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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 20, Issue 6 - Nov 2015
Volume 20, Issue 5 - Sep 2015
Volume 20, Issue 4 - Jul 2015
Volume 20, Issue 3 - May 2015
Volume 20, Issue 2 - Mar 2015
Volume 20, Issue 1 - Jan 2015
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Digital Hologram Encryption Algorithm using Fresnel Diffraction
Lee, Yoon-Hyuk ; Seo, Young-Ho ; Kim, Dong-Wook ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 807~817
DOI : 10.5909/JBE.2015.20.6.807
This paper is to propose an encryption method for only an allowed user to see the content for a digital hologram, that is a high value-added content. This paper uses a characteristic of Fresnel transform that the object region is concentrated to a relatively small part of the diffraction plane. By encrypting the concentrated part only the region to be encrypted and in turn the amount of data to be encrypted is reduced a lot, which results in an high efficiency with low encryption rate. As the methodology, a digital hologram is first Fresnel transformed for reconstruction and the result is secondly Fresnel transformed to concentrate the energy into the center of the diffraction plane to encrypt the concentrated region only. For the 2nd transform, energy concentration degree is determined by adjusting the diffraction distance and encryption strength is determined by adjusting the scaling factor. For this we analyze the optimal encryption area according to the diffraction distance and the scaling factor. When applying the proposed method with diffraction distance of 20m the object information was visually unrecognizable with the encryption ratio only 0.005% ~ 0.02%.
Elaborate Image Quality Assessment with a Novel Luminance Adaptation Effect Model
Bae, Sung-Ho ; Kim, Munchurl ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 818~826
DOI : 10.5909/JBE.2015.20.6.818
Recently, objective image quality assessment (IQA) methods that elaborately reflect the visual quality perception characteristics of human visual system (HVS) have actively been studied. Among those characteristics of HVS, luminance adaptation (LA) effect, indicating that HVS has different sensitivities depending on background luminance values to distortions, has widely been reflected into many existing IQA methods via Weber's law model. In this paper, we firstly reveal that the LA effect based on Weber's law model has inaccurately been reflected into the conventional IQA methods. To solve this problem, we firstly derive a new LA effect-based Local weight Function (LALF) that can elaborately reflect LA effect into IQA methods. We validate the effectiveness of our proposed LALF by applying LALF into SSIM (Structural SIMilarity) and PSNR methods. Experimental results show that the SSIM based on LALF yields remarkable performance improvement of 5% points compared to the original SSIM in terms of Spear rank order correlation coefficient between estimated visual quality values and measured subjective visual quality scores. Moreover, the PSNR (Peak to Signal Noise Ratio) based on LALF yields performance improvement of 2.5% points compared to the original PSNR.
A Study on the Recognition of Information Accepter about Civil Defence Alert Broadcasting
Kwak, Chunsub ; Kyung, Ilsoo ; Lee, Hyunji ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 827~836
DOI : 10.5909/JBE.2015.20.6.827
The purpose of this study is to suggest improvement direction of the delivery system through researching the information accepter' recognition and use about warning delivery system. According to the survey, they listen to civil defence alert broadcasting on mass media more than personal media. The frequency of alert broadcasting is significantly very low and they listen to it below 5 times in a year. Also, nearly one in four people says its siren and contents are indistinct. Alert broadcasting's siren shows less memory retrieval and sorting capability than others and the result shows that they will act based on the broadcasting instead of reacting to prior knowledge in real situations. Finally, the result shows that improving public awareness through education and publicity more than social system buildup is important in civil defence alert system.
Analysis of Spatial Modulation MIMO Reception Performance for UHDTV Broadcasting
Park, Myung Chul ; Han, Dong Seog ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 837~847
DOI : 10.5909/JBE.2015.20.6.837
In this paper, the reception performance of spatial modulation multiple-output multiple-input (MIMO) is analyzed for high speed terrestrial broadcasting. The MIMO scheme is required to reduce the inter symbol interference (ISI) and spatial correlation. The spatial modulation scheme solves the problem of ISI, but the spatial correlation degrades the reception performance of SM scheme. The space-time block coded spatial modulation (STBC-SM) is combined the SM system with space-time block code (STBC) for reducing the effects of the spatial correlation. However, the STBC-SM scheme degrades the spectral efficiency by transmitting same data in the two symbol period. The double space-time transmit diversity with spatial modulation (DSTTD-SM) scheme transmits the data with full antenna combination. To adapt these SM MIMO systems into the terrestrial broadcasting system, the reception performance is analyzed using computer simulation in SUI channel environments.
Classification and Recommendation of Scene Templates for PR Video Making Service based on Strategic Meta Information
Park, Jongbin ; Lee, Han-Duck ; Kim, Kyung-Won ; Jung, Jong-Jin ; Lim, Tae-Beom ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 848~861
DOI : 10.5909/JBE.2015.20.6.848
In this paper, we introduce a new web-based PR video making service system. Many video editing tools have required tough editing skill or scenario planning stage for a just simple PR video making. Some users may prefer a simple and fast way than sophisticated and complex functionality. To solve this problem, it is important to provide easy user interface and intelligent classification and recommendation scheme. Therefore, we propose a new template classification and recommendation scheme using a topic modeling method. The proposed scheme has the big advantage of being able to handle the unstructured meta data as well as structured one.
