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Stereo Matching by Dynamic Programming Involving Occlusion and Local Bias
Du-Yeong Jung,Sang-Youp Park,Ju-Hyun Oh,Chang-Soon Kang,Ki-Gon Nam 한국정보과학회 1998 Journal of Electrical Engineering and Information Vol.3 No.6
This paper presents an approach to stereo matching which uses the difference of gradient obtained from the intensity values on each epipolar line of two stereo images. Dynamic programming which uses the difference of gradient as cost function resolves local bias problem arising when stereo images are taken, and depth discontinuity problem arising at occlusion regions. The algorithm shows good experimental results and short computation time when applied to various test images.
Stereo Matching by Discontinuity-Preserving Regularization
Du-Yeong Jung,Ju-Hyun Oh,Sang-Chan Lee,Chul-Hun Lee,Ki-Gon Nam 한국정보과학회 1999 Journal of Electrical Engineering and Information Vol.4 No.4
To extract 3D information, such as disparity and depth from stereo images, is mathematically an ill-posed problem. To overcome this problem, and to obtain a disparity map, regularization is applied. The addition of the smoothness assumption to solve this problem leads to an undesirable blurring of the disparity map across discontinuities. The discontinuities in the disparity map can be preserved by using a controlled-continuity stabilizer if the discontinuity information is known in advance, which is generally not possible. In order to obtain the discontinuity information, this paper focuses on the fact that the disparity map obtained by regularization has high-energy distribution at the discontinuities. Once the disparity map is obtained, it is used as the initial condition for the discontinuity information needed for the next discontinuity-preserving regularization. The algorithm has been tested on several stereo images and the results have shown that the blurring of disparities across discontinuities is drastically reduced.
제5차 대한간학회 춘계학술대회 초록집 : 포스터 전시 순서 ; 간농양의 임상양상을 보인 간의 원발성 선편평상피암종 1예
이영두 ( Lee Yeong Du ),조창민 ( Jo Chang Min ),김대현 ( Kim Dae Hyeon ),김현수 ( Kim Hyeon Su ),권중구 ( Kwon Jung Gu ),탁원영 ( Tag Won Yeong ),권영오 ( Kwon Yeong O ),김성국 ( Kim Seong Gug ),최용환 ( Choe Yong Hwan ),정준모 ( 대한간학회 1999 Clinical and Molecular Hepatology(대한간학회지) Vol.5 No.1(S)
3-D Hermite 다항식을 사용한 영상속도 벡터 추정 알고리즘에 관한 연구
정두영 거제전문대학 1998 論文集 Vol.6 No.-
Traditional optical flow algorithms assume local image transnational motion and apply simple filtering techniques. Recent studies have taken the application of spatio-temporal filtering schemes and the use of advanced motion models. Under perspective projection, This taper presents implementation of a motion algorithm and an image motion equation that the describes the spatio-temporal relation of intensity in an image sequences. In this paper, Using Hermite Polynomials, design differentiation filters and The resulting algorithm produces optical flow and other useful motion parameters.
정두영 거제전문대학 1997 論文集 Vol.5 No.-
This paper presents a fast estimation algorithm of the optical flow by using the multilevel pyramid structure. The proposed algorithm is based on the block matching methods. This algorithm can reduce greatly the computational complexity of the conventional BMAs (Three Step Search, Direction of Minimum Distortion). Computer simulation shows that the proposed algorithm is fast & good performance efficiency in terms of PSNR.
정두영 거제전문대학 1999 論文集 Vol.8 No.-
This paper presents a stereo matching using Energy-Based Method. The Energy-based Method consists of expressing the correspondence problems as a minimization and regularization one. The computation of stereo disparity is a mathematically ill-posed problem. To overcome the ill-posed problems, Regularization theory provides an approach to make the problem well-posed by imposing additional constraints on the solution. An iterative solution of the discrete version of the associated Euler-Lagrange equation is then used in order to estimate disparity. Once the disparity map is obtained, it is used as the initial condition for the discontinuity information needed for the next discontinuity-preserving regularization.
정두영 거제전문대학 1998 論文集 Vol.7 No.-
This paper presents a stereo matching method using the dynamic programming. The dynamic programming is to find a global minimum path from starting point to ending point. The computation of cost in dynamic programming uses the difference of gradient. The stereo algorithm have had problems at occlusion regions. But the difference of gradient uses the information of occlusion regions as cues for depth discontinuities and adapts well this occlusion problem. This paper has been tested with different types of images. The experimental result is good and the computational time is fast.
