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이정엄(Jeong-Eom Lee),이석주(Seok-Joo Lee),박귀태(Gwi- Tae Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For a vision-based occupant s pose recognition system, this paper presents a new algorithm that can detect the head of the car occupant. Head detection is necessary for occupant's pose recognition in the car, since the position of occupant's head provides valuable information, such as his pose, size, position, and so on. We use the head-shoulder models and support vector machines. Given the variable illumination conditions within the car, the color information for detecting the head (or face) is not sufficient. Our method is based upon using only the grey image, since the infrared illumination could be utilized in the night. Although it is known that SVM could be useful for detection the face, such method can be slower when the size of the training set images is increased to cover diverse pose and size variation of the face. Since the contours in our study are lighter than the conventional face images in terms of SVM processing, it fits to the embedded system installed in the car. Results suggest that the head-shoulder contour model and support vector machines for detection the occupant's head could find a few useful applications.
위상차 현미경 영상 내 푸리에 묘사자를 이용한 암세포 형태별 분류
강미선,이정엄,김혜련,김명희,Kang, Mi-Sun,Lee, Jeong-Eom,Kim, Hye-Ryun,Kim, Myoung-Hee 대한의용생체공학회 2012 의공학회지 Vol.33 No.4
Tumor cell morphology is closely related to its migratory behaviors. An active tumor cell has a highly irregular shape, whereas a spherical cell is inactive. Thus, quantitative analysis of cell features is crucial to determine tumor malignancy or to test the efficacy of anticancer treatment. We use 3D time-lapse phase-contrast microscopy to analyze single cell morphology because it enables to observe long-term activity of living cells without photobleaching and phototoxicity, which is common in other fluorescence-labeled microscopy. Despite this advantage, there are image-level drawbacks to phase-contrast microscopy, such as local light effect and contrast interference ring. Therefore, we first corrected for non-uniform illumination artifacts and then we use intensity distribution information to detect cell boundary. In phase contrast microscopy image, cell is normally appeared as dark region surrounded by bright halo ring. Due to halo artifact is minimal around the cell body and has non-symmetric diffusion pattern, we calculate cross sectional plane which intersects center of each cell and orthogonal to first principal axis. Then, we extract dark cell region by analyzing intensity profile curve considering local bright peak as halo area. Finally, we calculated the Fourier descriptor that morphological characteristics of cell to classify tumor cells into active and inactive groups. We validated classification accuracy by comparing our findings with manually obtained results.
가속도 센서 기반의 신체 부착형 플랫폼을 이용한 운동 인식
김주형(Joo-Hyung Kim),이정엄(Jeong-Eom Lee),박용찬(Yong-Chan Park),김대환(Daehwan Kim),박귀태(Gwi-Tae Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.11
u-Healthcare service is one of attractive applications in ubiquitous environment. In this paper, we propose a method to recognize exercises using a new accelerometer based body-attached platform for supporting u-Healthcare service. The platform consists of a device for measuring accelerometer data and a device for receiving the data. The former measures a user's motion data using a 3-axis accelerometer. The latter transmits the accelerometer data to a computer for recognizing the user's exercise. The algorithm for exercise recognition classifies the type of exercise using principle components analysis(PCA) from the accelerometer data transformed by discrete fourier transform(DFT), and estimates the repetition count of the recognized exercise using a peak detection algorithm. We evaluate the performance of the algorithm from the accuracy of the recognition of exercise type and the error rate of the estimation of repetition count. In our experimental result, the algorithm shows the accuracy about 98%.
능동적 정보 디스플레이를 위해 프로젝터와 투영면간의 변환관계를 이용한 일정한 크기의 영상투영
안재현(Jae-Hyun Ahn),이정엄(Jeong-Eom Lee),김주형(Joo-Hyung Kim),박귀태(Gwi-Tae Park) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2B
프로젝터가 탑재된 이동로봇을 이용하여 사용자가 바라보는 곳에 시각정보를 투영하는 능동형 정보 디스플레이 시스템을 소개하고 시각정보를 투영해야 하는 위치가 변하더라도 일정한 시각정보를 투영하기 위한 방법을 제안한다. 본 논문의 정보 디스플레이 시스템은 pan-tilt 제어가 가능한 거울을 이용하여 이동 로봇에 탑재된 프로젝터의 투영 영상을 사용자가 바라보는 곳이 어디든지 시각정보를 전달할 수 있다. 하지만 투영 기반의 시스템이므로 투영각 변화에 따른 왜곡 보정이 필요하다. 본 논문에서는 거울의 pan-tilt 각도 변화에 따라 투영된 영상이 어떻게 변하는지를 분석하여 왜곡을 보정하고 거울의 pan-tilt 각도 변화에도 일정한 영상이 투영됨을 실험을 통하여 확인하고자 한다.