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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 14, Issue 12 - Dec 2011
Volume 14, Issue 11 - Nov 2011
Volume 14, Issue 10 - Oct 2011
Volume 14, Issue 9 - Sep 2011
Volume 14, Issue 8 - Aug 2011
Volume 14, Issue 7 - Jul 2011
Volume 14, Issue 6 - Jun 2011
Volume 14, Issue 5 - May 2011
Volume 14, Issue 4 - Apr 2011
Volume 14, Issue 3 - Mar 2011
Volume 14, Issue 2 - Feb 2011
Volume 14, Issue 1 - Jan 2011
Selecting the target year
A Watermarking Scheme for Shapefile-Based GIS Digital Map Using Polyline Perimeter Distribution
Huo, Xiao-Jiao ; Lee, Suk-Hwan ; Kwon, Seong-Geun ; Moon, Kwan-Seok ; Kwon, Ki-Ryong ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 595~606
DOI : 10.9717/kmms.2011.14.5.595
This paper proposes a robust watermarking scheme for GIS digital map by using the geometric properties of polyline and polygon, which are the fundamental components in vector data structure. In the proposed scheme, we calculate the lengths and the perimeters of all polylines and polygons in a map and cluster them to a number of groups. Then we embed the binary watermark by changing the mean of lengths and perimeters in an embedding group. For improving the safety and robustness, we permute the binary watermark through PRNS(pseudo-random number sequence) processing and embed it repeatedly in a model. Experimental results verified that our scheme has a good invisibility, safety and robustness to various geometric attacks and also our scheme needs not the original map in the extracting process of watermark.
An Illumination and Background-Robust Hand Image Segmentation Method Based on the Dynamic Threshold Values
Na, Min-Young ; Kim, Hyun-Jung ; Kim, Tae-Young ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 607~613
DOI : 10.9717/kmms.2011.14.5.607
In this paper, we propose a hand image segmentation method using the dynamic threshold values on input images with various lighting and background attributes. First, a moving hand silhouette is extracted using the camera input difference images, Next, based on the R,G,B histogram analysis of the extracted hand silhouette area, the threshold interval for each R, G, and B is calculated on run-time. Finally, the hand area is segmented using the thresholding and then a morphology operation, a connected component analysis and a flood-fill operation are performed for the noise removal. Experimental results on various input images showed that our hand segmentation method provides high level of accuracy and relatively fast stable results without the need of the fixed threshold values. Proposed methods can be used in the user interface of mixed reality applications.
Design of a Wide Tuning Range DCO for Mobile-DTV Applications
Song, Sung-Gun ; Park, Sung-Mo ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 614~621
DOI : 10.9717/kmms.2011.14.5.614
This paper presents design of a wide tuning range digitally controlled oscillator(DCO) for Mobile-DTV applications. DCO is the key element of the ADPLL block that generates oscillation frequencies. We proposed a binary delay chain(BDC) structure, for wide tuning range DCO, modifying conventional fixed delay chain. The proposed structure generates oscillation frequencies by delay cell combination which has a variable delay time of
in the range of
. The BOC structure can reduce the number of delay cells because it make possible to select delay cell and resolution. We simulated the proposed DCO by Cadence's Spectre RF tool in 1.8V chartered
CMOS process. The simulation results showed 77MHz~2.07GHz frequency range and 3ps resolution. The phase noise yields -101dBc/Hz@1MHz at Mobile-DTV maximum frequency 1675MHz and the power consumption is 5.87mW. The proposed DCO satisfies Mobile-DTV standards such as ATSC-M/H, DVB-H, ISDB-T, T-DMB.
A Fast Adaptive Corner Detection Based on Curvature Scale Space
Nguyen, Van Hau ; Woo, Kyung-Haeng ; Choi, Won-Ho ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 622~631
DOI : 10.9717/kmms.2011.14.5.622
Corners play an important role in describing object features for pattern recognition and identification. This paper proposed a fast and adaptive corner detector in both coarse and fine scale, followed by the framework of the curvature scale space (CSS). An adaptive curvature threshold and evaluating of angles of corner candidates are added to original CSS to remove round corners and false corners in the detecting process. The efficiency of proposed method is compared to other popular detectors in both accuracy criteria, stability and time consuming. Results illustrate that the proposed method performs extremely surpass in both areas.