Fast Intra Coding using DCT Coefficients
Kim, Ga-Ram ; Kim, Nam-Uk ; Lee, Yung-Lyul ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 862~870
DOI : 10.5909/JBE.2015.20.6.862
The RDO (Rate Distortion Optimization) process of HEVC results in good coding efficiency, but relatively requires much encoding time. In order to reduce the encoding time of RDO process, this paper proposes a method of fast intra prediction mode decision using DCT coefficients distributions and the existence of DCT coefficients. The proposed fast Intra coding sets the number of intra prediction mode candidates to three(3) from the RMD (Rough Mode Decision) process in HM16.0 reference SW and reduces the number of candidates one more time by investigating DCT coefficients distribution. After that, if there exists a quantized DCT block having all zero coefficient values for a specific candidate before the RDO process, the candidate is chosen without the RDO process. The proposed method reduces the encoder complexity on average 46%, while the coding efficiency is 2.1% decreased compared with the HEVC encoder.
An analysis of Scene Change Detection using HEVC coding additional information
Eom, Yumi ; Park, Sangil ; Chung, Chang Woo ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 871~879
DOI : 10.5909/JBE.2015.20.6.871
With the increase of mass contents data, a method of a scene change detection is required for analysis, indexing and editing. Although many researchers are studying a variety of scene change detection method, it is too difficult to accurately detect various movements of the cameras and scene changes. Also, earlier scene change detection methods take too much time to apply to UHD video contents. That is because the UHD video contents with 4K (3820x2160) resolution or higher have greater amount of data. Therefore a method for detecting a scene change by using the next-generation codec, HEVC, is required. In this paper, we propose four scene change detection methods using the coding additional information of HEVC, and a new pixel-based scene change detection system. Furthermore, through the experimental results, we check the possibility of detecting the scene changes of UHD videos encoded in HEVC format.
Frame Rate Up-Conversion Considering The Direction and Magnitude of Identical Motion Vectors
Park, Jonggeun ; Jeong, Jechang ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 880~887
DOI : 10.5909/JBE.2015.20.6.880
In this paper, frame rate up conversion (FRUC) algorithm considering the direction and magnitude of identical motion vectors is proposed. extended bilateral motion estimation (EBME) has higher complexity than bilateral motion estimation (BME). By using average magnitude of motion vector with x and y direction respectively, dynamic frame and static frame are decided. We reduce complexity to decide EBME. also, After we compare the direction and magnitude of identical motion vectors, We reduce complexity to decide motion vector smoothing(MVS). Experimental results show that this proposed algorithm has fast computation and better peak singnal to noise ratio(PSNR) results compared with EBME.
A Robust Blind Watermarking for Digital Image Using DWT According to its Resolution
Lee, Yongseok ; Seo, Youngho ; Kim, Dongwook ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 888~900
DOI : 10.5909/JBE.2015.20.6.888
This paper proposes a blind watermarking scheme using DWT satisfying robustness, invisibility, and security to protect the ownership of digital image contents. This scheme does not determine any watermarking position by local image information. It rather inserts the watermark information into all the four lowest frequency subbands after transforming the host image by n-level 2-dimensional DWT, depending on, the sizes of the host image and the watermark data. Its watermark insertion methodology uses some weighting factors according to the kind of the subband and its energy level to adjust the invisibility and the robustness of the watermark. This method is experimented for various pixel-value change attacks and geometric attacks with various images having different resolutions and aspect ratios. With the experimental results and by comparing with existing methods, we show that the proposed method has a great deal of general usage with good watermark invisibility and good robustness against attacks.
The Development of Stereotest using Gabor Images in 3D Environment: An Explorative Study
Kham, Keetaek ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 901~911
DOI : 10.5909/JBE.2015.20.6.901
Many studies tried to develop a 3D display based stereo test as a substitute for the conventional stereo test. Although many 3D monitor based stereo tests have various advantages over the conventional stereo tests with printed stimuli, they have a crucial limitation in manipulating disparity. The least value for disparity manipulation is one pixel, which is too big to screen the normal stereo acuity in pc environment with a short viewing distance. In this explorative study, a Gabor image was employed as a test stimulus, because its position can be manipulated by changing its phase information, which allows sub-pixel manipulation for disparity. Instead of employing the methods of the conventional stereo tests where measurement was made only once for each of a wide range of disparity values, 10 replications were administrated for each of 6 disparity levels. The results from the test using Gabor images were compared with those using random dot stimulus because the latter stimulus was exactly the same as that of the conventional stereo test. The correlation coefficient between two tests was found to be moderate. After one month later, the whole test was repeated in the same settings. The correlation coefficient between test and retest results from Gabor images was found to be as high as that from a random dot stimulus, implying high test-retest reliability. These results suggest that a Gabor stimulus could be used as a test stimulus for the valid and reliable stereo test, even in the limited condition, such as 3D environment with a short viewing distance and a condition for evaluating the stereo acuity very precisely.
