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Optical Flow와 Normalized Cut을 이용한 2차원 동영상의 3차원 동영상 변환
정재현,박길배,김주환,강진모,이병호,Jung, Jae-Hyun,Park, Gil-Bae,Kim, Joo-Hwan,Kang, Jin-Mo,Lee, Byoung-Ho 한국광학회 2009 한국광학회지 Vol.20 No.1
본 논문에서는 2차원 동영상을 normalized cut과 optical flow를 이용하여 3차원 동영상으로 변환하는 방법을 제안하였다. 이를 통해 특정 디스플레이 장치와 특정 동영상 포맷에 국한되지 않는 2차원 동영상의 3차원 동영상 변환 방법을 제안하였다. 본 연구에서는 2차원 동영상의 3차원 변환을 위하여 먼저 영상을 객체로 분할하고, 분할된 객체의 깊이를 추정하는 방법을 사용하였다. Normalized cut은 영상분할의 한 방법으로, 본 연구에서는 연산속도 향상을 위하여 기존 방법에 watershed 알고리즘을 적용하였고, 정확도 향상을 위하여 가중치에 optical flow를 추가하였다. Normalized cut을 이용하여 분할된 영상의 깊이 정보를 추정하기 위하여 optical flow를 이용하였다. Optical flow의 차이를 통해 정의할 수 있는 가려진 영역의 분할 영상 변화를 통해 순서적 깊이 정보를 추정한다. 추정된 순서적 깊이를 보정하기 위해 optical flow의 절대적 크기를 이용해 운동시차로 상대적 깊이를 추정하였다. 최종적으로 추정된 깊이 정보는 순서적 깊이와 상대적 깊이의 곱을 평균 optical flow로 나누어, 순서적 깊이의 차이를 보정하였다. 제안한 방법의 검증을 위하여 2차원 동영상을 3차원 동영상으로 변환하여 깊이 정보가 추정됨을 확인하였다. We propose a method to convert a two-dimensional movie to a three-dimensional movie using normalized cut and optical flow. In this paper, we segment an image of a two-dimensional movie to objects first, and then estimate the depth of each object. Normalized cut is one of the image segmentation algorithms. For improving speed and accuracy of normalized cut, we used a watershed algorithm and a weight function using optical flow. We estimate the depth of objects which are segmented by improved normalized cut using optical flow. Ordinal depth is estimated by the change of the segmented object label in an occluded region which is the difference of absolute values of optical flow. For compensating ordinal depth, we generate the relational depth which is the absolute value of optical flow as motion parallax. A final depth map is determined by multiplying ordinal depth by relational depth, then dividing by average optical flow. In this research, we propose the two-dimensional/three-dimensional movie conversion method which is applicable to all three-dimensional display devices and all two-dimensional movie formats. We present experimental results using sample two-dimensional movies.
동역학 해석용 Air Spring Modeling 방법에 대한 고찰
성재호(Seong Jae-Ho),이강운(Lee Kang-Wun),박길배(Park Gil-Bae),양희주(Yang Hee-Joo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
To predict the dynamic behaviour of railway vehicle, the complex vehicle structure has been described by mathmatical model such as mass, spring and damper. Air-spring has played a major role to improve dynamic characteristics, vibration isolation and ride comfort. The mechanical behaviour of air spring is very complicated. The behaviour is based on fluid and thermodynamic mechanisms. The main parameters of air spring are stiffness due to compression of the air in the spring and surge reservoir, change of area stiffness and orifice damping. In this paper, we have studied an air-spring modeling method and compared the difference between calculation and test.
현가장치의 hysteresis를 고려한 Sway 특성 및 동적특성에 관한 연구
성재호(Seong Jae-Ho),이강운(Lee Kang-Wun),박길배(Park Gil-Bae),양희주(Yang Hee-Joo),우관제(Woo Kwan Je) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Suspensions of railway vehicle have played a major role to improve ride quality and safety of the vehicle. So it is important to use appropriate suspension elements which affect dynamic characteristics of the vehicle. Primary and secondary suspensions which include rubber element have the characteristics of hysteresis. To model the hysteresis spring in detail, it is necessary to use user subroutine with VAMPIREⓡ Pro. In this paper, Sway and dynamic characteristics of vehicle according to the hysteresis of suspensions were studied.
성재호(Seong Jae-Ho),이강운(Lee Kang-Wun),박길배(Park Gil-Bae),양희주(Yang Hee-Joo) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Generally railway vehicle runs on the rail with endless interaction between wheel and rail. Irregularity of rail causes the periodic motion of the vehicle. In association with this motion, the design of vehicle would be carried out in order to avoid the resonance between car-body and bogie. It may be seen that the first vertical bending mode of car-body contributes considerably to the vertical ride comfort level. In this paper to know the effect of the car-body first vertical bending mode on vertical ride comfort, the mode has been considered with dynamic model. I-DEAS program was used to get the car-body first vertical bending mode and VAMPIRE program was used to analyze ride comfort index(Wz) with FE interface file.
ADAMS/Rail과 ADAMS/Durability를 이용한 철도차량의 동응력 해석
조연호(Cho Yon-Ho),이강운(Lee Kang-wun),박길배(Park Gil-bae),최중호(Choi Jung-Ho) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Rotem has chosen ADAMS/Rail as the next generation analysis tool, to improve the capability and accuracy of the analysis ability. The dynamic performances of the railway vehicle, which is designed and manufactured by Rotem, have been analyzed and simulated using ADAMS/Rail. In this paper, Dynamic stress of bogie frame on running track is analyzed and compared with the data of real vehicle test. It is performed using ADAMS/AutoFlex and ADAMS/Durability.