmission. Proposed scheme quantifies the amount of quality degradation due to packet losses, and can be classified into a RR(reduced-reference) based quality measurement scheme exploiting visual rhythm data of H.264-encoded video frames at a media server and reconstructed ones at an Set-top Box as feature information. Two scenarios, On-line and Off-line VR-VQMS, are proposed as the practical solutions. We define the NPSNR(Networked Peak-to-peak Signal-to-Noise Ratio) modified by the well-known PSNR as a new objective quality metric, and several additional objective and subjective metrics based on it to obtain the statistics on timing, duration, occurrence, and amount of quality degradation. Simulation results show that the proposed method closely approximates the results from 2D video frames and gives good estimation of subjective quality(i.e.,MOS(mean opinion score)) performed by 10 test observers. We expect that the proposed scheme can play a role as a practical solution to monitor the video quality experienced by individual customers in a commercial IPTV service, and be implemented as a small and light agent program running on a resource-limited set-top box.
Uni-directional 8X8 Intra Prediction for H.264 Coding Efficiency
Kook, Seung-Ryong ; Park, Gwang-Hoon ; Lee, Yoon-Jin ; Sim, Dong-Gyu ; Jung, Kwang-Soo ; Choi, Hae-Chul ; Choi, Jin-Soo ; Lim, Sung-Chang ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 589~600
DOI : 10.5909/JBE.2009.14.5.589
This paper is ready to change a trend of a ultra high definition (UHD) video image, and it will contribute to improve the performance of the latest H.264 through the Uni-directional
intra-prediction idea which is based on developing a intra prediction compression. The Uni-directional
intra prediction is focused on a
block intra prediction using
block based prediction which is using the same direction of intra prediction. This paper describes that the uni-directional
intra-prediction gets a improvement around 7.3% BDBR only in the
block size, and it gets a improvement around 1.3% BDBR in the H.264 applied to the multi block size structures. In the case of a larger image size, it can be changed to a good algorithm. Because the video codec which is optimized for UHD resolution can be used a different block size which is bigger than before(currently a minimum of
blocks of units).
Adaptive Block-based Depth-map Coding Method
Kim, Kyung-Yong ; Park, Gwang-Hoon ; Suh, Doug-Young ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 601~615
DOI : 10.5909/JBE.2009.14.5.601
This paper proposes an efficient depth-map coding method for generating virtual-view images in 3D-Video. Virtual-view images can be generated by the view-interpolation based on the depth-map of the image. A conventional video coding method such as H.264 has been used. However, a conventional video coding method does not consider the image characteristics of the depth-map. Therefore, this paper proposes an adaptive depth-map coding method that can select between the H.264/AVC coding scheme and the proposed gray-coded bit plane-based coding scheme in a unit of block. This improves the coding efficiency of the depth-map data. Simulation results show that the proposed method, in comparison with the H.264/AVC coding scheme, improves the average BD-rate savings by 7.43% and the average BD-PSNR gains by 0.5dB. It also improves the subjective picture quality of synthesized virtual-view images using decoded depth-maps.
3DTIP: 3D Stereoscopic Tour-Into-Picture of Korean Traditional Paintings
Jo, Cheol-Yong ; Kim, Man-Bae ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 616~624
DOI : 10.5909/JBE.2009.14.5.616
This paper presents a 3D stereoscopic TIP (Tour Into Picture) for Korean classical paintings being composed of persons, boat, and landscape. Unlike conventional TIP methods providing 2D image or video, our proposed TIP can provide users with 3D stereoscopic contents. Navigating a picture with stereoscopic viewing can deliver more realistic and immersive perception. The method firstly makes input data being composed of foreground mask, background image, and depth map. The second step is to navigate the picture and to obtain rendered images by orthographic or perspective projection. Then, two depth enhancement schemes such as depth template and Laws depth are utilized in order to reduce a cardboard effect and thus to enhance 3D perceived depth of the foreground objects. In experiments, the proposed method was tested on 'Danopungjun' and 'Muyigido' that are famous paintings made in Chosun Dynasty. The stereoscopic animation was proved to deliver new 3D perception compared with 2D video.
A Personalized Automatic TV Program Scheduler using Sequential Pattern Mining
Pyo, Shin-Jee ; Kim, Eun-Hui ; Kim, Mun-Churl ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 625~637
DOI : 10.5909/JBE.2009.14.5.625
With advent of TV environment and increasing of variety of program contents, users are able to experience more various and complex environment for watching TV contents. According to the change of content watching environment, users have to make more efforts to choose his/her interested TV program contents or TV channels than before. Also, the users usually watch the TV program contents with their own regular way. So, in this paper, we suggests personalized TV program schedule recommendation system based on the analyzing users' TV watching history data. And we extract the users' watched program patterns using the sequential pattern mining method. Also, we proposed a new sequential pattern mining which is suitable for TV watching environment and verify our proposed method have better performance than existing sequential pattern mining method in our application area. In the future, we will consider a VoD characteristic for extending to IPTV program schedule recommendation system.
Geometric analysis and anti-aliasing filter for stereoscopic 3D image scaling
Kim, Wook-Joong ; Hur, Nam-Ho ; Kim, Jin-Woong ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 638~649
DOI : 10.5909/JBE.2009.14.5.638
Image resizing (or scaling) is one of the most essential issues for the success of visual service because image data has to be adapted to the variety of display features. For 2D imaging, the image scaling is generally accomplished by 2D image re-sampling (i.e., up-/down-sampling). However, when it comes to stereoscopic 3D images, 2D re-sampling methods are inadequate because additional consideration on the third dimension of depth is not incorporated. Practically, stereoscopic 3D image scaling is process with left/right images, not stereoscopic 3D image itself, because the left/right Images are only tangible data. In this paper, we analyze stereoscopic 3D image scaling from two aspects: geometrical deformation and frequency-domain aliasing. A number of 3D displays are available in the market and they have various screen dimensions. As we have more varieties of the displays, efficient stereoscopic 3D image scaling is becoming more emphasized. We present the recommendations for the 3D scaling from the geometric analysis and propose a disparity-adaptive filter for anti-aliasing which could occur during the image scaling process.
Performance of a Turbo-Coded CDMA System in an Indoor Wireless Infrared Channel
Kim, Jin-Young ; Yoon, Sung-Roh ; Heo, Jun ;
Journal of Broadcast Engineering, volume 14, issue 5, 2009, Pages 650~653
DOI : 10.5909/JBE.2009.14.5.650
Turbo-coded CDMA system is analyzed and simulated in an indoor wireless infrared channel. The indoor infrared channel is modeled as a non-directed diffuse link. From the simulation results, it is confirmed that the turbo coding is very effective in improving BER (bit error rate) performance, and outperforms BCH code.