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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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Face Authentication using Multi-radius LBP Matching of Individual Major Blocks in Mobile Environment
Lee, Jeong-Sub ; Ahn, Hee-Seok ; Keum, Ji-Soo ; Kim, Tai-Hyung ; Lee, Seung-Hyung ; Lee, Hyon-Soo ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 515~524
DOI : 10.5909/JBE.2013.18.4.515
In this paper, we propose a novel face authentication method based on LBP matching of individual major blocks in mobile environment. In order to construct individual major blocks from photos, we find the blocks that have the highest similarity and use different numbers of blocks depending on the probability distribution by applying threshold. And, we use multi-radius LBP histograms in the determination of individual major blocks to improve performance of generic LBP histogram based approach. By using the multi-radius LBP histograms in face authentication, we can successfully reduce the false acceptance rate compare to the previous methods. Also, we can see that the proposed method shows low error rate about 7.72% compare to the pervious method in spite of use small number of blocks about 44.59% only.
Automatic TFT-LCD Mura Defect Detection using Gabor Wavelet Transform and DCT
Cho, Sang-Hyun ; Kang, Hang-Bong ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 525~534
DOI : 10.5909/JBE.2013.18.4.525
Recently, mura defect inspection techniques are receiving attention in LCD production procedure since demands of TFT-LCD are growing. In this paper, we propose an automatic mura defect inspection method using gabor wavelet transform and DCT. First, we generate a reference panel image using DCT based method. For original panel image and generated reference panel image, we apply a gabor wavelet transform to eliminate texture information in images. Then, we extract mura defect regions from the difference image between gabor wavelet transform image of original panel and generated reference panel image. Finally, all mura defect regions are quantified to detect accurate mura defects. Experimental results show that our method is more accurate and efficient than previous methods.
High-Performance Vision Engine for Intelligent Vehicles
Lyuh, Chun-Gi ; Chun, Ik-Jae ; Suk, Jung-Hee ; Roh, Tae Moon ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 535~542
DOI : 10.5909/JBE.2013.18.4.535
In this paper, we proposed a advanced hardware engine architecture for high speed and high detection rate image recognitions. We adopted the HOG-LBP feature extraction algorithm and more parallelized architecture in order to achieve higher detection rate and high throughput. As a simulation result, the designed engine which can search about 90 frames per second detects 97.7% of pedestrians when false positive per window is
A Method for Motion Artifact Compensation of PPG Signal
Kim, Hansol ; Lee, Eui Chul ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 543~549
DOI : 10.5909/JBE.2013.18.4.543
Motion artifacts of central and autonomic nervous system signals degrades the performance of the bio-signal based human factor analysis. Firstly, we propose a defining method of motion artifact section by analyzing successive image frames. Motion artifact section is defined when the amount of motion is greater than the pre-defined threshold. In here, the amount of motion is estimated by first derivation of image frames at temporal domain. Secondly, we propose another defining method of motion artifact section through designing 2D Gaussian probability density function model by analyzing feature vectors of one cycle of signal such as length and amplitude. The defined motion artifact sections are interpolated on the basis of 1D Gaussian function. At result of applying the method into photoplethysmography signal, we confirmed that the calculated heartbeat rate from the restored photoplethysmography came up to the one from electrocardiography. Also, we found that the video based method generated relatively more false acceptance of motion artifact section and the probability density function based method generated relatively more false rejection of motion artifact section.
Visible Image Enhancement Method Considering Thermal Information from Infrared Image
Kim, Seonkeol ; Kang, Hang-Bong ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 550~558
DOI : 10.5909/JBE.2013.18.4.550
The infrared and visible images are represented by different information due to the different wavelength of the light. The infrared image has thermal information and the visible image has texture information. Desirable results are obtained by fusing infrared and visible information. To enhance a visible image, we extract a weight map from a visible image using saturation, brightness. After that, the weight map is adjusted using thermal information in the infrared image. Finally, an enhanced image is resulted from combining an infrared image and a visible image. Our experiment results show that our proposed algorithm is working well to enhance the smoke in the original image.