Performance Optimization of LLAH for Tracking Random Dots under Gaussian Noise
Park, Hanhoon ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 912~920
DOI : 10.5909/JBE.2015.20.6.912
Unlike general texture-based feature description algorithms, Locally Likely Arrangement Hashing (LLAH) algorithm describes a feature based on the geometric relationship between its neighbors. Thus, even in poor-textured scenes or large camera pose changes, it can successfully describe and track features and enables to implement augmented reality. This paper aims to optimize the performance of LLAH algorithm for tracking random dots (= features) with Gaussian noise. For this purpose, images with different number of features and magnitude of Gaussian noise are prepared. Then, the performance of LLAH algorithm according to the conditions: the number of neighbors, the type of geometric invariants, and the distance between features, is analyzed, and the optimal conditions are determined. With the optimal conditions, each feature could be matched and tracked in real-time with a matching rate of more than 80%.
An Efficient DPB Design Scheme for Scalable Multi-view Video Coding Using GPB Mechanism
Junga, Tae-jun ; Ko, Myung Pil ; Seo, Kwang-deok ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 921~927
DOI : 10.5909/JBE.2015.20.6.921
In this paper, we propose a novel design scheme for the operation of Decoded Picture Buffer (DPB) including reference picture re-ordering, marking process, and reference picture list construction to perform an efficient scalable multi-view video coding. Extensive simulations show that the proposed method can provide improved compression efficiency and improved video quality measured in terms of BD-Rate and BD-PSNR for the scalable multi-view video coding.
A Portable Head Up Display System with A Multi Windows for Vehicles
Chi, Yongseok ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 928~937
DOI : 10.5909/JBE.2015.20.6.928
A portable head up display (HUD) using the optical combiner lens with a 0.47inch LCD panel for a portable multi-windows virtual display is proposed. The proposed system consists of several micro panels, optical devices, and RGB 3in1 light-emitting diodes (LED) for making the full color display, and video and audio format for the high definition multimedia interface (HDMI) for the connecting between HUD and mobile phone. The multi-windows HUD is designed as an alternative to conventional built-in type HUD targeting the mass volume aftermarket at an affordable price.
Speed-limit Sign Recognition Using Convolutional Neural Network Based on Random Forest
Lee, EunJu ; Nam, Jae-Yeal ; Ko, ByoungChul ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 938~949
DOI : 10.5909/JBE.2015.20.6.938
In this paper, we propose a robust speed-limit sign recognition system which is durable to any sign changes caused by exterior damage or color contrast due to light direction. For recognition of speed-limit sign, we apply CNN which is showing an outstanding performance in pattern recognition field. However, original CNN uses multiple hidden layers to extract features and uses fully-connected method with MLP(Multi-layer perceptron) on the result. Therefore, the major demerit of conventional CNN is to require a long time for training and testing. In this paper, we apply randomly-connected classifier instead of fully-connected classifier by combining random forest with output of 2 layers of CNN. We prove that the recognition results of CNN with random forest show best performance than recognition results of CNN with SVM (Support Vector Machine) or MLP classifier when we use eight speed-limit signs of GTSRB (German Traffic Sign Recognition Benchmark).
The Effect of Number of Running Screens and Viewers in the Theaters, Genres, Holdback Period on the Number of Purchases of Movie VOD in the Digital Cable TV Subscribers
Park, Sun-Kyoo ; Choi, Seong-Jhin ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 950~962
DOI : 10.5909/JBE.2015.20.6.950
This paper analyzes the effect of the number of viewers and the number of running screens in the theater, genres of the movies and holdback period on the number of purchases movie VOD contents. In this paper, we deals with the 169 movies VOD consumption data which the digital cable TV subscribers purchased during the third quarter of 2013. As a result of the research, the average number of VOD purchases per each movie is 2,540. Regression analysis proves that the number of running screens and the holdback period are statistically playing a role of significance in movie VOD purchases. But the number of viewers in the theaters is not of significance. By genres, the result is shown as in this order: SF/fantasy 8,401 > dramas 4,011 > comedies 2,011 > action 1,789 > animation 1,138 > love story/melo 1,119 > horror/thriller 770 > erotic movies 636.
A Programmable Multi-Format Video Decoder
Kim, Jaehyun ; Park, Goo-man ;
Journal of Broadcast Engineering, volume 20, issue 6, 2015, Pages 963~966
DOI : 10.5909/JBE.2015.20.6.963
This paper introduces a programmable multi-format video decoder(MFD) to support HEVC(High Efficiency Video Coding) standard and for other video coding standards. The goal of the proposed MFD is the high-end FHD(Full High Definition) video decoder needed for a DTV(Digital Tele-Vision) SoC(System on Chip). The proposed platform consists of a hybrid architecture that is comprised of reconfigurable processors and flexible hardware accelerators to support the massive computational load and various kinds of video coding standards. The experimental results show that the proposed architecture is operating at a 300MHz clock that is capable of decoding HEVC bit-stream of FHD 30 frames per second.