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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 11, Issue 4 - Dec 2006
Volume 11, Issue 3 - Sep 2006
Volume 11, Issue 2 - Jun 2006
Volume 11, Issue 1 - Mar 2006
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Efficient De-quantization Method based on Quantized Coefficients Distribution for Multi-view Video Coding
Park, Seung-Wook ; Jeon, Byeong-Moon ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 386~395
Multi-view video coding technology demands the very high efficient coding technologies, because it has to encode a number of video sequences which are achieved from a number of video cameras. For this purpose, multi-view video coding introduces the inter-view prediction scheme between different views, but it shows a limitation of coding performance enhancement by adopting only new prediction method. Accordingly, we are going to achieve the more coding performance by enhancing dequantizer perfermance. Multi-view video coding is implemented basically based on H.264/AVC and uses the same quantization/de-quantization method as H.264/AVC does. The conventional quantizer and dequantizer is designed with the assumption that input residual signal follows the Laplacian PDF. However, it doesn't follow the fixed PDF type always. This mismatch between assumption and real data causes degradation of coding performance. To solve this problem, we propose the efficient de-quantization method based on quantized coefficients distribution at decoder without extra information. The extensive simulation results show that the proposed algorithm produces maximum
at high bitrate compared with that of conventional method.
Omni-directional Image Generation Algorithm with Parametric Image Compensation
Kim, Yu-Na ; Sim, Dong-Gyu ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 396~406
This paper proposes an omni-directional image generation algorithm with parametric image compensation. The algorithm generates an omni-directional image by transforming each planar image to the spherical image on spherical coordinate. Parametric image compensation method is presented in order to compensate vignetting and illumination distortions caused by properties of a camera system and lighting condition. The proposed algorithm can generates realistic and seamless omni-directional video and synthesize any point of view from the stitched omni-directional image on the spherical image. Experimental results show that the proposed omni-directional system with vignetting and illumination compensation is approximately
better than that which does not consider the said effects.
Adaptive illumination change compensation method for multi-view video coding
Hur, Jae-Ho ; Cho, Suk-Hee ; Hur, Nam-Ho ; Kim, Jin-Woong ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 407~419
In this paper, an adaptive illumination change compensation method is proposed for multi-view video coding. In multi-view video, an illumination change can occur due to physically imperfect camera calibration, each different camera position and direction, and so on. These characteristics can cause a performance decrease in the multi-view video coding that uses an inter-view prediction by referring to the pictures obtained from the neighboring views. By using the proposed method, a compression ratio of the proposed method in the multi-view video coding is increased, and finally
PSNR(Peak Signal-to-Noise Ratio) improvement was obtained compared with the case of not using the proposed method.
Flexible GGOP prediction structure for multi-view video coding
Yoon, Jae-Won ; Seo, Jung-Dong ; Kim, Yong-Tae ; Park, Chang-Seob ; Sohn, Kwang-Hoon ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 420~430
In this paper, we propose a flexible GGOP prediction structure to improve coding efficiency for multi-view video coding. In general, reference software used for MVC uses the fixed GGOP prediction structure. However, the performance of MVC depends on the base view and numbers of B-pictures between I-picture(or P-picture) and P-picture. In order to implement the flexible GGOP prediction structure, the location of base view is decided according to the global disparities among the adjacent sequences. Numbers of B-pictures between I-picture(or P-picture) and P-picture are decided by camera arrangement such as the baseline distance among the cameras. The proposed method shows better result than the reference software of MVC. The proposed prediction structure shows considerable reduction of coded bits by 7.1%.
3D Gaze Estimation and Interaction Technique
Ki, Jeong-Seok ; Jeon, Kyeong-Won ; Kim, Sung-Kyu ; Sohn, Kwang-Hoon ; Kwon, Yong-Moo ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 431~440
There are several researches on 2D gaze tracking techniques for the 2D screen for the Human-Computer Interaction. However, the researches for the gaze-based interaction to the stereo images or contents are not reported. The 3D display techniques are emerging now for the reality service. Moreover, the 3D interaction techniques are much more needed in the 3D contents service environments. This paper addresses gaze-based 3D interaction techniques on stereo display, such as parallax barrier or lenticular stereo display. This paper presents our researches on 3D gaze estimation and gaze-based interaction to stereo display.
