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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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Adaptive Extended Bilateral Motion Estimation Considering Block Type and Frame Motion Activity
Park, Daejun ; Jeong, Jechang ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 342~348
DOI : 10.5909/JBE.2013.18.3.342
In this paper, a novel frame rate up conversion (FRUC) algorithm using adaptive extended bilateral motion estimation (AEBME) is proposed. Conventionally, extended bilateral motion estimation (EBME) conducts dual motion estimation (ME) processes on the same region, therefore involves high complexity. However, in this proposed scheme, a novel block type matching procedure is suggested to accelerate the ME procedure. We calculate the edge information using sobel mask, and the calculated edge information is used in block type matching procedure. Based on the block type matching, decision will be made whether to use EBME. Motion vector smoothing (MVS) is adopted to detect outliers and correct outliers in the motion vector field. Finally, overlapped block motion compensation (OBMC) and motion compensated frame interpolation (MCFI) are adopted to interpolate the intermediate frame in which OBMC is employed adaptively based on frame motion activity. Experimental results show that this proposed algorithm has outstanding performance and fast computation comparing with EBME.
Template-Matching-based High-Speed Face Tracking Method using Depth Information
Kim, Wooyoul ; Seo, Youngho ; Kim, Dongwook ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 349~361
DOI : 10.5909/JBE.2013.18.3.349
This paper proposes a fast face tracking method with only depth information. It is basically a template matching method, but it uses a early termination scheme and a sparse search scheme to reduce the execution time to solve the problem of a template matching method, large execution time. Also a refinement process with the neighboring pixels is incorporated to alleviate the tracking error. The depth change of the face being tracked is compensated by predicting the depth of the face and resizing the template. Also the search area is adjusted on the basis of the resized template. With home-made test sequences, the parameters to be used in face tracking are determined empirically. Then the proposed algorithm and the extracted parameters are applied to the other home-made test sequences and a MPEG multi-view test sequence. The experimental results showed that the average tracking error and the execution time for the home-made sequences by Kinect (
) were about 3% and 2.45ms, while the MPEG test sequence (
) showed about 1% of tracking error and 7.46ms of execution time.
Real-Time Augmented Reality on 3-D Mobile Display using Stereo Camera Tracking
Park, Jungsik ; Seo, Byung-Kuk ; Park, Jong-Il ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 362~371
DOI : 10.5909/JBE.2013.18.3.362
This paper presents a framework of real-time augmented reality on 3-D mobile display with stereo camera tracking. In the framework, camera poses are jointly estimated with the geometric relationship between stereoscopic images, which is based on model-based tracking. With the estimated camera poses, the virtual contents are correctly augmented on stereoscopic images through image rectification. For real-time performance, stereo camera tracking and image rectification are efficiently performed using multiple threads. Image rectification and color conversion are accelerated with a GPU processing. The proposed framework is tested and demonstrated on a commercial smartphone, which is equipped with a stereoscopic camera and a parallax barrier 3-D display.
Content-based Image Retrieval using LBP and HSV Color Histogram
Lee, Kwon ; Lee, Chulhee ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 372~379
DOI : 10.5909/JBE.2013.18.3.372
In this paper, we proposed a content-based image retrieval algorithm using local binary patterns and HSV color histogram. Images are retrieved using image input in image retrieval system. Many researches are based on global feature distribution such as color, texture and shape. These techniques decrease the retrieval performance in images which contained background the large amount of image. To overcome this drawback, the proposed method extract background fast and emphasize the feature of object by shrinking the background. The proposed method uses HSV color histogram and Local Binary Patterns. We also extract the Local Binary Patterns in quantized Hue domain. Experimental results show that the proposed method 82% precision using Corel 1000 database.
Golf Swing Classification Using Fuzzy System
Park, Junwook ; Kwak, Sooyeong ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 380~392
DOI : 10.5909/JBE.2013.18.3.380
A method to classify a golf swing motion into 7 sections using a Kinect sensor and a fuzzy system is proposed. The inputs to the fuzzy logic are the positions of golf club and its head, which are extracted from the information of golfer's joint position and color information obtained by a Kinect sensor. The proposed method consists of three modules: one for extracting the joint's information, another for detecting and tracking of a golf club, and the other for classifying golf swing motions. The first module extracts the hand's position among the joint information provided by a Kinect sensor. The second module detects the golf club as well as its head with the Hough line transform based on the hand's coordinate. Using a fuzzy logic as a classification engine reduces recognition errors and, consequently, improves the performance of robust classification. From the experiments of real-time video clips, the proposed method shows the reliability of classification by 85.2%.
