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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Broadcast Engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Broadcast and Media Engineers
Editor in Chief :
Volume & Issues
Volume 19, Issue 6 - Nov 2014
Volume 19, Issue 5 - Sep 2014
Volume 19, Issue 4 - Jul 2014
Volume 19, Issue 3 - May 2014
Volume 19, Issue 2 - Mar 2014
Volume 19, Issue 1 - Jan 2014
Selecting the target year
The Exploratory Study on the Impact of User's Characteristics and Use Behaviors on Personal Cloud Service Use
Kim, Dong-Woo ; Pyo, Si-Young ; Joung, Won-Jo ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 3~13
DOI : 10.5909/JBE.2014.19.1.3
This study as an exploratory study, investigates personal cloud service use which has been developed and distributed rapidly. Focusing on the user's characteristics and use behaviors, the influences of connected uses of platform and contents are empirically figured out. The results show that the contents which need small-data capacity like pictures and musics have been used very frequently in a cloud service. Second, 'platform-connected use' has been found out as the most influential factor in cloud service. SNS, e-mail, and personal innovativeness are also proved as significant factors. As a leading study analyzing theoretically the personal cloud service, it implies that it is necessary to consider the user's characteristics and use behaviors in developing cloud service in the market and making policy for promoting relevant industry.
A Study of Development for High-speed Cloud Video Service using SDN based Multi Radio Access Technology Control Methods
Kim, Dongha ; Lee, Sungwon ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 14~23
DOI : 10.5909/JBE.2014.19.1.14
This paper proposed controlling methods for SDN(Software Defined Network) based multiple radio access technology as the solutions of following two issues which were mainly occurred by explosive increasing of video traffic. The first one is a requirement for traffic off-loading caused by 3rd-party video service providers from the mobile network operator's viewpoint. The other one is a provision of high-speed video contents transmission services with low price. Furthermore, the performance evaluation was also conducted on the real test-bed which is composed of OpenStack cloud and SDN technology such as OpenFlow and Open vSwitch. A virtual machine running on the OpenStack provide a video service and the terminal which is able to use multiple radio access technology supports two 2.4GHz WLANs(Wireless Local Area Network) and three 5GHz WLANs, concurrently. Finally, we can get 820Mbps of the maximum transmission speed by using that five WLAN links for the single service at the same time.
Mobile Energy Efficiency Study using Cloud Computing in LTE
Jo, Bokyun ; Suh, Doug Young ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 24~30
DOI : 10.5909/JBE.2014.19.1.24
This study investigates computing offloading effect of cloud in real-time video personal broadcast service, whose server is mobile device. Mobile device does not have enough computing resource for encoding video. The computing burden is offloaded to cloud, which has abundant resources in terms of computing, power, and storage compared to mobile device. By reducing computing burden, computation energy can be saved while transmission data amount increases because of decreasing compression efficiency. This study shows that the optimal operation point can be found adaptively to time-varying LTE communication condition result of tradeoff analysis between offloaded computation burden and increase in amount of transmitted data.
Analysis of Relationship between Objective Performance Measurement and 3D Visual Discomfort in Depth Map Upsampling
Gil, Jong In ; Mahmoudpour, Saeed ; Kim, Manbae ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 31~43
DOI : 10.5909/JBE.2014.19.1.31
A depth map is an important component for stereoscopic image generation. Since the depth map acquired from a depth camera has a low resolution, upsamling a low-resolution depth map to a high-resolution one has been studied past decades. Upsampling methods are evaluated by objective evaluation tools such as PSNR, Sharpness Degree, Blur Metric. As well, the subjective quality is compared using virtual views generated by DIBR (depth image based rendering). However, works on the analysis of the relation between depth map upsampling and stereoscopic images are relatively few. In this paper, we investigate the relationship between subjective evaluation of stereoscopic images and objective performance of upsampling methods using cross correlation and linear regression. Experimental results demonstrate that the correlation of edge PSNR and visual fatigue is the highest and the blur metric has lowest correlation. Further, from the linear regression, we found relative weights of objective measurements. Further we introduce a formulae that can estimate 3D performance of conventional or new upsampling methods.
