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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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Seam Carving based Occlusion Region Compensation Algorithm
An, Jae-Woo ; Yoo, Ji-Sang ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 573~583
DOI : 10.5909/JEB.2011.16.4.573
In this paper, we propose an occlusion compensation algorithm which is used for virtual view generation. In general, since occlusion region is recovered from neighboring pixels by taking the mean value or median value of neighbor pixels, the visual characteristics of a given image are not considered and consequently the accuracy of the compensated occlusion regions is not guaranteed. To solve these problem, we propose an algorithm that considers primary visual characteristics of a given image to compensate the occluded regions by using seam carving algorithm. In the proposed algorithm, we first use Sobel mask to obtain the edge map of a given image and then make it binary digit 0 or 1 and finally thinning process follows. Then, the energy patterns of original and thinned edge map obtained by the modified seam carving method are used to compensate the occlusion regions. Through experiments with many test images, we verify that the proposed algorithm performed better than conventional algorithms.
Stereoscopic Perception Improvement Using Color and Depth Transformation
Gil, Jong-In ; Jang, Seung-Eun ; Seo, Joo-Ha ; Kim, Man-Bae ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 584~595
DOI : 10.5909/JEB.2011.16.4.584
Recently, RGB images and depth maps have been supplied to academic fields. The depth maps are utilized to the generation of stereoscopic images in the diverse formats according to the users` preference. A variety of methods that use depth maps have been introduced so far. One of applications is a medical field. In this area, the improvement of the perceptual quality of 2D medical images has gained much interest. In this paper, we propose a novel scheme that expands the conventional method to 3D stereoscopic image, thereby achieving the perceptual depth quality improvement as well as 3D stereoscopic perception enhancement at the same time. For this, contrast transformation as well as depth darkening are proposed and their performance is validated through the subjective test. Subjective experiments peformed for stereoscopic enhancement as well as visual fatigue validate that the proposed method achieves better 3D perception than the usage of the original stereoscopic image and suggests the limitation in terms of the visual fatigue.
Real-time Stereo Video Generation using Graphics Processing Unit
Shin, In-Yong ; Ho, Yo-Sung ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 596~601
DOI : 10.5909/JEB.2011.16.4.596
In this paper, we propose a fast depth-image-based rendering method to generate a virtual view image in real-time using a graphic processor unit (GPU) for a 3D broadcasting system. Before the transmission, we encode the input 2D+depth video using the H.264 coding standard. At the receiver, we decode the received bitstream and generate a stereo video using a GPU which can compute in parallel. In this paper, we apply a simple and efficient hole filling method to reduce the decoder complexity and reduce hole filling errors. Besides, we design a vertical parallel structure for a forward mapping process to take advantage of the single instruction multiple thread structure of GPU. We also utilize high speed GPU memories to boost the computation speed. As a result, we can generate virtual view images 15 times faster than the case of CPU-based processing.
Hybrid Stereoscopic Camera System
Shin, Hyoung-Chul ; Kim, Sang-Hoon ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 602~613
DOI : 10.5909/JEB.2011.16.4.602
In this paper, we propose a hybrid stereoscopic camera system which acquires and utilizes stereoscopic images from two different camera modules, the main-camera module and the sub-camera module. Hybrid stereoscopic camera can effectively reduce the price and the size of a stereoscopic camera by using a relatively small and cheap sub-camera module such as a mobile phone camera. Images from the two different camera modules are very different from each other in aspects of color, angle of view, scale, resolution and so on. The proposed system performs an efficient hybrid stereoscopic image registration algorithm that transforms hybrid stereoscopic images into normal stereoscopic images based-on camera geometry. As experimental results, the registered stereoscopic images and applications of the proposed system are shown to demonstrate the performance and the functionality of the proposed camera system.
Real-Time Camera Tracking for Markerless Augmented Reality
Oh, Ju-Hyun ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 614~623
DOI : 10.5909/JEB.2011.16.4.614
We propose a real-time tracking algorithm for an augmented reality (AR) system for TV broadcasting. The tracking is initialized by detecting the object with the SURF algorithm. A multi-scale approach is used for the stable real-time camera tracking. Normalized cross correlation (NCC) is used to find the patch correspondences, to cope with the unknown and changing lighting condition. Since a zooming camera is used, the focal length should be estimated online. Experimental results show that the focal length of the camera is properly estimated with the proposed online calibration procedure.
Chroma Interpolation using FIR Filter and Linear Filter
Kim, Jeong-Pil ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 624~634
DOI : 10.5909/JEB.2011.16.4.624
Recently, the JCT-VC is developing the next generation video coding standard that is called HEVC. HEVC has adopted many coding technologies increasing coding efficiency. For chroma interpolation, DCT-based interpolation filter showing better performance than the linear filter in H.264/AVC was adopted in HEVC. In this paper, a combined filter that utilizes the FIR filter and the linear filter in H.264/AVC is proposed to increase coding efficiency. When the proposed method is compared with DCT-based interpolation filter, the experimental results for various sequences show that the average BD-rate improvements on chroma U and V components are 0.9% and 1.1%, respectively, in the high efficiency case of random access structure, those on U and V components are 1.1% and 1.1%, respectively, in the low complexity case of random access structure, those on U and V components are 0.9% and 1.4%, respectively, in the high efficiency case of low delay structure, and those on U and V components are 1.8% and 1.8%, respectively, in the low complexity case of low delay structure.
