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임베디드 GPU에서의 병렬처리를 이용한 모바일 기기에서의 다중뷰 스테레오 정합
전윤배,박인규 한국방송∙미디어공학회 2019 방송공학회논문지 Vol.24 No.6
Multiview stereo matching algorithm is used to reconstruct 3D shape from a set of 2D images. Conventional multiview stereo algorithms have been implemented on high-performance hardware due to the heavy complexity that contains a large number of calculations in each step. However, as the performance of mobile graphics processors has recently increased rapidly, complex computer vision algorithms can now be implemented on mobile devices like a smartphone and an embedded board. In this paper we parallelize an multiview stereo algorithm using OpenCL on mobile GPU and provide various optimization techniques on the embedded hardware with limited resource.
AN EFFICIENT SECOND-ORDER NON-ITERATIVE FINITE DIFFERENCE SCHEME FOR HYPERBOLIC TELEGRAPH EQUATIONS
전윤배,황홍택 한국수학교육학회 2010 純粹 및 應用數學 Vol.17 No.4
In this paper, we propose a second-order prediction/correction (SPC)domain decomposition method for solving one dimensional linear hyperbolic partial di®erential equation utt +a(x; t)ut +b(x; t)u = c(x; t)uxx +f(x; t). The method can be applied to variable coe±cients problems and singular problems. Unconditional stability and error analysis of the method have been carried out. Numerical results support stability and e±ciency of the method.
NON-OVERLAPPING RECTANGULAR DOMAIN DECOMPOSITION METHOD FOR TWO-DIMENSIONAL TELEGRAPH EQUATIONS
전윤배 영남수학회 2023 East Asian mathematical journal Vol.39 No.1
In this paper, a non-overlapping rectangular domain decom- position method is presented in order to numerically solve two-dimensional telegraph equations. The method is unconditionally stable and efficient. Spectral radius of the iteration matrix and convergence rate of the method are provided theoretically and confirmed numerically by MATLAB. Nu- merical experiments of examples are compared with several methods.
Handcrafted Cost 기반의 다중뷰 스테레오 정합 네트워크
전윤배,정태현,박인규 대한전자공학회 2022 전자공학회논문지 Vol.59 No.8
다중 뷰 스테레오 정합 기법은 임의의 화각에서 취득한 여러 장의 입력 영상으로부터 카메라 위치 정보를 활용하여 정교한 깊이 정보를 얻는 방법을 뜻한다. 기존 다중 뷰 스테레오 정합 기법은 인접 영상 간 가려진영역이 적을 때만 잘 작동하며 영상 내 잡음에 취약한 모습을 보였다. 본 논문에서는 소수의 입력 영상으로부터 CNN 기반의 encoder-decoder 구조의 네트워크로 정교한 깊이 영상을 복원하는 기법을 제안한다. 제안하는 기법은 비용 볼륨 구축 알고리즘과 대상 영상에 대한 올바른 참조 영상 선정 기법 그리고 비용 볼륨 regression 네트워크를 통한 변이도 추정 기법으로 구성되어있다. 본 논문에서는 제안하는 기법들을 통해 저 사양 임베디드 보드에서 OpenCL 기반의 병렬 알고리즘으로 다중 뷰 스테레오 정합의 구현 가능성을 보이고, 다중 영상 데이터 셋으로 학습한 네트워크를 통해 소수의 영상으로부터 정교한 깊이 정보를 복원한다.
AN ACCELERATING SCHEME OF CONVERGENCE TO SOLVE FUZZY NON-LINEAR EQUATIONS
전윤배 한국수학교육학회 2017 純粹 및 應用數學 Vol.24 No.1
In this paper, we propose an accelerating scheme of convergence of numerical solutions of fuzzy non-linear equations. Numerical experiments show that the new method has signi¯cant acceleration of convergence of solutions of fuzzy non- linear equation. Three-dimensional graphical representation of fuzzy solutions is also provided as a reference of visual convergence of the solution sequence.
Efficiency Analysis of a Domain Decomposition Method for the Two-dimensional Telegraph Equations
전윤배 영남수학회 2021 East Asian mathematical journal Vol.37 No.3
In this paper, we analyze the efficiency of a domain decomposition method for the two-dimensional telegraph equations. We formulate the theoretical spectral radius of the iteration matrix generated by the domain decomposition method, because the rate of convergence of an iterative algorithm depends on the spectral radius of the iteration matrix. The theoretical spectral radius is confirmed by the experimental one using MATLAB. Speedup and operation ratio of the domain decomposition method are also compared as the two measurements of the efficiency of the method. Numerical results support the high efficiency of the domain decomposition method.
Numerical methods for Fuzzy system of linear equations with crisp coefficient
전윤배 한국수학교육학회 2020 純粹 및 應用數學 Vol.27 No.1
In this paper, numerical algorithms for solving fuzzy system of linear equations with crisp coefficients are presented. We illustrate the efficiency and accuracy of the proposed methods by solving some numerical examples. We also provide graphical representation of the fuzzy solutions in three-dimension as a visual reference of the solution of the fuzzy system.
A NUMERICAL METHOD OF FUZZY DIFFERENTIAL EQUATIONS
전윤배 한국수학교육학회 2017 純粹 및 應用數學 Vol.24 No.3
In this paper, we propose a numerical method to solve fuzzy differential equations. Numerical experiments show that when the step size is small, the new method has significantly good approximate solutions of fuzzy differential equation. Graphical representation of fuzzy solutions in three-dimension is also provided as a reference of visual convergence of the solution sequence.