Influence of Depth Differences by Setting 3D Stereoscopic Convergence Point on Presence, Display Perception, and Negative Experiences
Lee, SangWook ; Chung, Donghun ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 44~55
DOI : 10.5909/JBE.2014.19.1.44
The goal of 3D stereoscopy is not only to maximize positive experiences (such as sense of realism) by adding depth information to 2D video but to also minimize negative experiences (such as fatigue). This study examines the impact of different depth levels induced by adjusting 3D camera convergences on positive and negative experiences and finds an optimal parameter for viewers. The results show that there are significant differences among depth levels on spatial involvement, realistic immersion, presence, depth perception, screen transmission, materiality, shape perception, spatial extension and display perception. There are also significant differences for fatigue and unnaturalness. This study suggests that reducing the camera convergence angle of an object by
behind the object is the optimal parameter in a 3D stereoscopic setting.
A Binarization Technique using Histogram Matching for License Plate with a Shadow
Kim, Jung Hun ; Kim, Gibak ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 56~63
DOI : 10.5909/JBE.2014.19.1.56
This paper deals with a binarization for plate number recognition. The binarization process converts an image into a binary image and plays an important role for automatically recognizing plate number. The rear license plate has often a shadowed image which causes erroneous binarized image due to non-uniform illumination. In this paper, a binarization method is proposed in which the shadow line is detected in a rear plate with a shadow. And then the histogram matching is conducted for the two image separated by the shadow line. After histogram matching, two images are joined and finally Otsu method is applied for the binarization. In the experiment, the proposed algorithm shows robust performance compared to the conventional method in the presence of estimation error in the shadow line.
Robust Primary-ambient Signal Decomposition Method using Principal Component Analysis with Phase Alignment
Baek, Yong-Hyun ; Hyun, Dong-Il ; Park, Young-Cheol ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 64~74
DOI : 10.5909/JBE.2014.19.1.64
The primary and ambient signal decomposition of a stereo sound is a key step to the stereo upmix. The principal component analysis (PCA) is one of the most widely used methods of primary-ambient signal decomposition. However, previous PCA-based decomposition algorithms assume that stereo sound sources are only amplitude-panned without any consideration of phase difference. So it occurs some performance degradation in case of live recorded stereo sound. In this paper, we propose a new PCA-based stereo decomposition algorithm that can consider the phase difference between the channel signals. The proposed algorithm overcomes limitation of conventional signal model using PCA with phase alignment. The phase alignment is realized by using inter-channel phase difference (IPD) which is widely used in parametric stereo coding. Moreover, Enhanced Modified PCA(EMPCA) is combined to solve the problem of conventional PCA caused by Primary to Ambient energy Ratio(PAR) and panning angle dependency. The simulation results are presented to show the improvements of the proposed algorithm.
Illumination Compensation Based on Conformity Assessment of Highlight Regions
Kwon, Oh-Seol ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 75~82
DOI : 10.5909/JBE.2014.19.1.75
This paper proposes an illuminant compensation method using a camera noise analysis without segmentation in the dichromatic reflectance model. In general, pixels within highlight regions include large amounts of information on the image illuminant. Thus, the analysis of highlight regions provides a relatively easy means of determining the characteristics of an image illuminant. Currently, conventional methods require regional segmentation and the accuracy of this segmentation then affects the illuminant estimation. Therefore, the proposed method estimates the illuminant without segmentation based on a conformity assessment of highlight regions. Furthermore, error factors, such as noise and sensor non-uniformity, can be reduced by the conformity assessment.
