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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
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Realtime No-Reference Quality-Assessment Over Packet Video Networks
Sung, Duk-Gu ; Kim, Yo-Han ; Hana, Jung-Hyun ; Shin, Ji-Tae ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 387~396
DOI : 10.5909/JBE.2009.14.4.387
No-Reference video-quality assessments are divided into two kinds of metrics based on decoding pixel domain or the bitstream one. Traditional full-/reduced- reference methods have difficulty to be deployed as realtime video transmission because it has problems of additional data, complexity, and assessment accuracy. This paper presents simple and highly accurate no-reference video-quality assessment in realtime video transmission. Our proposed method uses quantization parameter, motion vector, and information of transmission error. To evaluate performance of the proposed algorithm, we perform subjective test of video quality with the ITU-T P.910 Absolute Category Rating(ACR) method and compare our proposed algorithm with the subjective quality assessment method. Experimental results show the proposed quality metric has a high correlation (85%) in terms of subjective quality assessment.
Retrieval of Identical Clothing Images Based on Non-Static Color Histogram Analysis
Choi, Yoo-Joo ; Moon, Nam-Mee ; Kim, Ku-Jin ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 397~408
DOI : 10.5909/JBE.2009.14.4.397
In this paper, we present a non-static color histogram method to retrieve clothing images that are similar to a query clothing. Given clothing area, our method automatically extracts major colors by using the octree-based quantization approach. Then, a color palette that is composed of the major colors is generated. The feature of each clothing, which can be either a query or a database clothing image, is represented as a color histogram based on its color palette. We define the match color bins between two possibly different color palettes, and unify the color palettes by merging or deleting some color bins if necessary. The similarity between two histograms is measured by using the weighted Euclidean distance between the match color bins, where the weight is derived from the frequency of each bin. We compare our method with previous histogram matching methods through experiments. Compared to HSV cumulative histogram-based approach, our method improves the retrieval precision by 13.7 % with less number of color bins.
A Method of Pedestrian Flow Speed Estimation Adaptive to Viewpoint Changes
Lee, Gwang-Gook ; Yoon, Ja-Young ; Kim, Jae-Jun ; Kim, Whoi-Yul ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 409~418
DOI : 10.5909/JBE.2009.14.4.409
This paper proposes a method to estimate the flow speed of pedestrians in surveillance videos. In the proposed method, the average moving speed of pedestrians is measured by estimating the size of real-world motion from the observed motion vectors. For this purpose, a pixel-to-meter conversion factor is introduced which is calculated from camera parameters. Also, the height information, which is missing because of camera projection, is predicted statistically from simulation experiments. Compared to the previous works for flow speed estimation, our method can be applied to various camera views because it separates scene parameters explicitly. Experiments are performed on both simulation image sequences and real video. In the experiments on simulation videos, the proposed method estimated the flow speed with average error of about 0.08m/s. The proposed method also showed promising results for the real video.
Autostereoscopic 3D display system with moving parallax barrier and eye-tracking
Chae, Ho-Byung ; Ryu, Young-Roc ; Lee, Gang-Sung ; Lee, Seung-Hyun ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 419~427
DOI : 10.5909/JBE.2009.14.4.419
We present a novel head tracking system for stereoscopic displays that ensures the viewer has a high degree of movement. The tracker is capable of segmenting the viewer from background objects using their relative distance. A depth camera using TOF(Time-Of-Flight) is used to generate a key signal for eye tracking application. A method of the moving parallax barrier is also introduced to supplement a disadvantage of the fixed parallax barrier that provides observation at the specific locations.
An Adaptive Tone Reproduction for High Dynamic Range Image
Lee, Joo-Hyun ; Jeon, Gwang-Gil ; Jeon, Je-Chang ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 428~437
DOI : 10.5909/JBE.2009.14.4.428
A high dynamic range (HDR) image can represent real world scenes that have a wide range of luminance intensity. However, compared with the range of real world luminance, conventional display devices have a low dynamic range (LDR). To display HDR images onto conventional displayable devices such as monitors and printers, we propose the logarithmic based global reproduction algorithm that considers the features of the image using reproduction parameters. Based on the characteristics of the image, we first modify the input luminance values for reproducing perceptually tuned images and then obtain the displayable output values directly. The experimental results show that the proposed algorithm achieves good subjective results while preserving details of the image; furthermore, the proposed algorithm has a fast, simple and practical structure for implementation.