Wafer Position Recognition System Using Radial Shape Calibrator
Lee, Byeong-Guk ; Lee, Joon-Jae ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 632~641
DOI : 10.9717/kmms.2011.14.5.632
This paper presents a position error recognition system when the wafer is mounted in cleaning equipment among the wafer manufacturing processes. The proposed system is to enhance the performance in cost and reliability by preventing the wafer cleaning system from damaging by alerting it when it is put in correct position. The proposed algorithm is in obtaining a mapping function from camera and physical wafer by designing and manufacturing the radial shape calibrator to reduce the error by using the conventional chess board one. The system is to install in-line process using high reliable and high accurate position recognition. The experimental results show that the performance of the proposed system is better than that of the existing method for detecting errors within tolerance.
Mass-Spring-Damper Model for Offline Handwritten Character Distortion Analysis
Cho, Beom-Joon ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 642~649
DOI : 10.9717/kmms.2011.14.5.642
Among the various aspects of offline handwritten character patterns, it is the great variety of writing styles and variations that renders the task of computer recognition very hard. The immense variety of character shape has been recognized but rarely studied during the past decades of numerous research efforts. This paper tries to address the problem of measuring image distortions and handwritten character patterns with respect to reference patterns. This work is based on mass-spring mesh model with the introduction of simulated electric charge as a source of the external force that can aid decoding the shape distortion. Given an input image and a reference image, the charge is defined, and then the relaxation procedure goes to find the optimum configuration of shape or patterns of least potential. The relaxation process is based on the fourth order Runge-Kutta algorithm, well-known for numerical integration. The proposed method of modeling is rigorous mathematically and leads to interesting results. Additional feature of the method is the global affine transformation that helps analyzing distortion and finding a good match by removing a large scale linear disparity between two images.
A Visual Weighting-Based Bit Allocation Algorithm for H.264 Scalable Extension(SE)
Quan, Shan Guo ; Ha, Ho-Jin ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 650~657
DOI : 10.9717/kmms.2011.14.5.650
This paper proposes a novel bit allocation algorithm for H.264 scalable extension(SE) based on a human visual system (HVS) to improve the coding efficiency. The proposed algorithm is consist of two stages: visual weighting model and visual weighting-based bit allocation algorithm. In the first stage, the visual weighting for each macroblock (MB) is analyzed according to the region of interests. Then the adaptation of the visual weighting into the bit allocation routine for each quality layer is performed for improving the visual quality. In the simulation results, it is observed that the proposed scheme can improve the subjective and objective video quality in the same bit rate, compared to the previous scalable video coding in H.264.
A Study on Virtual Source-based Differentiated Multicast Routing and Wavelength Assignment Algorithms in the Next Generation Optical Internet based on DWDM Technology
Kim, Sung-Un ; Park, Seon-Yeong ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 658~668
DOI : 10.9717/kmms.2011.14.5.658
Over the past decade, the improvement of communications technologies and the rapid spread of www (World Wide Web) have brought on the exponential growth of users using Internet and real time multimedia multicast services like video conferencing, tele-immersive virtual reality, and Internet games. The dense-wavelength division multiplexing (DWDM) networks have been widely accepted as a promising approach to meet the ever-increasing bandwidth demands of Internet users, especially in next generation Internet backbone networks for nation-wide or global coverage. A major challenge in the next generation Internet backbone networks based on DWDM technologies is the resolution of the multicasting RWA (Routing and Wavelength Assignment) problem; given a set of wavelengths in the DWDM network, we set up light-paths by routing and assigning a wavelength for each connection so that the multicast connections are set-upped as many as possible. Finding such optimal multicast connections has been proven to be Non-deterministic Polynomial-time-complete. In this paper, we suggest a new heuristic multicast routing and wavelength assignment method for multicast sessions called DVS-PMIPMR (Differentiated Virtual Source-based Priority Minimum Interference Path Multicast Routing algorithm). We measured the performance of the proposed algorithm in terms of number of wavelength and wavelength channel. The simulation results demonstrate that DVS-PMIPMR algorithm is superior to previous multicast routing algorithms.