Adaptive Hard Decision Aided Fast Decoding Method using Parity Request Estimation in Distributed Video Coding
Shim, Hiuk-Jae ; Oh, Ryang-Geun ; Jeon, Byeung-Woo ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 635~646
DOI : 10.5909/JEB.2011.16.4.635
In distributed video coding, low complexity encoder can be realized by shifting encoder-side complex processes to decoder-side. However, not only motion estimation/compensation processes but also complex LDPC decoding process are imposed to the Wyner-Ziv decoder, therefore decoder-side complexity has been one important issue to improve. LDPC decoding process consists of numerous iterative decoding processes, therefore complexity increases as the number of iteration increases. This iterative LDPC decoding process accounts for more than 60% of whole WZ decoding complexity, therefore it can be said to be a main target for complexity reduction. Previously, HDA (Hard Decision Aided) method is introduced for fast LDPC decoding process. For currently received parity bits, HDA method certainly reduces the complexity of decoding process, however, LDPC decoding process is still performed even with insufficient amount of parity request which cannot lead to successful LDPC decoding. Therefore, we can further reduce complexity by avoiding the decoding process for insufficient parity bits. In this paper, therefore, a parity request estimation method is proposed using bit plane-wise correlation and temporal correlation. Joint usage of HDA method and the proposed method achieves about 72% of complexity reduction in LDPC decoding process, while rate distortion performance is degraded only by -0.0275 dB in BDPSNR.
An Efficient Search Method for Binary-based Block Motion Estimation
Lim, Jin-Ho ; Jeong, Je-Chang ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 647~656
DOI : 10.5909/JEB.2011.16.4.647
Motion estimation using one-bit transform and two-bit transform reduces the complexity for computation of matching error; however, the peak signal-to-noise ratio (PSNR) is degraded. Modified 1BT (M1BT) and modified 2BT (M2BT) have been proposed to compensate degraded PSNR by adding conditional local search. However, these algorithms require many additional search points in fast moving sequences with a block size of
. This paper provides more efficient search method by preparing candidate blocks using the number of non-matching points (NNMP) than the conditional local search. With this NNMP-based search, we can easily obtain candidate blocks with small NNMP and efficiently search final motion vector. Experimental results show that the proposed algorithm not only reduces computational complexity, but also improves PSNR on average compared with conventional search algorithm used in M1BT, M2BT and AM2BT.
Assessment of the Usability of Digital TV Remote Control Pointing Methods
Cheong, Kyeong-Kyun ; Kim, In-Soo ; Park, Sung-Kwon ; Park, Yong-Jin ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 657~668
DOI : 10.5909/JEB.2011.16.4.657
Along with the development of communication technology, DTV is gradually evolving into media that provide diverse services and information. This study is related with remote controls that control DTV interfaces and assessed the usability of remote pointing device. To this end, pointing devices using three different interaction methods that have been attempted recently by the industry were selected to conduct empirical experiments. The usability assessment was conducted centering on the existing directional task on straight tracks presented in ISO 9241-Part 9 and the steering tunnel task on curved tracks proposed in this study. The measurement variables included movement time, accuracy, throughput, subjective satisfaction and user behaviors. Based on the results of the assessment, in the case of movements on straight tracks, the GyroPoint method showed better implementing time but lower accuracy compared to the Hall Mouse and OFN methods while in the case of assessment on curved tracks, all of the GyroPoint method, Hall Mouse and OFN methods showed excellent results on both implementing time and accuracy. Besides, differences in efficiency and subjective satisfaction were shown among individual pointing devices. Based on these results, it is considered that individual pointing methods have different advantageous and disadvantageous characteristics. In this study, the usability of remote control pointing methods was assessed and diagnosed reflecting environments where DTVs are used through assessments considering the aspect of straight tracks along with curved tracks. Among others, this study is considered to be meaningful in that it provides assessment criteria and basic data for the development of remote controls suitable for the evolving DTV environments.
POCS Based Interpolation Method for Irregularly Sampled Image
Lee, Jong-Hwa ; Lee, Chul-Hee ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 669~679
DOI : 10.5909/JEB.2011.16.4.669
In this paper, we propose a POCS based irregularly sampled image interpolation method exploiting non-local block-based wavelet shrinkage denoising algorithm. The method provides convex sets to improve the performance. The Delaunay triangulation interpolation is first applied to interpolate the missing pixels of the irregularly sampled image into the regular grids. Then, the non-local block-based wavelet shrinkage denoising algorithm is applied, and the originally observed pixels are enforced. After iteration is performed, the denoising algorithm for non-edge areas is applied to acquire the final result. The experimental results show that the proposed method outperforms the conventional methods.
Performance of Typical 3-D Signal Constellations in Rayleigh Fading Channel
Chen, Zhenxing ; Choe, Chae-Cheol ; Kang, Seog-Geun ;
Journal of Broadcast Engineering, volume 16, issue 4, 2011, Pages 680~683
DOI : 10.5909/JEB.2011.16.4.680
In this paper, symbol error probability (SEP) of typical 3-dimensional (3-D) signal constellations in Rayleigh fading channel is derived. Simulation confirms that average SEP of the constellations is very accurate. Thus, the theoretical SEP derived can be exploited as a performance reference for future development of wireless communication systems with 3-D constellations.