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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 18, Issue 6 - Nov 2013
Volume 18, Issue 5 - Sep 2013
Volume 18, Issue 4 - Jul 2013
Volume 18, Issue 3 - May 2013
Volume 18, Issue 2 - Mar 2013
Volume 18, Issue 1 - Jan 2013
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Tolerance Analysis on 3-D Object Modeling Errors in Model-Based Camera Tracking
Rhee, Eun Joo ; Seo, Byung-Kuk ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 1~9
DOI : 10.5909/JBE.2013.18.1.1
Accuracy of the 3-D model is essential in model-based camera tracking. However, 3-D object modeling requires dedicated and complicated procedures for precise modeling without any errors. Even if a 3-D model contains a certain level of errors, on the other hand, the tracking errors cause by the modeling errors can be different from its perceptual errors; thus, it is an important aspect that the camera tracking can be successful without precise 3-D modeling if the modeling errors are within the user's permissible range. In this paper, we analyze the tolerance of 3-D object modeling errors by comparing computational matching errors with perceptual matching errors through user evaluations, and also discuss permissible ranges of 3-D object modeling errors.
New Adaptive Interpolation Based on Edge Direction extracted from the DCT Coefficient Distribution
Kim, Jaehun ; Kim, Kibaek ; Jeon, Gwanggil ; Jeong, Jechang ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 10~20
DOI : 10.5909/JBE.2013.18.1.10
Nowadays, video technology has been successfully improved creating tremendous results. As video technology improve, multimedia devices and demands from users are diversified. Therefore, a video codec used in these devices should support various displays with different resolutions. The technology to generate a higher resolution image from the associated low-resolution image is called interpolation. Interpolation is generally performed in either the spatial domain or the DCT domain. To use the advantages of both domains, we have proposed the new adaptive interpolation algorithm based on edge direction, which adaptively exploits the advantages of both domains. The experimental results demonstrate that our algorithm performs well in terms of PSNR and reduces the blocking artifacts.
Illuminant Color Estimation Method Using Valuable Pixels
Kim, Young-Woo ; Lee, Moon-Hyun ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 21~30
DOI : 10.5909/JBE.2013.18.1.21
It is a challenging problem to most of the image processing when the light source is unknown. The color of the light source must be estimated in order to compensate color changes. To estimate the color of the light source, additional assumption is need, so that we assumed color distribution according to the light source. If the pixels, which do not satisfy the assumption, are used, the estimation fails to provide an accurate result. The most popular color distribution assumption is Grey-World Assumption (GWA); it is the assumption that the color in each scene, the surface reflectance averages to gray or achromatic color over the entire images. In this paper, we analyze the characteristics of the camera response function, and the effect of the Grey-World Assumption on the pixel value and chromaticity, based on the inherent characteristics of the light source. Besides, we propose a novel method that detects important pixels for the color estimation of the light source. In our method, we firstly proposed a method that gives weights to pixels satisfying the assumption. Then, we proposed a pixel detection method, which we modified max-RGB method, to apply on the weighted pixels. Maximum weighted pixels in the column direction and row direction in one channel are detected. The performance of our method is verified through demonstrations in several real scenes. Proposed method better accurately estimate the color of the light than previous methods.
Development of Photogrammetric Rectification Method Applying Bayesian Approach for High Quality 3D Contents Production
Kim, Jae-In ; Kim, Taejung ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 31~42
DOI : 10.5909/JBE.2013.18.1.31
This paper proposes a photogrammetric rectification method based on Bayesian approach as a method that eliminates vertical parallax between stereo images to minimize visual fatigue of 3D contents. The image rectification consists of two phases; geometry estimation and epipolar transformation. For geometry estimation, coplanarity-based relative orientation algorithm was used in this paper. To ensure robustness for mismatch and localization error occurred by automation of tie point extraction, Bayesian approach was applied by introducing several prior constraints. As epipolar transformation perspective transformation was used based on condition of collinearity to minimize distortion of result images and modification for input images. Other algorithms were compared to evaluate performance. For geometry estimation, traditional relative orientation algorithm, 8-points algorithm and stereo calibration algorithm were employed. For epipolar transformation, Hartley algorithm and Bouguet algorithm were employed. The evaluation results showed that the proposed algorithm produced results with high accuracy, robustness about error sources and minimum image modification.
Effective Method to Change Multimedia Scene Configuration Information Using DOM Update
Kim, Kyuheon ; Park, JungWook ; Kim, Byungchul ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 43~58
DOI : 10.5909/JBE.2013.18.1.43
Richmedia Service means that interactive media service can provide view with various multimedia elements(such as Video, Audio, Text) at same time. Various Multimedia elements can be serviced by Scene Description technology standards like BIFS(Binary Format for Scenes) and LASeR(Light Application Scene Representation). By providing Scene Component information, richmedia service is available to various multimedia services. so users is available to personalized services fitting temporal and spatial options. In conventional technology, when the scene is changed by user or service, mobile deletes the scene of configuration information and makes new scene of configuration information. this is a very inefficient way. In this paper, Propoesed that by using DOM(Document Object Model) method, to pass only the dynamic configuration part, changes scene method.