Parallel Range Query processing on R-tree with Graphics Processing Units
Yu, Bo-Seon ; Kim, Hyun-Duk ; Choi, Won-Ik ; Kwon, Dong-Seop ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 669~680
DOI : 10.9717/kmms.2011.14.5.669
R-trees are widely used in various areas such as geographical information systems, CAD systems and spatial databases in order to efficiently index multi-dimensional data. As data sets used in these areas grow in size and complexity, however, range query operations on R-tree are needed to be further faster to meet the area-specific constraints. To address this problem, there have been various research efforts to develop strategies for acceleration query processing on R-tree by using the buffer mechanism or parallelizing the query processing on R-tree through multiple disks and processors. As a part of the strategies, approaches which parallelize query processing on R-tree through Graphics Processor Units(GPUs) have been explored. The use of GPUs may guarantee improved performances resulting from faster calculations and reduced disk accesses but may cause additional overhead costs caused by high memory access latencies and low data exchange rate between GPUs and the CPU. In this paper, to address the overhead problems and to adapt GPUs efficiently, we propose a novel approach which uses a GPU as a buffer to parallelize query processing on R-tree. The use of buffer algorithm can give improved performance by reducing the number of disk access and maximizing coalesced memory access resulting in minimizing GPU memory access latencies. Through the extensive performance studies, we observed that the proposed approach achieved up to 5 times higher query performance than the original CPU-based R-trees.
Design and Implementation of the GNEX-to-iPhone Converter for Smart Phone Game Contents
Lee, Yang-Sun ; Kim, Jae-Sung ; Kim, Myoung-Jin ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 681~690
DOI : 10.9717/kmms.2011.14.5.681
Since korean mobile communication companies each use different mobile platforms, developers must configure and translate their game contents to run under each of the smart phone platforms so that they can be serviced correctly. Nevertheless, such translation tasks require lengthy times and costs. This is one of the reasons why a variety of contents could not be provided. In order to mitigate such difficulty, this paper implemented the contents analyzer and the resource converter of the automatic mobile contents converter system that converts game contents of the mobile platform such as the WIPI and the GNEX to contents of the smart platform such as the Android and the iOS. The automatic mobile contents converter system helps minimize the amount of time and cost required in servicing contents to different mobile communication companies by promptly converting platform-specific-contents to run under smart platforms. Also, the automatic conversion and servicing of existing contents increases the reusability of these contents and also the productivity of new contents thereby offering users with a more variety of game contents.
Correlation Analysis between Artists' Shading and CG Shading
Byun, Hae-Won ; Park, Yoon-Young ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 691~702
DOI : 10.9717/kmms.2011.14.5.691
Recently, several researchers have attempted to combine human visual perception and computer graphics. Cole et. al. suggest the study results in which line drawing algorithm in computer graphics characterize the properties of line drawing made by artists. The paper also evaluates CG line drawing algorithms depending on whether people recognize effectively specific 3D shape from the image made by those CG line drawing algorithms. However, human recognizes the shape of objects more effectively in image made by BRDF shading model than line drawing algorithm. It means that the shading factor is important to recognize shape with human perception. In this paper, we analyze the correlation between shading made by human artists and that made by CG shading algorithms. The study is to characterize the mathematical properties of artists' shading and CG shading. This type of analysis can guide the future development of new CG shading algorithm in computer graphics for the purpose of shape perception.
A Study on the Convergence of Monitoring and Control System with Geographic Information System
Seo, Tae-Woong ; Kim, Chang-Soo ; Lee, Jae-Sung ; Lee, Cheol-Won ;
Journal of Korea Multimedia Society, volume 14, issue 5, 2011, Pages 703~709
DOI : 10.9717/kmms.2011.14.5.703
State-based infrastructure on IT-based network are prone to numerous cyber attack including subsequent hacking and internet infringement. These acts of terrorism are increasing because of the expanding IT convergence technology. Recently, the trend on cyber security monitoring and control researches focus on combining the general idea of security monitoring and control along with IT field and other control systems. This convergence trend has been increasing in both the use and importance. This research analyzes the state-based infrastructure monitoring and control system, its vulnerability as well as its improvement by incorporating the cyber convergence systems to existing systems. The subject of this research is for extensive use of CCTV systems which is expanded for 'CCTV Monitoring and Control Field' as well as 'Traffic Monitoring and Control Field' operated by 'Intelligent Traffic Information System' and Disaster Management Area which is studied in various fields. Eventually, the objective of the paper is to solve these issues, to apply related systems and to suggest improvement on the convergence system.