MPEG-U based Advanced User Interaction Interface System Using Hand Posture Recognition
Han, Gukhee ; Lee, Injae ; Choi, Haechul ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 83~95
DOI : 10.5909/JBE.2014.19.1.83
Hand posture recognition is an important technique to enable a natural and familiar interface in HCI(human computer interaction) field. In this paper, we introduce a hand posture recognition method by using a depth camera. Moreover, the hand posture recognition method is incorporated with MPEG-U based advanced user interaction (AUI) interface system, which can provide a natural interface with a variety of devices. The proposed method initially detects positions and lengths of all fingers opened and then it recognizes hand posture from pose of one or two hands and the number of fingers folded when user takes a gesture representing a pattern of AUI data format specified in the MPEG-U part 2. The AUI interface system represents user's hand posture as compliant MPEG-U schema structure. Experimental results show performance of the hand posture recognition and it is verified that the AUI interface system is compatible with the MPEG-U standard.
Histogram Equalization based on Differential Compression for Image Contrast Enhancement
Lee, Jae-Won ; Hong, Sung-Hoon ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 96~108
DOI : 10.5909/JBE.2014.19.1.96
In case of contrast of the image enhancement by using the conventional histogram equalization, over-enhancement, false contouring and distortion such as the details disappearance of the image occurs due to the excessive brightness change. Especially, these distortion appears when the brightness distribution is concentrated in a particular brightness level. In order to solve these problems, improved histogram equalization methods to transform the input histogram by clipping using threshold have been proposed, but contrast enhancement effect is reduced because it does not consider the characteristics of the input image's histogram to apply the same threshold for the entire histogram, and unnatural image is obtained because it does not retain the characteristics of the image. In this paper, to solve the problems of existing methods, we propose new equalization method that suppress excessive brightness changes by applying to the differential compression according to the histogram frequency, and maintain the characteristics of the input image. In addition, we propose a more effectively method to improve contrast by controlling the strength of the compression ratio depending on the characteristics of the input image.
Superresolution Restoration From Directional Rectangular Blurred Images
Shin, Jeongho ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 109~117
DOI : 10.5909/JBE.2014.19.1.109
This paper presents a superresolution restoration technique that can restore high-resolution images from differently blurred low resolution images rather than using the motion information between low-resolution images. In order to restore the super-resolution image the rotatable aperture mask lens system is proposed. The proposed technique does not need to estimate point spread function at each frame. In addition, it does not require image registration because there is no global translational motion between low resolution images. By using a rotatable rectangular aperture, two consecutive captured images provide sufficiently exclusive information for superresolution. Therefore, the proposed method can reduce the registration error between the low-resolution image as well as the calculation amount for superresolution restoration. The existing lens system of the camera can be extended to obtain a superresolution image by only adding an rotatable rectangular aperture mask. Finally, in order to verify the performance of the proposed system, experimental results are performed. By comparing with the existing superresolution methods, the proposed method showed the significant improvements in the sense of spatial resolution.
Fast Multiple Mixed Image Interpolation Method for Image Resolution Enhancement
Kim, Won-Hee ; Kim, Jong-Nam ; Jeong, Shin-Il ;
Journal of Broadcast Engineering, volume 19, issue 1, 2014, Pages 118~121
DOI : 10.5909/JBE.2014.19.1.118
Image interpolation is a method of determining the value of new pixel coordinate in the process of image scaling. Recently, image contents are likely to be a large-capacity, interpolation algorithm is required to generate fast enhanced result image. In this paper, fast multiple mixed image interpolation for image resolution enhancement is proposed. The proposed method estimates expected 12 shortfalls from four sub-images of a input image, and generates the result image that is interpolated in the combination of the expected shortfalls with the input image. The experimental results demonstrate that PSNR increases maximum value of 1.9dB, SSIM increases maximum value of 0.052, and the subjective quality is superior to any other compared methods. Moreover, it is known by algorithm running time comparison that the proposed method has been at least three times faster than the compared conventional methods. The proposed method can be useful for application on image resolution enhancement.