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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 21, Issue 4 - Jul 2016
Volume 21, Issue 3 - May 2016
Volume 21, Issue 2 - Mar 2016
Volume 21, Issue 1 - Jan 2016
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A Comparison of 3D Reconstruction through the Passive and Pseudo-Active Acquisition of Images
Jeona, MiJeong ; Kim, DuBeom ; Chai, YoungHo ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 3~10
DOI : 10.5909/JBE.2016.21.1.3
In this paper, two reconstructed point cloud sets with the information of 3D features are analyzed. For a certain 3D reconstruction of the interior of a building, the first image set is taken from the sequential passive camera movement along the regular grid path and the second set is from the application of the laser scanning process. Matched key points over all images are obtained by the SIFT(Scale Invariant Feature Transformation) algorithm and are used for the registration of the point cloud data. The obtained results are point cloud number, average density of point cloud and the generating time for point cloud. Experimental results show the necessity of images from the additional sensors as well as the images from the camera for the more accurate 3D reconstruction of the interior of a building.
Human-Object Interaction Framework Using RGB-D Camera
Baeka, Yong-Hwan ; Lim, Changmin ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 11~23
DOI : 10.5909/JBE.2016.21.1.11
Recent days, touch interaction interface is the most widely used interaction interface to communicate with digital devices. Because of its usability, touch technology is applied almost everywhere from watch to advertising boards and it is growing much bigger. However, this technology has a critical weakness. Normally, touch input device needs a contact surface with touch sensors embedded in it. Thus, touch interaction through general objects like books or documents are still unavailable. In this paper, a human-object interaction framework based on RGB-D camera is proposed to overcome those limitation. The proposed framework can deal with occluded situations like hovering the hand on top of the object and also moving objects by hand. In such situations object recognition algorithm and hand gesture algorithm may fail to recognize. However, our framework makes it possible to handle complicated circumstances without performance loss. The framework calculates the status of the object with fast and robust object recognition algorithm to determine whether it is an object or a human hand. Then, the hand gesture recognition algorithm controls the context of each object by gestures almost simultaneously.
Hierarchical Subdivision of Light Distribution Model for Realistic Shadow Generation in Augmented Reality
Kim, Iksu ; Eem, Changkyoung ; Hong, Hyunki ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 24~35
DOI : 10.5909/JBE.2016.21.1.24
By estimating environment light distribution, we can generate realistic shadow images in AR(augmented reality). When we estimate light distribution without sensing equipment, environment light model, geometry of virtual object, and surface reflection property are needed. Previous study using 3D marker builds surrounding light environment with a geodesic dome model and analyzes shadow images. Because this method employs candidate shadow maps in initial scene setup, however, it is difficult to estimate precise light information. This paper presents a novel light estimation method based on hierarchical light distribution model subdivision. By using an overlapping area ratio of the segmented shadow and candidate shadow map, we can make hierarchical subdivision of light geodesic dome.
Robust Semi-auto Calibration Method for Various Cameras and Illumination Changes
Shin, Dong-Won ; Ho, Yo-Sung ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 36~42
DOI : 10.5909/JBE.2016.21.1.36
Recently, many 3D contents have been produced through the multiview camera system. In this system, since a difference of the viewpoint between color and depth cameras is inevitable, the camera parameter plays the important role to adjust the viewpoint as a preprocessing step. The conventional camera calibration method is inconvenient to users since we need to choose pattern features manually after capturing a planar chessboard with various poses. Therefore, we propose a semi-auto camera calibration method using a circular sampling and an homography estimation. Firstly, The proposed method extracts the candidates of the pattern features from the images by FAST corner detector. Next, we reduce the amount of the candidates by the circular sampling and obtain the complete point cloud by the homography estimation. Lastly, we compute the accurate position having the sub-pixel accuracy of the pattern features by the approximation of the hyper parabola surface. We investigated which factor affects the result of the pattern feature detection at each step. Compared to the conventional method, we found the proposed method released the inconvenience of the manual operation but maintained the accuracy of the camera parameters.