Analysis on Co-channel Interference Coverage of ATSC DTV
Ryu, Kwanwoong ; Park, Sung Ik ; Kim, Heung Mook ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 59~65
DOI : 10.5909/JBE.2013.18.1.59
Recently, the digital television transition from analog television to digital television has been progressing in terrestrial broadcasting. As a result of the DTV transition, additional reassignments and deployments of TV White spaces (TVWS) caused by co-channel interference (CCI) were needed. In this paper, we investigate the TVWS caused by CCI using Longley-Rice and ITU-R P.1546 propagation model, which are the most widely-used propagation model. In addition, we analyze the service coverage radius and CCI radius according to the height of transmitter antenna and transmitting power. The results show that the ratios of CCI radius to service coverage radius in Longley-Rice and ITU-R P.1546 propagation model are about 2.54 and 2.07, respectively.
Screen Disparity and Size Perception Function of Various 3D Stimuli
Park, JongJin ; Li, Hyung-Chul O. ; Kim, ShinWoo ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 66~76
DOI : 10.5909/JBE.2013.18.1.66
Although there has been much advance in the development of 3D displays of various purpose, 3D contents are not yet so used as expected in those displays. One well-known obstacle in the enjoyment of 3D contents is visual fatigue, but another major issue is image distortion of 3D contents. In the previous research, Shin, Li, & Kim (2012) reported systematic linear relationship between screen disparity and size perception of a simple object whose retinal size was constant across different disparities. In this research, we intended to generalize the previous finding by using various 3D stimuli in the test of the relationship between screen disparity and size perception of those stimuli. Consistent with previous findings, our data indicated that size perception linearly changes as a function of screen disparity and the linearity was observed in all stimuli types we used in this research. We described the empirical relationship between screen disparity and size perception in the form of prediction function for size perception in which visual angle is the predictor. This function will be very useful in the creation of 3D contents as one can make reasonable predictions on the to-be-perceived size of an object being filmed using screen disparity of their camera setting.
Illumination Robust Feature Descriptor Based on Exact Order
Kim, Bongjoe ; Sohn, Kwanghoon ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 77~87
DOI : 10.5909/JBE.2013.18.1.77
In this paper, we present a novel method for local image descriptor called exact order based descriptor (EOD) which is robust to illumination changes and Gaussian noise. Exact orders of image patch is induced by changing discrete intensity value into k-dimensional continuous vector to resolve the ambiguity of ordering for same intensity pixel value. EOD is generated from overall distribution of exact orders in the patch. The proposed local descriptor is compared with several state-of-the-art descriptors over a number of images. Experimental results show that the proposed method outperforms many state-of-the-art descriptors in the presence of illumination changes, blur and viewpoint change. Also, the proposed method can be used for many computer vision applications such as face recognition, texture recognition and image analysis.
Personalized TV Program Recommendation in VOD Service Platform Using Collaborative Filtering
Han, Sunghee ; Oh, Yeonhee ; Kim, Hee Jung ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 88~97
DOI : 10.5909/JBE.2013.18.1.88
Collaborative filtering(CF) for the personalized recommendation is a successful and popular method in recommender systems. But the mainly researched and implemented cases focus on dealing with independent items with explicit feedback by users. For the domain of TV program recommendation in VOD service platform, we need to consider the unique characteristic and constraints of the domain. In this paper, we studied on the way to convert the viewing history of each TV program episodes to the TV program preference by considering the series structure of TV program. The former is implicit for personalized preference, but the latter tells quite explicitly about the persistent preference. Collaborative filtering is done by the unit of series while data gathering and final recommendation is done by the unit of episodes. As a result, we modified CF to make it more suitable for the domain of TV program VOD recommendation. Our experimental study shows that it is more precise in performance, yet more compact in calculation compared to the plain CF approaches. It can be combined with other existing CF techniques as an algorithm module.
Personalized Contents Recommendation System Based on Social Network
Lee, Seok-Pil ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 98~105
DOI : 10.5909/JBE.2013.18.1.98
Patterns for generating and consuming contents are various in these days from conventional broadcasting contents to UCC. There are many researches on developing recommendation engines based on user's profile for providing desired contents. In this paper we propose a contents recommendation system using not only user's profile but other's profiles in closed user group of the social network based on patterns for user's consuming contents. The proposed recommendation agent update user's profile using usage history and other's profiles related to the user in the closed user group.
A Performance Evaluation of the MPEG USAC with Variable Core-Band Down-Sampling Ratio
Lee, Jae Hwa ; Kim, Rin Chul ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 106~114
DOI : 10.5909/JBE.2013.18.1.106
This paper deals with the effect of the internal sampling frequency and core band down sampling ratio on the overall performance of the MPEG USAC. Here, the internal sampling frequency is the sampling frequency of a signal actually coded. The core band down sampling ratio is the ratio of the width of the core band over that of the coded band. The performance was measured on 6 different test sound sources by the MUSHRA test with 10 subjects. The experiments showed that 1/3 or 1/4 core band down sampling ratio could yield the better performance than the conventional 1/2 ratio, especially at low rates.
MPEG-DASH Services for 3D Contents Based on DMB AF
Kim, Yong Han ; Park, Minkyu ;
Journal of Broadcast Engineering, volume 18, issue 1, 2013, Pages 115~121
DOI : 10.5909/JBE.2013.18.1.115
Recently an extension to DMB AF (Digital Multimedia Broadcasting Application Format) standard has been proposed in such a way that the extended DMB AF can include stereoscopic video and stereoscopic images for interactive service data, i.e., MPEG-4 BIFS (Binary Format for Scene) data, in addition to the existing 2D video and 2D images for BIFS services. In this paper we developed a service that provides the streaming of 3D contents in DMB AF by using MPEG-DASH (Dynamic Adaptive Streaming over HTTP) standard and validated it by implementing the client software.