Multi-focus 3D display of see-through Head-Mounted Display type
Kim, Dong-Wook ; Yoon, Seon-Kyu ; Kim, Sung-Kyu ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 441~447
See-through HMD type 3D display can provide an advantage of us seeing virtual 3D data used stereoscopic display simultaneously with real object(MR-Mixed Reality). But, when user sees stereoscopic display for a long time, not only eye fatigue phenomenon happens but also de-focus phenomenon of data happens by fixed focal point of virtual data. Dissatisfaction of focus adjustment of eye can be considered as the important reason of this phenomenon. In this paper, We proposed an application of multi-focus in see-through HMD as a solution of this problem. As a result, we confirmed that the focus adjustment coincide between the object of real world and the virtual data by multi-focus in monocular condition.
Improvement of front/back Sound Localization Characteristics using Psychoacoustics of Head Related Transfer Function
Koo, Kyo-Sik ; Cha, Hyung-Tai ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 448~457
HRTF DB, including the information of the sounds which is arrived to our ears, is generally used to make a 3D sound. But it can decline some three-dimensional effects by the confusion between front and back directions due to the non-individual HRTF depending on each listener. In this paper, we propose a new method to use psychoacoustic theory that reduces the confusion of sound image localization. And we make use of an excitation energy by the sense of hearing. This method is brought HRTF spectrum characteristics into relief to draw out the energy ratio about the bark band. Informal listening tests show that the proposed method improves the front-back sound localization characteristics much better than the conventional methods.
Design and Implementation of Interactive Multi-view Visual Contents Authoring System
Lee, In-Jae ; Choi, Jin-Soo ; Ki, Myung-Seok ; Jeong, Se-Yoon ; Moon, Kyung-Ae ; Hong, Jin-Woo ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 458~470
This paper describes issues and consideration on authoring of interactive multi-view visual content based on MPEG-4. The issues include types of multi-view visual content; scene composition for rendering; functionalities for user-interaction; and multi-view visual content file format. The MPEG-4 standard, which aims to provide an object based audiovisual coding tool, has been developed to address the emerging needs from communications, interactive broadcasting as well as from mixed service models resulting from technological convergence. Due to the feature of object based coding, the use of MPEG-4 can resolve the format diversity problem of multi-view visual contents while providing high interactivity to users. Throughout this paper, we will present which issues need to be determined and how they can be realized by means of MPEG-4 Systems.
Generation of Multi-view Images Using Depth Map Decomposition and Edge Smoothing
Kim, Sung-Yeol ; Lee, Sang-Beom ; Kim, Yoo-Kyung ; Ho, Yo-Sung ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 471~482
In this paper, we propose a new scheme to generate multi-view images utilizing depth map decomposition and adaptive edge smoothing. After carrying out smooth filtering based on an adaptive window size to regions of edges in the depth map, we decompose the smoothed depth map into four types of images: regular mesh, object boundary, feature point, and number-of-layer images. Then, we generate 3-D scenes from the decomposed images using a 3-D mesh triangulation technique. Finally, we extract multi-view images from the reconstructed 3-D scenes by changing the position of a virtual camera in the 3-D space. Experimental results show that our scheme generates multi-view images successfully by minimizing a rubber-sheet problem using edge smoothing, and renders consecutive 3-D scenes in real time through information decomposition of depth maps. In addition, the proposed scheme can be used for 3-D applications that need the depth information, such as depth keying, since we can preserve the depth data unlike the previous unsymmetric filtering method.
Design and implementation of a three-dimensional broadcasting system based on DTV
Yun, Kug-Jin ; Cho, Suk-Hee ; Hur, Nam-Ho ; Kim, Jin-Woong ; Lee, Soo-In ; Ahn, Chi-Eteuk ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 483~494
In this paper, we propose a novel program specific information structure(PSI) in MPEG-2 system for a three-dimensional broadcasting system while guaranteeing compatibility with the conventional digital broadcasting system. The proposed PSI structure including a descriptor of contents type, 2D or 3D, provides service providers with a function of combining 2D and 3D contents freely. However the descriptor is ignored in the conventional digital broadcasting set-top box. With the proposed PSI structure, we designed and implemented a three-dimensional broadcasting system. The proposed system has 2D or 3D display mode for providing user's preference in a three-dimensional broadcasting environment.