Overlay Text Graphic Region Extraction for Video Quality Enhancement Application
Lee, Sanghee ; Park, Hansung ; Ahn, Jungil ; On, Youngsang ; Jo, Kanghyun ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 559~571
DOI : 10.5909/JBE.2013.18.4.559
This paper has presented a few problems when the 2D video superimposed the overlay text was converted to the 3D stereoscopic video. To resolve the problems, it proposes the scenario which the original video is divided into two parts, one is the video only with overlay text graphic region and the other is the video with holes, and then processed respectively. And this paper focuses on research only to detect and extract the overlay text graphic region, which is a first step among the processes in the proposed scenario. To decide whether the overlay text is included or not within a frame, it is used the corner density map based on the Harris corner detector. Following that, the overlay text region is extracted using the hybrid method of color and motion information of the overlay text region. The experiment shows the results of the overlay text region detection and extraction process in a few genre video sequence.
A Study on Terrestrial UHDTV Broadcasting and Construction of Direct Reception Environment by DVB-T2
Park, Sung-Kyu ; Jo, Young-Joon ; Kim, Dong-Woo ; Park, Goo-Man ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 572~588
DOI : 10.5909/JBE.2013.18.4.572
In this paper, 4K-UHDTV or 8K-UHDTV and UHD-3DTV that the next generation broadcasting implementation and the possibility of direct receiving environment construction is analyzed on the terrestrial broadcasting. Particularly, we investigated the possibility by analyzing the previous and related works with regard to UHDTV transmission by DVB-T2 that is one of the best commercialized transmission mode. In order that the UHDTV broadcasting succeeds once again after completion of digital terrestrial switch over at the end of 2012, the ultra high resolution image transfer is important. However, the direct, the indoor and ubiquitous receiving environment is important in not only TV but also the personal type multimedia terminal in the sense of UHDTV service penetration. Therefore, in this paper, by using SFN and high error-correcting mode in DVB-T2 standard, the efficient frequency utilization and effective reception environment construction is illustrated. Particularly, SFN network constitution by 2 mutually different frequencies including the VHF bandwidth and UHF band, and etc. is shown. And the method that builds the free wireless receive environment by using SFN low power radio repeater and for home use gap filler is proposed. And the effect and frequency amount required are presented, when UHDTV broadcasting use 10MHz bandwidth.
The Effects of Roll Misalignment Errors, Shooting Distance, and Vergence Condition of 3D Camera on 3D Visual Fatigue
Li, Hyung-Chul O. ; Park, JongJin ; Kim, ShinWoo ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 589~598
DOI : 10.5909/JBE.2013.18.4.589
In order to understand 3D visual fatigue, it is necessary to examine the visual fatigue induced by camera parameters as well as that induced by a pre-existing 3D content. In the present study, we examined the effects of camera parameters, such as roll misalignment error, shooting distance and vergence condition on 3D visual fatigue and we modelled it. The results indicate that roll misalignment error, shooting distance and vergence condition affect 3D visual fatigue and the effect of roll misalignment error on 3D visual fatigue is evident specifically when screen disparity is relatively small.
Efficient Motion Compensated Interpolation Technique Using Image Resizing
Kwon, Hye-Gyung ; Lee, Chang-Woo ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 599~608
DOI : 10.5909/JBE.2013.18.4.599
Motion compensated interpolation (MCI) techniques are used for increasing the frame rate and generating the side information in the distributed video coding (DVC) system. In this paper, an efficient MCI technique using the image resizing in the DCT or LiftLT domain is proposed, and the performance of the MCI technique using various sub-pixel generation techniques is analyzed. Extensive computer simulations show that the proposed method produces the superior results compared to the conventional methods.
Image Segmentation using Multi-scale Normalized Cut
Lee, Jae-Hyun ; Lee, Ji Eun ; Park, Rae-Hong ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 609~618
DOI : 10.5909/JBE.2013.18.4.609
This paper proposes a fast image segmentation method that gives high segmentation performance as graph-cut based methods. Graph-cut based image segmentation methods show high segmentation performance, however, the computational complexity is high to solve a computationally-intensive eigen-system. This is because solving eigen-system depends on the size of square matrix obtained from similarities between all pairs of pixels in the input image. Therefore, the proposed method uses the small-size square matrix, which is obtained from all the similarities among regions obtained by segmenting locally an image into several regions by graph-based method. Experimental results show that the proposed multi-scale image segmentation method using the algebraic multi-grid shows higher performance than existing methods.