Distortion Calibration and FOV Adjustment in Video See-through AR using Mobile Phones
Widjojo, Elisabeth Adelia ; Hwang, Jae-In ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 43~50
DOI : 10.5909/JBE.2016.21.1.43
In this paper, we present a distortion correction for wearable Augmented Reality (AR) on mobile phones. Head Mounted Display (HMD) using mobile phones, such as Samsung Gear VR or Google's cardboard, introduces lens distortion of the rendered image to user. Especially, in case of AR the distortion is more complicated due to the duplicated optical systems from mobile phone's camera and HMD's lens. Furthermore, such distortions generate mismatches of the visual cognition or perception of the user. In a natural way, we can assume that transparent wearable displays are the ultimate visual system which generates the least misperception. Therefore, the image from the mobile phone must be corrected to cancel this distortion to make transparent-like AR display with mobile phone based HMD. We developed a transparent-like display in the mobile wearable AR environment focusing on two issues: pincushion distortion and field-of view. We implemented our technique and evaluated their performance.
Face Recognition using High-order Local Pattern Descriptor and DCT-based Illuminant Compensation
Choi, Sung-Woo ; Kwon, Oh-Seol ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 51~59
DOI : 10.5909/JBE.2016.21.1.51
This paper presents a method of DCT-based illuminant compensation to enhance the accuracy of face recognition under an illuminant change. The basis of the proposed method is that the illuminant is generally located in low-frequency components in the DCT domain. Therefore, the effect of the illuminant can be compensated by controlling the low-frequency components. Moreover, a directional high-order local pattern descriptor is used to detect robust features in the case of face motion. Experiments confirm the performance of the proposed algorithm got up to 95% when tested using a real database.
An Efficient Method to Compute a Covariance Matrix of the Non-local Means Algorithm for Image Denoising with the Principal Component Analysis
Kim, Jeonghwan ; Jeong, Jechang ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 60~65
DOI : 10.5909/JBE.2016.21.1.60
This paper introduces the non-local means (NLM) algorithm for image denoising, and also introduces an improved algorithm which is based on the principal component analysis (PCA). To do the PCA, a covariance matrix of a given image should be evaluated first. If we let the size of neighborhood patches of the NLM S × S
, and let the number of pixels Q, a matrix multiplication of the size S
× Q is required to compute a covariance matrix. According to the characteristic of images, such computation is inefficient. Therefore, this paper proposes an efficient method to compute the covariance matrix by sampling the pixels. After sampling, the covariance matrix can be computed with matrices of the size S
× floor (Width/l) × (Height/l).
Crosstalk Reduction of Glasses-free 3D Displays using Multiview Image Processing
Kim, Sung-Yeol ; Lee, Jin-Sung ; Choi, Sang Mi ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 66~75
DOI : 10.5909/JBE.2016.21.1.66
In this paper, we present a new method to reduce crosstalk of a glasses-free three-dimensional (3D) display using a multi-view image processing technique. Since crosstalk makes the current view image mixed with its neighboring ones, the output 3D image becomes severely blurred. We apply adaptive depth retargeting and view gradient-based crosstalk inverse filtering onto a multi-view image to minimize crosstalk of the glasses-free 3D display. In addition, overflow and underflow pixels are compensated by epipolar image pixel interpolation so that visual artifacts are minimized. Experimental results show that the proposed method reduces crosstalk more efficiently than the previous work while improving 3D image quality.
Stereoscopic Depth from 3D Contents with Various Disparity
Kham, Keetaek ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 76~86
DOI : 10.5909/JBE.2016.21.1.76
This study was investigated whether the perceived depth was changed depending on the measurement methods. In the method of direct comparison, virtual object with one of the various binocular disparities was presented in the frontal space with LEDs which were used for depth estimation for a binocular stimulus, while in the method of indirect comparison, visual object was presented in the frontal space but the LEDs were placed rightward at the angle of 45 degree from the mid-sagittal line. In these experimental setup, the depth of binocular stimulus was directly matched that of LED in direct comparison condition. In indirect comparison condition, however, observer estimated the depth of binocular stimulus, turned one's head rightward to the array of LEDs and turned on the LED which was supposed to be the same depth as binocular stimulus. Additionally, it was investigated whether the perceived depth was different depending on observer's stereo acuity. The results showed that perceived depths measured in the direct comparison were more similar to the depth predicted from geometry than those in the indirect comparison, and that the perceived depths from observers with high stereo acuity were similar to the predicted depth from geometry those from observers with low stereo acuity. These results indicated that stereoscopic depths of the binocular stimuli would vivid and compelling when binocular stimuli was simultaneously presented with real objects in the same visual space, like a mixed reality.
