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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 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
Optimum Configuration of Single Frequency Network DMB to enhance the QoS and Service coverage
Cho, Young-Hun ; Won, Chung-Ho ; Seo, Jong-Soo ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 439~452
DOI : 10.5909/JBE.2014.19.4.439
This paper suggests the method to extend service area by using the transmit offset delay in T-DMB single frequency network (SFN). In general, synchronization of the transmit time of all site can be done by using the reference clock of GPS, which dose not reflect the details geographical characteristics and transmit specifications of each site. Applying the site-specific transmit offset delay, we could extend the service area of SFN T-DMB. Applying the transmit offset delay, it is found that the signal quality in the region of weak receive field strength was improved and upto 4~8 km service area expansion was achieved by satisfying the minimum field strength (
) recommended by the Korea Communications Commission (KCC). Site-specific offset delay was calculated considering the geographic service area characteristics, distribution of electric field strength between neighboring sites and site-specific service target area. Experiments were carried out in order to analyze impact of calculated offset delay on the T-DMB SFN and also to confirm that the offset delay extends T-DMB service coverage. The experiment was done in metropolitan T-DMB service areas.
Bi-Histogram Equalization based on Differential Compression Method for Preserving the Trend of Natural Mean Brightness
Lee, Jae-Won ; Hong, Sung-Hoon ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 453~467
DOI : 10.5909/JBE.2014.19.4.453
A typical histogram equalization contrast enhancement effect for improving the image quality is excellent. However, because it appears that excessive changes of the brightness values, The average brightness of the image is changing in units of frames of applications such as a TV video is unsuitable. In order to solve these drawbacks, a modified method of histogram equalization on various studies have been made. But the result images of existing methods sometimes shown visual degradations such as over-enhancement and false contouring. In this paper, we propose improved contrast enhancement method through bi-histogram equalization using target mean brightness based on differential compression method. The proposed method is based on the average brightness value by dividing the histogram, the histogram for each zone, according to the frequency differential of compression. And equalize the modified histogram based on target mean brightness. This allows to suppress deterioration of picture quality, and changes in the average brightness of each frame of video, while maintaining and improving the contrast. Experimental results show that the proposed method compared to the conventional method, the average brightness of each frame from a movie well maintained, and no degradation of the image quality showed a good effect to improve the contrast.
Perceptual Quality-based Video Coding with Foveated Contrast Sensitivity
Ryu, Jiwoo ; Sim, Donggyu ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 468~477
DOI : 10.5909/JBE.2014.19.4.468
This paper proposes a novel perceptual quality-based (PQ-based) video coding method with foveated contrast sensitivity (FCS). Conventional methods on PQ-based video coding with FCS achieve minimum loss on perceptual quality of compressed video by exploiting the property of human visual system (HVS), that is, its sensitivity differs by the spatial frequency of visual stimuli. On the other hand, PQ-based video coding with foveated masking (FM) exploits the difference of the sensitivity of the HVS between the central vision and the peripheral vision. In this study, a novel FCS model is proposed which considers both the conventional DCT-based JND model and the FM model. Psychological study is conducted to construct the proposed FCS model, and the proposed model is applied to PQ-based video coding algorithm implemented on HM10.0 reference software. Experimental results show that the proposed method decreases bitrate by the average of 10% without loss on the perceptual quality.
Asymmetrical Role of Left and Right Eyes in 3-D Contents Production
Lim, Jae-A ; Nam, Jong-Ho ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 478~490
DOI : 10.5909/JBE.2014.19.4.478
In order to make 3-D display technique a better tool to provide viewers with realistic stereoscopic experience, various researches have been done in the many relevant fields. This psychophysical study was designed to investigate whether there was any difference in the perceptual processing between a dominant and non-dominant eye when a 3-D cue was provided exclusively to only one eye. We measured the reaction time for detecting a depth change by providing the viewer's each eyes with differential 3-D stimuli, which have systematical patterns. We obtained that there was a consistent 3-D perceptual performance when the 3-D cue was provided to the viewers' left eye regardless of their eye dominance. The result suggests that it might be a better technique to arrange the camera for left eye to carry 3-D cues to get the viewer's consistent 3-D perception.
