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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Multimedia Society
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Korea Multimedia Society
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Volume & Issues
Volume 18, Issue 12 - Dec 2015
Volume 18, Issue 11 - Nov 2015
Volume 18, Issue 10 - Oct 2015
Volume 18, Issue 9 - Sep 2015
Volume 18, Issue 8 - Aug 2015
Volume 18, Issue 7 - Jul 2015
Volume 18, Issue 6 - Jun 2015
Volume 18, Issue 5 - May 2015
Volume 18, Issue 4 - Apr 2015
Volume 18, Issue 3 - Mar 2015
Volume 18, Issue 2 - Feb 2015
Volume 18, Issue 1 - Jan 2015
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Hierarchical Compression Technique for Reflectivity Data of Weather Radar
Jang, Bong-Joo ; Lee, Keon-Haeng ; Lim, Sanghun ; Kwon, Ki-Ryong ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 793~805
DOI : 10.9717/kmms.2015.18.7.793
Nowadays the amount of data obtained from advanced weather radars is growing to provide higher spatio-temporal resolution. Accordingly radar data compression is important to use limited network bandwidth and storage effectively. In this paper, we proposed a hierarchical compression method for weather radar data having high spatio-temporal resolution. The method is applied to radar reflectivity and evaluated in aspects of accuracy of quantitative rainfall intensity. The technique provides three compression levels from only 1 compressed stream for three radar user groups-signal processor, quality controller, weather analyst. Experimental results show that the method has maximum 13% and minimum 33% of compression rates, and outperforms 25% higher than general compression technique such as gzip.
The Clip Limit Decision of Contrast Limited Adaptive Histogram Equalization for X-ray Images using Fuzzy Logic
Cho, Hyunji ; Kye, Heewon ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 806~817
DOI : 10.9717/kmms.2015.18.7.806
The contrast limited adaptive histogram equalization(CLAHE) is an advanced method for the histogram equalization which is a common contrast enhancement technique. The CLAHE divides the image into sections, and applies the contrast limited histogram equalization for each section. X-ray images can be classified into three areas: skin, bone, and air area. In clinical application, the interest area is limited to the skin or bone area depending on the diagnosis region. The CLAHE could deteriorate X-ray image quality because the CLAHE enhances the area which doesn`t need to be enhanced. In this paper, we propose a new method which automatically determines the clip limit of CLAHE`s parameter to improve X-ray image quality using fuzzy logic. We introduce fuzzy logic which is possible to determine clip limit proportional to the interest of users. Experimental results show that the proposed method improve images according to the user`s preference by focusing on the subject.
Selective Encryption Scheme for Vector Map Data using Chaotic Map
Bang, N.V. ; Moon, Kwang-Seok ; Lim, Sanghun ; Lee, Suk-Hwan ; Kwon, Ki-Ryong ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 818~826
DOI : 10.9717/kmms.2015.18.7.818
With the rapid interest in Geographic Information System (GIS) contents, a large volume of valuable GIS dataset has been distributed illegally by pirates, hackers, or unauthorized users. Therefore the problem focus on how to protect the copyright of GIS vector map data for storage and transmission. But GIS vector map data is very large and current data encryption techniques often encrypt all components of data. That means we have encrypted large amount of data lead to the long encrypting time and high complexity computation. This paper presents the selective encryption scheme using hybrid transform for GIS vector map data protection to store, transmit or distribute to authorized users. In proposed scheme, polylines and polygons in vector map are targets of selective encryption. We select the significant objects in polyline/polygon layer, and then they are encrypted by the key sets generated by using Chaotic map before changing them in DWT, DFT domain. Experimental results verified the proposed algorithm effectively and error in decryption is approximately zero.
Compar ison of Level Set-based Active Contour Models on Subcor tical Image Segmentation
Vongphachanh, Bouasone ; Choi, Heung-Kook ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 827~833
DOI : 10.9717/kmms.2015.18.7.827
In this paper, we have compared three level set-based active contour (LSAC) methods on inhomogeneous MR image segmentation which is known as an important role of brain diseases to diagnosis and treatment in early. MR image is often occurred a problem with similar intensities and weak boundaries which have been causing many segmentation methods. However, LSAC method could be able to segment the targets such as the level set based on the local image fitting energy, the local binary fitting energy, and local Gaussian distribution fitting energy. Our implemented and tested the subcortical image segmentations were the corpus callosum and hippocampus and finally demonstrated their effectiveness. Consequently, the level set based on local Gaussian distribution fitting energy has obtained the best model to accurate and robust for the subcortical image segmentation.
Construction of Composite Feature Vector Based on Discriminant Analysis for Face Recognition
Choi, Sang-Il ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 834~842
DOI : 10.9717/kmms.2015.18.7.834
We propose a method to construct composite feature vector based on discriminant analysis for face recognition. For this, we first extract the holistic- and local-features from whole face images and local images, which consist of the discriminant pixels, by using a discriminant feature extraction method. In order to utilize both advantages of holistic- and local-features, we evaluate the amount of the discriminative information in each feature and then construct a composite feature vector with only the features that contain a large amount of discriminative information. The experimental results for the FERET, CMU-PIE and Yale B databases show that the proposed composite feature vector has improvement of face recognition performance.