단일기관 40세 이하 병원 직원에서의 IgG Anti-HAV 항체 양성률
노두영 ( Du Young Noh ),조용찬 ( Yong Chan Cho ),전원정 ( Won Jung Jun ),김성균 ( Sung Kyun Kim ),윤경원 ( Kyoung Won Yun ),박선영 ( Seon Young Park ),이완식 ( Wan Sik Lee ),주영은 ( Yeong Eun Ju ),김현수 ( Hyun Soo Kim ),최성규 ( 대한소화기학회 2010 대한소화기학회지 Vol.55 No.3
목적: A형 간염은 경구감염으로 전파되는 급성 감염 질환이다. 최근 A형 간염의 발병률이 광주 전남지역에서 증가함에 따라 전남대학교병원 직원에서도 A형 간염 발생이 증가하였다. 이에 A형 간염에 대한 위험도를 평가하기 위해 전남대학교병원에서 근무하는 40세 이하 직원에서의 IgG anti-HAV 항체 양성률을 조사하였다. 대상 및 방법: 2008년 7월부터 2008년 8월까지 전남대학교병원에서 근무하는 40세 이하의 직원 1,486명 중 1,002명(남성 190명, 여성 812명)에서 IgG anti-HAV 검사를 시행하였다. 연령대를 5세 간격으로 분류하였으며, 21-25세 199명(19.9%), 26-30세 426명(42.5%), 31-35세 215명(21.5%), 36-40세 162명(16.1%)이었다. 결과: IgG anti-HAV 양성은 1,002명 중 329명으로 항체 양성률은 32.8%였으며, 성별 항체 양성률은 남성 40.5%(77/190), 여성 31.0% (252/812)였다. 각 연령대별 항체 양성률은 21-25세 1.5%(3/199), 26-30세 21.4%(92/426), 31-35세 48.4%(104/215), 36-40세 80.2%(130/162)였다. 직접 환자와 접촉하는 직종(의사, 간호사, 보건기사)에서의 IgG anti-HAV 양성률은 28.9%(234/809)였으며, 20대 초반 21-25세 1.7%(3/176), 26-30세 20.7%(78/376), 31-35세 45.5%(71/156), 36-40세 81.2%(82/101)였다. 결론: 20대 초반 병원 직원에서 IgG anti-HAV 보유율이 가장 낮았으며, 연령대가 증가할수록 항체 보유율이 높았으나 30대 초반까지는 항체 보유율이 50% 이하였다. 따라서 A형 간염 환자와 직접 접촉할 수 있는 30대 초반 이하의 병원 직원에서는 A형 간염 백신의 접종이 필요하리라 생각한다. Background/Aims: Hepatitis A is an acute infectious disease transmitted by fecal-oral route. As the incidence of hepatitis A has been increased in Gwangju and Chonnam province of Korea recently, the number of hepatitis A patients in hospital employees has also increased. Thus, we investigated the seroprevalence of IgG anti-HAV in hospital employees below 40 years old. Methods: We analysed the seroprevalence of anti-HAV IgG from 1,002 Chonnam national university hospital empolyees (men: 190, women: 812) who were below 40 years old. The age group was divided by 5 years; 21-25 years old 199 (19.9%), 26-30 years old 426 (42.5%), 31-35 years old 215 (21.5%), 36-40 years old 162 (16.1%). Results: Overall seropositive rate of IgG anti-HAV was 32.8% (329/1,002). The seropositive rate of men was 40.5% (77/190) and that of women was 31.0% (252/812). The seropositive rates of each age group were 1.5% (3/199) in 21-25 years old, 21.6% (92/426) in 26-30 years old, 48.4% (104/215) in 31-35 years old, and 80.2% (130/162) in 36-40 years old. The seropositivity rate of the high risk group (doctors, nurses, technicians) was 28.9% (234/809). Conclusions: The seropositive rate of IgG anti- HAV was the lowest in early twenties of hospital employees and below 50% in early thirties. Therefore, hepatitis A vaccination may be warranted in the hospital empolyees below the early thirties. (Korean J Gastroenterol 2010;55:183-188)