• Journal of Korea Multimedia Society
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• v.10 no.7
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• pp.838-845
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• 2007

In this paper, we propose a modified cubic convolution scaler for the enlargement or reduction of digital images. The proposed method has less computational complexity than the cubic convolution method. In order to reduce the computational complexity, we use the linear function of the cubic convolution and the difference value of adjacent pixels for selecting interpolation methods. We employ adders and barrel shifts to calculate weights of the proposed method. The proposed method is compared with the conventional one for the computational complexity and the image quality. It has been designed and verified by HDL(Hardware Description Language), and synthesized using Xilinx Virtex FPGA.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.3
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• pp.112-118
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• 2014

As higher quality of image is required for digital image scaling, longer processing time is required. Therefore the technology that can make higher quality image quickly is needed. We propose the double linear-cubic convolution interpolation which creates the high quality image with low complexity and hardware resources. The proposed interpolation methods which are made up of four one-dimensional linear interpolations and one one-dimensional cubic convolution perform linear-cubic convolution interpolation in horizontal and vertical direction. When compared in aspects of peak signal-to-noise ratio(PSNR), performance time and amount of hardware resources, the proposed interpolation provided better PSNR, low complexity and less hardware resources than bicubic convolution interpolation.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.203-207
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• 2007

본 논문에서는 낮은 해상도의 영상을 높은 해상도의 영상으로 변환하는 과정에서 최적화된 매개변수를 적용하는 적응적 3차 회선 보간 기법을 제안한다. 제안된 알고리즘은 먼저 주어진 영상 신호에 3차 회선 보간 기법을 수행하여 높은 해상도로 변환시킨다. 변환된 영상 신호는 다시 3차 회선 보간 기법으로 변환 과정을 통해 처음 주어진 원 영상 신호와 같은 해상도로 변환시킨다. 여기서 변환된 영상 신호와 원 영상 신호의 차이를 최소로 만드는 매개변수는 적응적으로 최적화된다. 적응적으로 최적화된 매개변수는 보간 커널을 최적화하여 3차 회선 보간 기법의 성능을 향상시킨다. 본 논문에서 제안한 알고리즘을 알려진 여러 영상으로 기존에 존재하던 보간 기법들과 비교하는 실험을 하고, 도출된 실험 결과를 객관적인 지표로 제시하여 우수함을 입증한다.

• Journal of the Korea Society of Computer and Information
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• v.13 no.6
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• pp.163-171
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• 2008

In this paper, we present an adaptive parametric cubic convolution technique in order to enlarge the low resolution image to the high resolution image. The proposed method consists of two steps. During the first interpolation step, we acquire adaptive parameters in introducing a new cost-function to reflect frequency properties. And, the second interpolation step performs cubic convolution by applying the parameters obtained from the first step. The enhanced interpolation kernel using adaptive parameters produces output image better than the conventional one using a fixed parameter. Experimental results show that the proposed method can not only provides the performances of $0.5{\sim}4dB$ improvements in terms of PSNR, but also exhibit better edge preservation ability and original image similarity than conventional methods in the enlarged images.

• The Journal of Korean Association of Computer Education
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• v.11 no.5
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• pp.57-66
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• 2008

An adaptive optimization of parametric cubic convolution for image interpolation is derived in this paper. The proposed technique is based on optimizing the standard cubic convolution interpolation formula at each interpolated pixel. Conventional parametric cubic convolution methods use a fixed parameter in an image, so properties of each pixel cannot be incorporated into the interpolation. The proposed method optimizes the interpolation kernel by obtaining parameters adaptively on each pixel. A new cost function is introduced to reflect frequency properties of the original data. The proposed technique produces noticeably sharper edges than traditional techniques and exhibits an average PSNR improvement of traditional techniques.