A Study on Hand Region Detection for Kinect-Based Hand Shape Recognition
Park, Hanhoon ; Choi, Junyeong ; Park, Jong-Il ; Moon, Kwang-Seok ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 393~400
DOI : 10.5909/JBE.2013.18.3.393
Hand shape recognition is a fundamental technique for implementing natural human-computer interaction. In this paper, we discuss a method for effectively detecting a hand region in Kinect-based hand shape recognition. Since Kinect is a camera that can capture color images and infrared images (or depth images) together, both images can be exploited for the process of detecting a hand region. That is, a hand region can be detected by finding pixels having skin colors or by finding pixels having a specific depth. Therefore, after analyzing the performance of each, we need a method of properly combining both to clearly extract the silhouette of hand region. This is because the hand shape recognition rate depends on the fineness of detected silhouette. Finally, through comparison of hand shape recognition rates resulted from different hand region detection methods in general environments, we propose a high-performance hand region detection method.
Classification based Knee Bone Detection using Context Information
Shin, Seungyeon ; Park, Sanghyun ; Yun, Il Dong ; Lee, Sang Uk ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 401~408
DOI : 10.5909/JBE.2013.18.3.401
In this paper, we propose a method that automatically detects organs having similar appearances in medical images by learning both context and appearance features. Since only the appearance feature is used to learn the classifier in most existing detection methods, detection errors occur when the medical images include multiple organs having similar appearances. In the proposed method, based on the probabilities acquired by the appearance-based classifier, new classifier containing the context feature is created by iteratively learning the characteristics of probability distribution around the interest voxel. Furthermore, both the efficiency and the accuracy are improved through 'region based voting scheme' in test stage. To evaluate the performance of the proposed method, we detect femur and tibia which have similar appearance from SKI10 knee joint dataset. The proposed method outperformed the detection method only using appearance feature in aspect of overall detection performance.
Presentation Method Using Depth Information
Kim, Ho-Seung ; Kwon, Soon-Kak ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 409~415
DOI : 10.5909/JBE.2013.18.3.409
Recently, various equipments have been developed for convenience of presentations. Presentation equipments added the keyboard and mouse functions to laser pointer and devices have become main method. However these devices have demerits of limited action and a few events. In this paper, we propose a method which increases the degrees of freedom of presentation as the control of the hand by using a depth camera. The proposed method recognizes the horizontal and vertical positions of hand pointer and the distance between hand and camera from both depth and RGB cameras, then performs a presentation event as the location and pattern that the hand touches a screen. The simulation results show that a camera is fixed on left side of the screen, and nine presentation events is correctly performed.
Subjective Video Quality Comparison of 3D Display Monitors
Youn, Sungwook ; Ok, Jiheon ; Yim, Donghyun ; Han, Taehwan ; Lee, Chulhee ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 416~424
DOI : 10.5909/JBE.2013.18.3.416
Recently, efforts have been made to develop international standards related to 3DTV quality assessment underway in International Telecommunication Union and Video Quality Experts Group. Unlike conventional 2D displays, there are several types of 3D display monitors: passive glasses, active glasses and auto-stereoscopic. In this paper, we performed subjective video quality tests using various 3D display monitors, in order to examine whether these display monitors can produce consistent perceptual video quality scores for processed video sequences. The experimental results show that the subjective scores of those 3D monitors are highly correlated and it appears that similar subjective scores will be obtained even when different types of 3D displays are used.
Measuring Visual Fatigue of Glasses-free Interactive 3D System Under Various Viewing Conditions
Kim, Jung-Yul ; Li, Hyung-Chul O. ; Kim, ShinWoo ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 425~434
DOI : 10.5909/JBE.2013.18.3.425
Observers usually experience visual fatigue when they watch contents displayed on 3D display. There has been various research on visual fatigue incurred in stereoscopic displays that use 3D glasses, but relatively less studies have been done in the area of autostereoscopic displays. i3D system refers to interactive 3D system that makes it possible for users to interact with contents using their hands. Current research measured visual fatigue that users experience from i3D under various visual environments. We examined the effects of viewing distance, disparities and visual orientation on visual fatigue in i3D. The results indicated that visual fatigue decreased with longer distance and smaller disparity. Visual fatigue increased with angle when 3D fusion was unstable. In addition, there was an interaction effect between angle and distance in which visual fatigue increased with distance under stable 3D fusion but there was no difference in visual fatigue as a function of distance when 3D fusion was unstable. These results would be importantly used to develop autostereoscopic displays that minimize visual fatigue.
Improved Channel Profile Measurement Technique for ATSC Terrestrial DTV System
Lee, Jaekwon ; Jeon, Sung-Ho ; Kim, Jung-Hyun ; Suh, Young-Woo ; Kyung, Il-Soo ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 435~444
DOI : 10.5909/JBE.2013.18.3.435
ATSC terrestrial DTV system can support high data rates for HDTV(High Definition Television) service, but it suffers from significant performance degradation caused by multipath fading. Thus, it is necessary to analyze multipath fading effects in order to enhance the DTV reception performance. Generally, DTV channel profile can be obtained by auto-correlation between reference pseudo random signal and received DTV signal. However, in the ATSC terrestrial DTV system, the estimation performance of DTV channel profile may be decreased due to the VSB modulation features. In this paper, improved DTV channel profile measurement technique is analyzed and proposed.