Recognition of Symbolic Road Marking using HOG-SP and Improved Lane Detection
Lee, Myungwoo ; Kwak, Sooyeong ; Byun, Hyeran ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 87~96
DOI : 10.5909/JBE.2016.21.1.87
Recently, there is a need for automatic recognition of a variety of symbols on roads because of activation of information services using digital maps on the Web or mobile devices. This paper proposes a method which automatically recognizes 11 kinds of symbolic road markings on the road surface with HOG-SP(Histogram of oriented Gradients-Split Projection) descriptor and shows improvement of lane position detection with recognized symbolic road markings. With the proposed method, recognition rate of 81.99% has been proven on NAVER road view images and the experiments proves the superiority of proposed method by comparisons with other existing methods. Moreover, this paper shows 7.64% higher lane position detection rate by recognizing road surface marking beforehand than only detecting lanes' positions.
Improvement of Fringe Area using ICS Extremely Low Power Repeater
Choi, Soo-cheol ; Cho, Ki-ryang ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 97~104
DOI : 10.5909/JBE.2016.21.1.97
In this paper, in order to relieve the area of terrestrial DTV broadcasting, we watch the same channel DTV Repeater output ICS using nano field test and analysis of effect was proven. Interspersed throughout the blanket area(natural) and buildings(artificially) 7 established the field selected as the test area, and each station(KBS1, KBS2, MBC, SBS, EBS) Extremely Low Power ICS Repeater the same channel of the receiving field strength and after install, SNR(Signal to Noise Ratios) verify the equipment to measure the efficacy and minimal output for future ICS type nav should you wish to provide a research-based for the spread.
Relay Selection for Two-hop Cooperative Jamming Network with Multiple Eavesdroppers
Choi, Yongyun ; Lee, Jae Hong ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 105~108
DOI : 10.5909/JBE.2016.21.1.105
In this paper, a cooperative jamming network with multiple relays and multiple eavesdroppers is investigated. Among the relays, one best relay is selected to amplify and forward the signal to destination through two phases. To confuse eavesdroppers, the destination transmits a jamming signal in the first phase and the source transmits jamming signal in the second phase. Secrecy rate of this system is derived, and based on the available channel state information (CSI), relay selection schemes are proposed, respectively. Numerical results show that the performance of the proposed relay selection scheme outperforms than that of random relay selection scheme.
Outage Probability Analysis for a Two-Way Relay Network with User Selection in the Presence of Interference
Kwon, Younghoon ; Im, Gyeongrae ; Lee, Jae Hong ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 109~112
DOI : 10.5909/JBE.2016.21.1.109
This paper analyzes the outage performance of a two-way relay network in the presence of interference from multiple interferers. We investigate a two-way relay network where a single user communicates with a selected other user via a relay during three phases. We propose a user selection scheme and analyze an outage probability. Numerical results verify our analysis by comparison with computer simulation and show effects of the number of users and the number of interferers on its the outage probability.
Performance Analysis of Multiple Access for Secondary Users in The Spectrum Sensing Cognitive Radio
Hong, Seung Geun ; Lee, Jae Hong ;
Journal of Broadcast Engineering, volume 21, issue 1, 2016, Pages 113~116
DOI : 10.5909/JBE.2016.21.1.113
Cognitive radio network technology is that secondary (unlicensed) users use the spectrum of primary (licensed) users without interfering primary communication. In this paper, we propose multiple access scheme for a cognitive radio network, where multiple secondary users access spectrum of one primary user. We consider two types of multiple access scheme, one is p-persistent and one is non-persistent, and apply these two schemes in the secondary network. For each multiple access scheme, total throughput of secondary network is derived and verified by Monte Carlo simulation. Simulation results show that maximum total throughput of the secondary network is achieved when channel access probability or the number of maximum waiting frames is chosen appropriately.