• Journal of Industrial Technology
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• v.28 no.A
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• pp.27-34
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• 2008

The purpose of this paper is an adaptive image interpolation using parametric cubic convolution. Proposed method derive parameter of adapting the frequency from adjacent values. The parameter optimize the interpolation kernel of cubic convolution. Simulation results show that the proposed method is superior to the conventional method in terms of the subjective and objective image quality.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.1 no.2
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• pp.107-122
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• 2008

Communication is be classified into public network and private network. VPN is made by integrating the circuit cost reduction of public network and the reliable security support of public network. This paper analyzes the IPSec using three layer tunneling, MPLS(Multi Protocol Label Switching) integrating 2 layer switching and 3 layer routing techniques and dedicated line from the viewpoint of security. In conclusion, VPN is better than dedicated network line in cost and security. If IPSec VPN is compared with MPLS VPN, MPLS VPN is more excellent than IPSec VPN in safe data transmission, cost, QoS and management.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.607-610
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• 2005

무선랜은 유선랜의 대안으로 개발되어 설비의 용이성으로 인하여 특수분야와 특수용도로만 이용되어오다가 최근 들어 그 표준과 기술이 급속도로 발전하여 현재는 건물간의 중계회선 또는 광범위의 유저들을 위한 일대일 통신등의 수단과 고속인터넷의 중계회선, 그리고 멀티미디어 대폭을 요구하는 화상통신의 수단으로 이용되고 있다. 개발당시 10Mbps의 전송속도에서 시작하여 최근에는 100Mbps 대역까지 확장되어가고 있는 추세이다. 특히 캠퍼스무선랜의 경우 인터넷 중계회선으로서 체감적으로 차이는 있지만 최소 10Mbps속도로 반경 100~200m 범위를 보장하여야한다고 사료된다. 본 논문에서는 실제이용환경에서 무선랜이 인터넷 중계회선으로서의 효용성입증을 위하여 측정하였다. 측정한 결과 IEEE802.11b 를 기반으로 네트워크를 구성하는 경우 최소 3개 이상의 AP로서 구성하여야한다는 것을 입증하였다. 향후 해양환경에서의 무선랜의 성능평가를 수행함에 그목적이 있다.

• 정보화사회
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• s.16
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• pp.36-37
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• 1989

1985년 1월 1일 정보통신역무제공업이 허용된 이래 지금까지 그룹전산망 특례인정, 공동사용범위 확대.타인사용 특례인정.다중화장치 등의 사용허용 등 3차에 걸친 회선사용 완화조치가 취해지면서 우리나라도 본격 민간VAN시대를 예고하며 고도정보화사회의 기반다지기에 매진하고 있다. 그러나 급속한 기술발전과 사회적 환경의 변화에 부합할 수 있는 제도의 미비와 관련조항에 대한 공중통신사업자와 업계의 의견이 달라 문제로 지적되왔고 업계는 업계대로 추진사업에 애로를 겪고 있다. 본 협회는 회원사로부터 관련조항에 대한 유권해석 및 제도개선의 요청을 받아 법제위원회를 개최했고 동위원회에서 토의된 내용을 지난달 2일 정부에 건의했다. 여기에 주요 내용을 게재한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.4
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• pp.753-757
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• 2005

Wireless LAN was developed by alternative of LAN and because establishment was easy, have used into special field and special expenditure. Recently, Standard and a technology developed by leaps and bounds. Present is used into purpose of the Building to Building or wide connection etc. and relay of the high speed Internet and usage of picture communication that require multimedia band width. Specially, campus wireless LAM is thought that must secure radius $100\;\~\;200\;m$ dimension at the minimum 10Mbps speed as Internet transit trunk. But, there is difference as degressive here. In this paper, wireless LAN measured for effectiveness proof as Internet transit trunk in actuality utilization environment. Proved that should compose IEEE802.11b as AP more than minimum 3 when compose network to base as measuring result. Hereafter, there is the purpose that achieve performance evaluation of wireless UM in marine environment.