Noise Robust Document Image Binarization using Text Region Detection and Down Sampli
Jeong, Jinwook ; Jun, Kyungkoo ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 843~852
DOI : 10.9717/kmms.2015.18.7.843
Binarization of document images is a critical pre-processing step required for character recognition. Even though various research efforts have been devoted, the quality of binarization results largely depends on the noise amount and condition of images. We propose a new binarization method that combines Maximally Stable External Region(MSER) with down-sampling. Particularly, we propose to apply different threshold values for character regions, which turns out to be effective in reducing noise. Through a set of experiments on test images, we confirmed that the proposed method was superior to existing methods in reducing noise, while the increase of execution time is limited.
Cross-layered Video Information Sharing Method and Selective Retransmission Technique for The Efficient Video Streaming Services
Chung, Taewook ; Chung, Chulho ; Kim, Jaeseok ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 853~863
DOI : 10.9717/kmms.2015.18.7.853
In this paper, we proposed cross-layered approach of video codec and communication system for the efficient video streaming service. Conventional video streaming is served by divided system which consist of video codec layer and communication layer. Its disintegration causes the limitation of the performance of video streaming service. With the cross-layered design, each layer could share the information and the service is able to enhance the performance. And we proposed the selective retransmission method in communication system based on the cross-layered system that reflect the information of encoded video data. Selective retransmission method which consider the characteristics of video data improves the performance of video streaming services. We verified the proposed method with raw format full HD test sequence with H.264/AVC codec and MATLAB simulation. The simulation results show that the proposed method improves about 10% PSNR performance.
Study on the Obsolescence Forecasting Judgment of PV Systems adapted Micro-inverters
Park, Chan Khon ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 864~872
DOI : 10.9717/kmms.2015.18.7.864
The purpose of this study is to design the algorithm, Predictive Service Component - PSC, for forecasting and judging obsolescence of solar system that is implemented based on the micro-inverter. PSC proposed in this study is suitable for monitoring of distributed power generation systems. It provides a diagnosis functionality to detect failures and anomaly events. It also can determine the aging of PV systems. The conclusion of this study shows the research and development of this kind of integrated system using PSC will be needed more and varied in the near future.
A Study on Ontology Modeling for Weapon Parts Development Information
Jang, Woo Hyuk ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 873~885
DOI : 10.9717/kmms.2015.18.7.873
Today, It is difficult to search the various and numerous information efficiently. For this reason, Semantic Web emerged to provide searching services more easily through the structuring of a variety of unstructured format data and the definition of meaningful relationships between information. Especially, definition of relationship and meaning among resources is significant to share and infer related information. Ontology modeling plays just that role. Weapon parts development information is unstructured and dispersed all over. There are many difficulties in finding desired information, leading to getting improper outcomes. In this paper, we present an intuitive ontology model with weapon parts development information including the multi-dimensional information analysis and expansion of the relevant information. This study build up a ontology model through creating class and hierarchy about parts information and defining the properties of classes with Ontology Development 101 procedures using Protégé tools. The ontology model provides users with a platform on which search of needed information can be easy and efficient.
Inverse Model Parameter Estimation Based on Sensitivity Analysis for Improvement of PM
Yu, Suk Hyun ; Koo, Youn Seo ; Kwon, Hee Yong ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 886~894
DOI : 10.9717/kmms.2015.18.7.886
In this paper, we conduct sensitivity analysis of parameters used for inverse modeling in order to estimate the PM
emissions from the 16 areas in East Asia accurately. Parameters used in sensitivity analysis are R, the observational error covariance matrix, and B, a priori (background) error covariance matrix. In previous studies, it was used with the predetermined parameter empirically. Such a method, however, has difficulties in estimating an accurate emissions. Therefore, an automatically determining method for the most suitable value of R and B with an error measurement criteria and posteriori emissions accuracy is required. We determined the parameters through a sensitivity analysis, and improved the accuracy of posteriori emissions estimation. Inverse modeling methods used in the emissions estimation are pseudo inverse, NNLS (Nonnegative Least Square), and BA(Bayesian Approach). Pseudo inverse has a small error, but has negative values of emissions. In order to resolve the problem, NNLS is used. It has a unrealistic emissions, too. The problems are resolved with BA(Bayesian Approach). We showed the effectiveness and the accuracy of three methods through case studies.
A Study on Intimacy for Animation Character by the Intimacy Process －Focus on the Sternberg`s Triangular Theory of Love
Kim, Myeong Sam ;
Journal of Korea Multimedia Society, volume 18, issue 7, 2015, Pages 895~900
DOI : 10.9717/kmms.2015.18.7.895
This study is to identify the elements, the types and the degrees of intimacy for animation character by the intimacy process through viewer. Firstly it is identified the element of intimacy by 1)Viewing, 2)Purchasing, and 3)Visiting. And secondly utilizing the psychological theory that is the Sternberg`s triangular theory of love and then classifying the types and the degrees with the love to animation character in order to establishing the intimacy process. Finally it is considered mainly the type and the degree of intimacy by concept of completion and existence, the elements of intimacy are applied to 8 types of Sternberg`s triangular theory of love. Those 8 types were compounded by those three elements of love. The results of study said that type 1.2.3 are uncompleted and low of the intimacy level, and type 4.5.6 are also uncompleted and average of the intimacy level, type 7 is completed and high of the intimacy level, and finally type 8 is nothing and no level. And the degree of intimacy is to be revealed by the relative comparison. It was concluded that the three elements have to be equally effects to animation character for establishing the high level of intimacy.