Channel and Data Analysis System for Digital TV Broadcasting Using Modified Hilbert Transform
Suh, Young-Woo ; Lee, Jae-Kwon ; Mok, Ha-Kyun ; Choi, Jin-Yong ; Seo, Jong-Soo ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 438~449
DOI : 10.5909/JBE.2009.14.4.438
To analyze reception environments of ATSC Digital TV, CIR (Channel Impulse Response) analysis systems are widely applied. The receiving performances of conventional CIR analysis systems are not as good as those of commercial state-of-the-art receivers. There are difficulties in measuring and analyzing reception problems caused by multi-path interferences. To solve these problems, commercial DTV chip sets embedded CIR analysis system is proposed. Generally, commercial chip sets provide baseband (In-phase) channel data and field or segment sync data. For more precise analysis of measured I channel data, it is necessary to extract Q (quadrature) channel data components as well. This paper presents the technical requirements of CIR analysis system for DTV. In order to satisfy such requirements and measure more accurate magnitude and phase of CIR, a method to derive the quadrature data from the measured in-phase channel data is proposed. The proposed channel analysis system is implemented with a commercial DTV chip set and expedites the data analysis for use on DTV field test vehicles. Computer simulation and laboratory test results are provided to demonstrate the performance of the proposed channel analysis system.
Bilayer Segmentation of Consistent Scene Images by Propagation of Multi-level Cues with Adaptive Confidence
Lee, Soo-Chahn ; Yun, Il-Dong ; Lee, Sang-Uk ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 450~462
DOI : 10.5909/JBE.2009.14.4.450
So far, many methods for segmenting single images or video have been proposed, but few methods have dealt with multiple images with analogous content. These images, which we term consistent scene images, include concurrent images of a scene and gathered images of a similar foreground, and may be collectively utilized to describe a scene or as input images for multi-view stereo. In this paper, we present a method to segment these images with minimum user input, specifically, manual segmentation of one image, by iteratively propagating information via multi-level cues with adaptive confidence depending on the nature of the images. Propagated cues are used as the bases to compute multi-level potentials in an MRF framework, and segmentation is done by energy minimization. Both cues and potentials are classified as low-, mid-, and high- levels based on whether they pertain to pixels, patches, and shapes. A major aspect of our approach is utilizing mid-level cues to compute low- and mid- level potentials, and high-level cues to compute low-, mid-, and high- level potentials, thereby making use of inherent information. Through this process, the proposed method attempts to maximize the amount of both extracted and utilized information in order to maximize the consistency of the segmentation. We demonstrate the effectiveness of the proposed method on several sets of consistent scene images and provide a comparison with results based only on mid-level cues .
XML-based Single Sign-On Scheme for Internet Protocol TV(IPTV)Services
Lee, Seung-Hun ; Shin, Dong-Il ; Shin, Dong-Kyoo ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 463~474
DOI : 10.5909/JBE.2009.14.4.463
By employing the subscriber concept in broadcasting services, IPTV (Internet Protocol Television) operators provide various grades of services to subscribers based on the billing level of the subscribers. With the income from subscribers for a basis, IPTV operators plan to provide high quality services. Since Web browser-based IPTV provides T-commerce and E-commerce services as well as television services, users may frequently visit other service domains to buy goods or content. To provide the user with charged or private services, these service domains request authentication of user. The existing authentication system is not appropriate for the IPTV service environment because the environment unavoidably forces the user to cross from one authentication-based service domain to another. Single sign-on provides a user with transparent authentication services by enabling an authenticated user to move between authentication-based service domains without any re-authentication. Like this distributed environment, since the IPTV service environment also provides a variety of authentication-based services, transparent authentication service needs to be provided to subscribers who want to access charged or private services. In this paper, we propose a new user authentication scheme for the IPTV environment. This scheme integrates the Security Assertion Markup Language (SAML), which is a standard for XML-based single sign on. We validate this scheme using a simple use case scenario.
