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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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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High-Performance VLSI Architecture for Stereo Vision
Seo, Youngho ; Kim, Dong-Wook ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 669~679
DOI : 10.5909/JBE.2013.18.5.669
This paper proposed a new VLSI (Very Large Scale Integrated Circuit) architecture for stereo matching in real time. We minimized the amount of calculation and the number of memory accesses through analyzing calculation of stereo matching. From this, we proposed a new stereo matching calculating cell and a new hardware architecture by expanding it in parallel, which concurrently calculates cost function for all pixels in a search range. After expanding it, we proposed a new hardware architecture to calculate cost function for 2-dimensional region. The implemented hardware can be operated with minimum 250Mhz clock frequence in FPGA (Field Programmable Gate Array) environment, and has the performance of 805fps in case of the search range of 64 pixels and the image size of
Real-time Temporal Synchronization and Compensation in Stereoscopic Video
Kim, Giseok ; Cho, Jae-Soo ; Lee, Gwangsoon ; Lee, Eung-Don ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 680~690
DOI : 10.5909/JBE.2013.18.5.680
In this paper, we propose a real-time temporal synchronization and compensation algorithm in stereoscopic video. Many temporal asynchronies are caused in the video editing stage and due to different transmission delays. These temporal asynchronies can degrade the perceived 3D quality. The goal of temporal alignment is to detect and to measure the temporal asynchrony and recover synchronization of the two video streams. In order to recover synchronization of the two video streams, we developed a method to detect asynchronies between the left and the right video streams based on a novel spatiogram information, which is a richer representation, capturing not only the values of the pixels but their spatial relationships as well. The proposed novel spatiogram additionally includes the changes of the spatial color distribution. Furthermore, we propose a block-based method for detection of the pair frame instead of one frame-based method. Various 3D experiments demonstrate the effectiveness of the proposed method.
Early Termination Algorithm of Merge Mode Search for Fast High Efficiency Video Coding (HEVC) Encoder
Park, Chan Seob ; Kim, Byung Gyu ; Jun, Dong San ; Jung, Soon Heung ; Kim, Youn Hee ; Seok, Jin Wook ; Choi, Jin Soo ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 691~701
DOI : 10.5909/JBE.2013.18.5.691
In this paper, an early termination algorithm for merge process is proposed to reduce the computational complexity in High Efficiency Video Coding (HEVC) encoder. In the HEVC, the same candidate modes from merge candidate list (MCL) are shared to predict a merge or merge SKIP mode. This search process is performed by the number of the obtained candidates for the both of the merge and SKIP modes. This may cause some redundant search operations. To reduce this redundant search operation, we employ the neighboring blocks which have been encoded in prior, to check on the contextual information. In this study, the spatial, temporal and depth neighboring blocks have been considered to compute a correlation information. With this correlation information, an early termination algorithm for merge process is suggested. When all modes of neighboring blocks are SKIP modes, then the merge process performs only SKIP mode. Otherwise, usual merge process of HEVC is performed Through experimental results, the proposed method achieves a time-saving factor of about 21.25% on average with small loss of BD-rate, when comparing to the original HM 10.0 encoder.
Lung and Airway Segmentation using Morphology Information and Spline Interpolation in Lung CT Image
Cho, Joon-Ho ; Kim, Jung-Chul ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 702~712
DOI : 10.5909/JBE.2013.18.5.702
In this paper, we proposed an algorithm that extracts the airway and lung without loss of information in spite of the pulmonary vessel and nodules of the chest wall in the chest CT images. We use a mask image in order to improve the performance and to save processing time of airway and lung segmentation. In the second step, by converting left and right lungs to binary image using the morphological information, we have removed the solitary pulmonary nodule to identify the value of the threshold lung and the chest wall. The last step is to connect the outer shell of the lung with cubic Spline interpolation by adding the perfect pixel and computing the distance of the removed part. Experimental results using Matlab verified that the proposed method could overcome the drawbacks of the conventional methods.
On the Importance of Tonal Features for Speech Emotion Recognition
Lee, Jung-In ; Kang, Hong-Goo ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 713~721
DOI : 10.5909/JBE.2013.18.5.713
This paper describes an efficiency of chroma based tonal features for speech emotion recognition. As the tonality caused by major or minor keys affects to the perception of musical mood, so the speech tonality affects the perception of the emotional states of spoken utterances. In order to justify this assertion with respect to tonality and emotion, subjective hearing tests are carried out by using synthesized signals generated from chroma features, and consequently show that the tonality contributes especially to the perception of the negative emotion such as anger and sad. In automatic emotion recognition tests, the modified chroma-based tonal features are shown to produce noticeable improvement of accuracy when they are supplemented to the conventional log-frequency power coefficient (LFPC)-based spectral features.