An Edge Directed Color Demosaicing Algorithm Considering Color Channel Correlation
Yoo, Du Sic ; Lee, Min Seok ; Kang, Moon Gi ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 619~630
DOI : 10.5909/JBE.2013.18.4.619
In this paper, we propose an edge directed color demosaicing algorithm considering color channel correlation. The proposed method consists of local region classification step and edge directional interpolation step. In the first step, each region of a given Bayer image is classified as normal edge, pattern edge, and flat regions by using intra channel and inter channel gradients. Especially, two criteria and verification process for the normal edge and pattern edge classification are used to reduce edge direction estimation error, respectively. In the second step, edge directional interpolation process is performed according to characteristics of the classified regions. For horizontal and vertical directional interpolations, missing color components are obtained from interpolation equations based on intra channel and inter channel correlations in order to improve the performance of the directional interpolations. The simulation results show that the proposed algorithm outperforms conventional approaches in both objective and subjective terms.
Early Decision of Transform unit for HEVC
Kang, Jang-Byung ; Choi, Haechul ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 631~642
DOI : 10.5909/JBE.2013.18.4.631
For the emerging High Efficiency Video Coding (HEVC) standard, a fast transform unit (TU) decision method is proposed. HEVC defines the TU representing a region sharing the same transformation, and it allows a residual block to be split into multiple TUs recursively to form a quadtree. By using the quadtree of TUs, HEVC supports various transform sizes from
. The various sizes of TUs can provide a good coding efficiency, whereas this may increase encoding complexity dramatically. In the assumption that a TU with highly compacted energy is unlikely to be split, the proposed method determines TU sizes according to the position of the last non-zero transform coefficient. In the experimental results, the proposed method reduced 18% encoding run time with the negligible coding loss of 0.7% BD-rate for the Random_access case.
An Improved AdaBoost Algorithm by Clustering Samples
Baek, Yeul-Min ; Kim, Joong-Geun ; Kim, Whoi-Yul ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 643~646
DOI : 10.5909/JBE.2013.18.4.643
We present an improved AdaBoost algorithm to avoid overfitting phenomenon. AdaBoost is widely known as one of the best solutions for object detection. However, AdaBoost tends to be overfitting when a training dataset has noisy samples. To avoid the overfitting phenomenon of AdaBoost, the proposed method divides positive samples into K clusters using k-means algorithm, and then uses only one cluster to minimize the training error at each iteration of weak learning. Through this, excessive partitions of samples are prevented. Also, noisy samples are excluded for the training of weak learners so that the overfitting phenomenon is effectively reduced. In our experiment, the proposed method shows better classification and generalization ability than conventional boosting algorithms with various real world datasets.
An Adaptive Filtering Method for Enhancement of Inter-color Plane Estimation in HEVC RExt RGB Images
Choi, Jangwon ; Choe, Yoonsik ;
Journal of Broadcast Engineering, volume 18, issue 4, 2013, Pages 647~650
DOI : 10.5909/JBE.2013.18.4.647
HEVC RExt(High Efficiency Video Coding Range Extension) set a goal to support RGB/YUV 4:2:2 4:4:4 color sampling and over 10 bit-depth images. Unlike the previous 4:2:0 color sampling images, RGB images have the high correlation in inter-color planes. Using this characteristic, some methods which are contributed in JCT-VC standardization meetings estimate the pixel values of inter-color plane. But when we use the estimation of inter-color plane in RGB images, high frequency components of RGB images are caused to reduce the coding efficiency because they usually have the low inter-color plane correlation. Therefore, in this paper, we propose an adaptive low pass filtering method in the inter-color plane estimation. Using this method, we can improve the estimation efficiency of inter-color plane in RGB images. The experimental results with HEVC RExt RGB test sequences show that the proposed method has 0.6% BD(Bjontegaard Distortion)-rate gain and some increased complexity compared to the previous inter-color plane estimation method.