Edge-Based Tracking of an LED Traffic Light for a Road-to-Vehicle Visible Light Communication System
Premachandra, H. Chinthaka N. ; Yendo, Tomohiro ; Tehrani, Mehrdad Panahpour ; Yamazato, Takaya ; Fujii, Toshiaki ; Tanimoto, Masayuki ; Kimura, Yoshikatsu ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 475~487
DOI : 10.5909/JBE.2009.14.4.475
We propose a visible light road-to-vehicle communication system at intersection as one of ITS technique. In this system, the communication between vehicle and a LED traffic light is approached using LED traffic light as a transmitter, and on-vehicle high-speed camera as a receiver. The LEDs in the transmitter are emitted in 500Hz and those emitting LEDs are captured by a high-speed camera for making communication. Here, the luminance value of each LED in the transmitter should be found for consecutive frames to achieve effective communication. For this purpose, first the transmitter should be identified, then it should be tracked for consecutive frames while the vehicle is moving, by processing the images from the high-speed camera. In our previous work, the transmitter was identified by getting the subtraction of two consecutive frames. In this paper, we mainly introduce an algorithm to track the identified transmitter in consecutive frames. Experimental results using appropriate images showed the effectiveness of the proposal.
A Study on Multimedia Application Service using DTV Closed Caption Data
Kim, Jung-Youn ; Nam, Je-Ho ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 488~500
DOI : 10.5909/JBE.2009.14.4.488
In this paper, we study on making a use of value-added services using DTV closed caption data. Note that Closed-Captioning service helps to bridge "digital divide" through extending broadcasting accessibility of a neglected class such as hearing-impaired person and foreigner. In Korea, DTV Closed Captioning standard was developed in June 2007, and Closed Captioning service should be provided by an enforcing law in all broadcasting services in April 2008. Here, we describe the method of extracting a caption data from MPEG-2 Transport Stream of ATSC-based digital TV signal and generating a caption file using the extracted caption data and time information. In addition, we present the segmentation method of broadcasting content using caption file. Experimental results show that implemented S/W tool provides the feasibility of the proposed methods and the usability of closed caption for a variety of data application service.
Efficient Transform-Domain Noise Reduction for H.264 Video Encoding
Song, Byung-Cheol ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 501~508
DOI : 10.5909/JBE.2009.14.4.501
This paper proposes an efficient transform-domain noise reduction scheme in an H.264 video encoder, where the generalized Wiener filtering is performed in a quantization process by multiplying each transform block with its adaptive multiplication factor. In practice, the computational complexity of the proposed scheme is negligible by replacing the multiplication operation with a simple look-up table method. Also, experimental results show that the proposed scheme provides outstanding noise reduction performance in an H.264 video encoder.
Study on the Performance of Hierarchical Modulation for AT-DMB System
Lee, Sang-Jin ; Lee, Sang-Woon ; Yang, Kyu-Tae ; Lim, Jong-Soo ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 509~517
DOI : 10.5909/JBE.2009.14.4.509
This paper introduces an Advanced Terrestrial DMB (AT-DMB) system which provides higher efficiency of transmission and better quality of service than conventional T-DMB system. In AT-DMB, a hierarchical modulation method is applied to transmit more data while maintaining backward compatibility to conventional T-DMB receivers. This method can provide not only high quality video service but also lots of broadcasting channels. In this paper, the performance of the hierarchical modulation in AT-DMB system is analyzed with computer simulation in several environments compared with the performance of T-DMB system.
Implementation & Test Results analysis Of a DTV Distributed Translator(DTxR) Network
Mok, Ha-Kyun ; Wang, Soo-Hyun ; Sung, Young-Mo ; Lee, Yong-Tae ; Lee, Yong-Hoon ; Kim, Heung-Mook ;
Journal of Broadcast Engineering, volume 14, issue 4, 2009, Pages 518~536
DOI : 10.5909/JBE.2009.14.4.518
To verify the performance of a Distributed Translator Network(DTxR) system in the real world conditions, 5 legacy DTV broadcasting repeater sites were implemented with 5 DTxR systems and field-tested by the DTV field test truck. The 4 DTV broadcasting repeater sites are selected in congested areas where their service areas are overlapped and the 5th site is deviated from the other sites to examine the effect of long-delayed multipath signals. First of all, we checked the receiving signal of the main station that used as a transmitting signal in 5 DTxR systems on the pre-selected 60 test points and tested every case of a DTxR system`s on & off except 1 repeater site due to the already built-in DTV repeater system. The test items are received signal electric field strength, noise margin, ease of reception and subjective evaluation of the picture quality for received signals. We used 3rd, 5th, and 6th generation DTV receivers to examine the differences of the receivability by each generation of DTV receivers. Reviewing the test results, we conclude that the DTxR system can be adopted in the current DTV Repeater sites and it could improve the quality and receivability of the main signals by extending the service areas and enhancing the signal levels in the shadow areas without using the extra broadcasting channels.