Multiple Layers Block Overlapped Histogram Equalization based on The Detail Information
Hwang, Jae-Min ; Kwon, Oh-Seol ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 722~729
DOI : 10.5909/JBE.2013.18.5.722
For low contrast images, a histogram equalization is possible to easily identify information when the intensity is concentrated in an image. Over contrast enhancement is the problem of generating an unnatural image cognitively because the focus of existing techniques was the contrast enhancement. In order to solve this problem, CLAHE method solves unnatural problems by limiting contrast using a maximum threshold. However, this method has an extra problem that concealed detail information in an image. This paper proposes a detail-map based on the multiple layers block overlapped histogram equalization in order to avoid loss of detail information. Loss of detail information has been made to minimize as combining images with limited contrast enhancement using a detail-map in each layers.
Constrained One-Bit Transform based Motion Estimation using Extension of Matching Error Criterion
Lee, Sanggu ; Jeong, Jechang ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 730~737
DOI : 10.5909/JBE.2013.18.5.730
In this paper, Constrained One-Bit Transform (C1BT) based motion estimation using extension of matching error criterion is proposed. C1BT based motion estimation algorithm exploiting Number of Non-Matching Points (NNMP) instead of Sum of Absolute Differences (SAD) that used in the Full Search Algorithm (FSA) facilitates hardware implementation and significantly reduces computational complexity. However, the accuracy of motion estimation is decreased. To improve inaccurate motion estimation, this algorithm based motion estimation extending matching error criterion of C1BT is proposed in this paper. Experimental results show that proposed algorithm has better performance compared with the conventional algorithm in terms of Peak-Signal-to-Noise-Ratio (PSNR).
Effects of the Convergence Training on Reduction of Visual Discomfort in 3D TV Environment
Kham, Keetaek ; Jeon, Hyunmin ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 738~748
DOI : 10.5909/JBE.2013.18.5.738
The present study investigated whether convergence training in which has an effect on reducing visual discomfort in viewing 3D TV. The stereoscopic depth of 3D training stimulus was gradually increased while maintaining individual visual discomfort at a minimum value. Participants were randomly assigned into one of three groups: a control group and two training groups. For both training groups, all procedure and the disparity range of training stimuli were the same except the order of the disparities of training stimuli. One of the two different training procedure was provided: gradual change or random change of the disparities of training stimulus. Training itself was very effective so that convergence fusional range was improved after three sessions of training with intervals of two weeks. In order to evaluate the effect of convergence training on visual discomfort, the subjective visual discomfort in 3D TV viewing was measured before and after training sessions using questionnaire. The results showed that a significant reduction in visual discomfort was found after training only in the group of gradual change. These results demonstrated a repeated convergence training might be helpful in reducing the visual discomfort in 3D TV environment.
The Impact of User Behavior, Contents, Function, Cost on Use Satisfaction and the Continued Use Intention of the N-screen Service Users
Kim, Dong-Woo ; Lee, Yeong-Ju ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 749~757
DOI : 10.5909/JBE.2013.18.5.749
This study aims to find out the influences of user behavior, content characteristics, functional factors and user's perception in cost on user satisfaction and continuous intention in N-Screen service. Web survey was conducted for 498 users who have used N screen service. The results show that the most influential factor contributing to user satisfaction is user interface. VOD diversity, payment system, cost, channel diversity are also meaningful factors. Identifying the critical factors which impact on user satisfaction, this study can provide the basic data for activating OTT service in smart media environment.
An Efficient Broadcast Encryption System with Delegation of Decryption
Han, Su Min ; Park, Seung Hwan ; Park, Jong Hwan ; Lee, Dong Hoon ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 758~770
DOI : 10.5909/JBE.2013.18.5.758
In a Broadcast Encryption System, a sender sends an encrypted message to a large set of receivers at once over an insecure channel and it enables only users in a target set to decrypt the message with their private keys. In 2005, Boneh et al. proposed a fully collusion-resistant public key broadcast encryption in which the ciphertext and the privatekey sizes are constant. In general, pairing-based broadcast encryption system is efficient in bandwidth and storing aspects than non-pairing based broadcast encryption system, however, it requires many computational costs that resource-constrained devices is not suit to be applied. In this paper, we propose a Broadcast Encryption scheme(called BEWD) that user can decrypt a ciphertext more efficiently. The scheme is based on Boneh et al.scheme. More precisely, it reduces receiver's computational costs by delegating pairing computation to a proxy server which computation is required to receiver in Boneh et al.scheme. Furthermore, the scheme enables a user to check if the proxy server compute correctly. We show that our scheme is secure against selective IND-RCCA adversaries under l-BDHE assumption.
Analysis of Voice Quality Features and Their Contribution to Emotion Recognition
Lee, Jung-In ; Choi, Jeung-Yoon ; Kang, Hong-Goo ;
Journal of Broadcast Engineering, volume 18, issue 5, 2013, Pages 771~774
DOI : 10.5909/JBE.2013.18.5.771
This study investigates the relationship between voice quality measurements and emotional states, in addition to conventional prosodic and cepstral features. Open quotient, harmonics-to-noise ratio, spectral tilt, spectral sharpness, and band energy were analyzed as voice quality features, and prosodic features related to fundamental frequency and energy are also examined. ANOVA tests and Sequential Forward Selection are used to evaluate significance and verify performance. Classification experiments show that using the proposed features increases overall accuracy, and in particular, errors between happy and angry decrease. Results also show that adding voice quality features to conventional cepstral features leads to increase in performance.