Self-calibration of a Multi-camera System using Factorization Techniques for Realistic Contents Generation
Kim, Ki-Young ; Woo, Woon-Tack ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 495~506
In this paper, we propose a self-calibration of a multi-camera system using factorization techniques for realistic contents generation. The traditional self-calibration algorithms for multi-camera systems have been focused on stereo(-rig) camera systems or multiple camera systems with a fixed configuration. Thus, it is required to exploit them in 3D reconstruction with a mobile multi-camera system and another general applications. For those reasons, we suggest the robust algorithm for general structured multi-camera systems including the algorithm for a plane-structured multi-camera system. In our paper, we explain the theoretical background and practical usages based on a projective factorization and the proposed affine factorization. We show experimental results with simulated data and real images as well. The proposed algorithm can be used for a 3D reconstruction and a mobile Augmented Reality.
View Synthesis Using OpenGL for Multi-viewpoint 3D TV
Lee, Hyun-Jung ; Hur, Nam-Ho ; Seo, Yong-Duek ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 507~520
In this paper, we propose an application of OpenGL functions for novel view synthesis from multi-view images and depth maps. While image based rendering has been meant to generate synthetic images by processing the camera view with a graphic engine, little has been known about how to apply the given images and depth information to the graphic engine and render the scene. This paper presents an efficient way of constructing a 3D space with camera parameters, reconstructing the 3D scene with color and depth images, and synthesizing virtual views in real-time as well as their depth images.
Study on Improvement of DTV Signal Reception Performance Using New Mobile Channel Modelling and Estimation Algorithm
Lee, Chong-Hyun ; Kim, Kwang-Ho ; Kim, Kwang-Ho ; Cha, Jae-Sang ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 521~532
Recently, many research initiatives have been underway to improve reception performance of ATSC based DTV signal in mobile channel by adopting multiple antennas. In this paper, we propose a new mobile channel model which can be applicable to any array geometry. And then we propose new channel estimation algorithm which uses PN5l1 sequence in field synch. The proposed algorithm is to estimate channel by correlating the input signal in If frequency band and finding maximum peak, which does not need complicated synchronization circuit. Finally, we propose new receiver structures which can be implemented at the front-end of the existing receiver with no modification. With computer simulation, we verify the performance of the proposed model and verify the performance of the receiver structure with computer simulation.
Design and Realization of Stereo Vision Module For 3D Facial Expression Tracking
Lee, Mun-Hee ; Kim, Kyong-Sok ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 533~540
In this study we propose to use a facial motion capture technique to track facial motions and expressions effectively by using the stereo vision module, which has two CMOS IMAGE SENSORS. In the proposed tracking algorithm, a center point tracking technique and correlation tracking technique, based on neural networks, were used. Experimental results show that the two tracking techniques using stereo vision motion capture are able to track general face expressions at a 95.6% and 99.6% success rate, for 15 frames and 30 frames, respectively. However, the tracking success rates(82.7%,99.1%) of the center point tracking technique was far higher than those(78.7%,92.7%) of the correlation tracking technique, when lips trembled.
The Development of Terrestrial DMB System for Video Associated Data Services
Kim, Hyun-Soon ; Kyung, Il-Soo ; Kim, Sang-Hun ; Kim, Man-Sik ;
Journal of Broadcast Engineering, volume 11, issue 4, 2006, Pages 541~553
Since DMB on-air was started, not high-qualified audio, video services but various service models have been required. This paper is about systems for one of these services, video associated data service. A terrestrial DMB system to make contents of video associated data services and transmit them on DMB channel is proposed in this paper. This system satisfies standard of the video associated data services for terrestrial DMB; MPEG-4 BIFS (BInary Format for Scene) Core2D scene description profile and graphics profile. This system is designed to support two major features of broadcasting, real-time authoring non automatic transmission and non real-time authoring automatic transmission, and focuses on the abilities to make high-qualified contents efficiently and transmit them to video encoder reliably. This system proved its performance through conformance tests with various receivers, so can be used in future on-air.