Interference Analysis of Wireless Systems with Arbitrary Antenna Patterns and Geographic Information in the VHF/UHF Bands
Suh, Kyoung-Whoan ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 445~454
DOI : 10.5909/JBE.2013.18.3.445
By using the radio propagation prediction of Rec. ITU-R P.1546, geographic information system, and S-I plane, we presented the methodology of interference analysis based on the minimum coupling loss, and also suggested the local coordinate system for calculating azimuth and elevation angles between the victim receiver and the interferer for an arbitrary antenna pattern. To check the presented algorithm, the map with the land-sea mixed area was taken for the given area of
as real geography information. Field strength, path profile, and protection ratio with maximum allowable interference level have been illustrated for radar and fixed wireless system for the assumed frequency. In addition interference power of the victim receiver was calculated asa function of azimuth and elevation angles of the interferer. The developed methodology of interference analysis in the VHF and UHF bands can be actually applied to assess interoperability as well as compatibility in the civil or military applications.
SNR-based Weight Control for the Spatially Preprocessed Speech Distortion Weighted Multi-channel Wiener Filtering
Kim, Gibak ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 455~462
DOI : 10.5909/JBE.2013.18.3.455
This paper introduces the Spatially Preprocessed Speech Distortion Weighted Multi-channel Wiener Filter (SP-SDW-MWF) for multi-microphone noise reduction and proposes a method to determine the speech distortion weights. The SP-SDW-MWF is known as a robust noise reduction algorithm against the error caused by the mismatch in microphones. The SP-SDW-MWF adopts weights which determine the amount of noise reduction at the expense of introducing speech distortion in the noise-suppressed speech. In this paper, we use the error of power spectral density between the estimated signal and the desired signal as the evaluation measure. Thus the a priori SNR is used to control the speech distortion weights in the frequency domain. In the experimental results, the proposed method yields better result in terms of MFCC distortion compared to the conventional method.
Super-Resolution Image Reconstruction Using Multi-View Cameras
Ahn, Jae-Kyun ; Lee, Jun-Tae ; Kim, Chang-Su ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 463~473
DOI : 10.5909/JBE.2013.18.3.463
In this paper, we propose a super-resolution (SR) image reconstruction algorithm using multi-view images. We acquire 25 images from multi-view cameras, which consist of a
array of cameras, and then reconstruct an SR image of the center image using a low resolution (LR) input image and the other 24 LR reference images. First, we estimate disparity maps from the input image to the 24 reference images, respectively. Then, we interpolate a SR image by employing the LR image and matching points in the reference images. Finally, we refine the SR image using an iterative regularization scheme. Experimental results demonstrate that the proposed algorithm provides higher quality SR images than conventional algorithms.
Inter-carrier Interference Reduction Method Using Mask in a Fast Moving OFDM Receiver
Gu, Young Mo ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 474~480
DOI : 10.5909/JBE.2013.18.3.474
In orthogonal frequency division multiplexing system (OFDM), rapid channel variation caused by fast moving receiver leads to a loss of subcarrier orthogonality which results in inter-carrier interference (ICI) and receiver performance degradation. In conventional receivers, performance is enhanced by estimating ICI and removing it from received signals. In this paper, an ICI reduction scheme using a time-domain mask and adding is proposed. The proposed scheme is applied to DVB-T receiver to prove the Doppler mobile performance enhancement.
Evaluation of Tracking Performance: Focusing on Improvement of Aiming Ability for Individual Weapon
Kim, Sang Hoon ; Yun, Il Dong ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 481~490
DOI : 10.5909/JBE.2013.18.3.481
In this paper, an investigation of weapon tracking performance is shown in regard to improving individual weapon performance of aiming objects. On the battlefield, a battle can last only a few hours, sometimes it can last several days until finished. In these long-lasting combats, a wide variety of factors will gradually lower the visual ability of soldiers. The experiments were focusing on enhancing the degraded aiming performance by applying visual tracking technology to roof mounted sights so as to track the movement of troops automatically. In order to select the optimal algorithm among the latest visual tracking techniques, performance of each algorithm was evaluated using the real combat images with characteristics of overlapping problems, camera's mobility, size changes, low contrast images, and illumination changes. The results show that VTD (Visual Tracking Decomposition), IVT (Incremental learning for robust Visual Tracking), and MIL (Multiple Instance Learning) perform the best at accuracy, response speed, and total performance, respectively. The evaluation suggests that the roof mounted sights equipped with visual tracking technology are likely to improve the reduced aiming ability of forces.
Stochastic Low-Power and Buffer-Stable Routing for Gigabit Wireless Video Networks
Kim, Joongheon ; Ryu, Eun-Seok ;
Journal of Broadcast Engineering, volume 18, issue 3, 2013, Pages 491~494
DOI : 10.5909/JBE.2013.18.3.491
This paper proposes a stochastic/dynamic routing protocol which aims the minimization of the summation of time average expected power expenditure with buffer stability in mobile ad-hoc 60 GHz wireless networks. By using 60 GHz RF, the wireless devices can transmit/receive 1080p HD video signals without compression. In addition, our algorithm works without centralized controller, so that the distributed operation is available. The novelty of the proposed algorithm was also verified by simulations.