An Analysis of Optimal Sequences for the Detection of Wake-up Signal in Disaster-preventing Broadcast
Park, Hae Yong ; Jo, Bonggyun ; Kim, Heung Mook ; Han, Dong Seog ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 491~501
DOI : 10.5909/JBE.2014.19.4.491
Recently, the need for disaster-preventing broadcast has increased gradually to cope with natural disaster like earthquake and tsunami causing enormous losses of both life and property. In disaster-preventing broadcast system, the wake-up signal is used to alert user terminal and switch the current state of channel to the emergency channel, which is for the fast and efficient delivery of emergency information. In this paper, we propose the detection method of wake-up signal for disaster-preventing broadcast systems. The wake-up signals for disaster-preventing broadcast should have a good auto-correlation property in low power and narrow-band conditions that does not affect the existing digital television (DTV) system. The suitability of the m-sequence and complementary code (CC) is analyzed for wake-up signals according to signal to noise ratio. A wake-up signal is proposed by combining the direct sequence spread spectrum (DSSS) technique and pseudo noise (PN) sequences such as Barker and Walsh-Hadamard codes. By using the proposed method, a higher detecting performance can be achieved by the spreading gain compared to the single long m-sequence and the Golay code.
Security Analysis of Broadcast Encryption System Based on 2-Subset Difference Method
Lee, Jae Hwan ; Park, Jong Hwan ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 502~509
DOI : 10.5909/JBE.2014.19.4.502
Broadcast encryption is a cryptographic primitive that allows a sender to securely transmit a message to a set of receivers. The most influential broadcast encryption system was proposed in 2001 by Naor, Naor, Lotspiech, based on binary trees and the Subset Difference (SD) method. In 2006, Jang, Nyang, and Song suggested a new broadcast encryption system that can reduce transmission rate by 50% compared to the SD method, by introducing the so-called '2-SD' method. Their result was later given the registration of a patent in Korea (registration number: 100879083). Unfortunately, however, this paper shows that Jang et. al.'s broadcast encryption system is not secure against collusion attacks that are considered as being the basic security requirement in designing broadcast encryption.
Block Ack-based Dynamic A-MPDU Aggregation Scheme in IEEE 802.11n WLAN
Shin, In Cheol ; Kim, Dong-Hoi ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 510~520
DOI : 10.5909/JBE.2014.19.4.510
By adopting the MAC(Media Access Control) protocol which enables to pack multiple MPDUs(MAC-level Protocol Data Units) into a single PPDU(Physical Layer Protocol Data Unit), IEEE 802.11n WLAN supports high throughput. Up to now, there have been a lot of existing channel information-based A-MPDU schemes dynamically determining the number of MSDUs according to the wireless channel condition information which is sent from the receiver to sender. However, the channel information-based scheme has a serious drawback having a high system overhead due to the frequent channel feedback information. To reduce the system overhead, the proposed BA-base dynamic A-MPDU scheme simply chooses the number of MSDUs to be retransmitted by not the frequent channel feedback information but the BA signal representing whether MPSUs belonging to the A-MPDU are received or not. Through NS-2(Network Simulator-2), we found that the proposed scheme had higher throughput and lower packet error rate than the existing fixed A-MPDU scheme.
Fast Algorithm for Disparity Estimation in ATSC-M/H based Hybrid 3DTV
Lee, Dong-Hee ; Kim, Sung-Hoon ; Lee, Jooyoung ; Kang, Dongwook ; Jung, Kyeong-Hoon ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 521~532
DOI : 10.5909/JBE.2014.19.4.521
ATSC-M/H based hybrid 3DTV, which is one of the service compatible 3DTV system, has considerable quality gap between the left and right views. And CRA(Conditional Replenishment Algorithm) has been proposed to deal with the issue of resolution mismatch and improve the visual quality. In CRA, the disparity vectors of stereoscopic images are estimated. The disparity compensated left view and simply enlarged right view are compared and conditionally selected for generating the enhanced right view. In order to implement CRA, a fast algorithm is strongly required because the disparity vectors need to be obtained at every layer and the complexity of CRA is quite high. In this paper, we adopted SDSP(Small Diamond Search Pattern) instead of full search and predicted the initial position of search pattern by examining the spatio-temporal correlation of disparity vectors and also suggested the SKIP mode to limit the number of processing units. The computer simulation showed that the proposed fast algorithm could greatly reduce the processing time while minimizing the quality degradation of reconstructed right view.
Hybrid Camera System with a TOF and DSLR Cameras
Kim, Soohyeon ; Kim, Jae-In ; Kim, Taejung ;
Journal of Broadcast Engineering, volume 19, issue 4, 2014, Pages 533~546
DOI : 10.5909/JBE.2014.19.4.533
This paper presents a method for a hybrid (color and depth) camera system construction using a photogrammetric technology. A TOF depth camera is efficient since it measures range information of objects in real-time. However, there are some problems of the TOF depth camera such as low resolution and noise due to surface conditions. Therefore, it is essential to not only correct depth noise and distortion but also construct the hybrid camera system providing a high resolution texture map for generating a 3D model using the depth camera. We estimated geometry of the hybrid camera using a traditional relative orientation algorithm and performed texture mapping using backward mapping based on a condition of collinearity. Other algorithm was compared to evaluate performance about the accuracy of a model and texture mapping. The result showed that the proposed method produced the higher model accuracy.