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다수의 Kinect 카메라를 이용한 3차원 객체 복원 구현
신동원,호요성,Shin, Dong Won,Ho, Yo Sung 한국스마트미디어학회 2014 스마트미디어저널 Vol.3 No.4
3차원 복원은 실세계에 존재하는 물체를 가상의 공간에 재건하고 자유로운 시점을 선택하여 물체를 관찰할 수 있게 한다. 이러한 3차원 복원 기술은 교육, 문화, 예술 등 분야를 막론하고 다양한 곳에서 사용되고 있다. 3차원 복원 시스템을 구현하기 위해 본 논문에서는 Microsoft사에서 출시된 Kinect를 이용하여 다시점 시스템을 구성해서 고품질의 3차원 객체를 복원하는 방법을 제안한다. 먼저 3대의 Kinect를 객체의 전면에 수렴형으로 설치하여 색상 영상과 깊이 영상을 획득한다. 그런데 원본의 깊이 영상은 깊이 값을 가지지 않는 부분이 존재한다. 따라서 본 논문에서는 이 부분을 적절한 깊이 값으로 채워 넣기 위해서 깊이 가중치를 추가한 결합형 양방향 필터를 적용한다. 또한 다시점 시스템에서 얻은 원본의 색상 영상은 서로 색상이 일치하지 않는 문제가 존재하는데 이를 그대로 이용하여 3차원 모델 정합을 하면 색상이 부자연스럽게 연결된 3차원 모델을 얻게 된다. 따라서 이러한 색상 불일치의 문제를 해결하기 위해서 본 논문에서는 다시점 시스템에서의 3차원 기하학적 정보를 이용한 색상 보정 방법을 사용한다. 실험을 통해 제안한 방법을 이용하여 획득한 3차원 모델이 원본 3차원 모델보다 색상과 형태 관점에서 자연스럽게 표현된 것을 확인할 수 있었다. Three-dimensional image reconstruction allows us to represent real objects in the virtual space and observe the objects at arbitrary view points. This technique can be used in various application areas such as education, culture, and art. In this paper, we propose an implementation method of the high-quality three-dimensional object using multiple Kinect cameras released from Microsoft. First, We acquire color and depth images from triple Kinect cameras; Kinect cameras are placed in front of the object as a convergence form. Because original depth image includes some areas where have no depth values, we employ joint bilateral filter to refine these areas. In addition to the depth image problem, there is an color mismatch problem in color images of multiview system. In order to solve it, we exploit an color correction method using three-dimensional geometry. Through the experimental results, we found that three-dimensional object which is used the proposed method is more naturally represented than the original three-dimensional object in terms of the color and shape.
Design of Cubic Spline Interpolator using a PVAJT Motion Planner
신동원(Dong-Won Shin) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.3
A cubic spline trajectory planner with arc-length parameter is formulated with estimation by summing up to the 3rd order in Taylor’s expansion. The PVAJT motion planning is presented to reduce trajectory calculation time at every cycle time of servo control loop so that it is able to generate cubic spline trajectory in real time. This method can be used to more complex spline trajectory. Several case studies are executed with different values of cycle time and sampling time, and showed the advantages of the PVAJT motion planner. A DSP-based motion controller is designed to implement the PVAJT motion planning.
신동원(Dong-Won Shin) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.3
The FPCs(Flexible Printed Circuit) are currently used ill several electronic products like digital cameras, cellular phones because of flexible material characteristics. Because the FPC is usually small size and flexible, only one FPC should not enter chip mounting process, instead, several FPCs are placed on the large rigid pallette and enter into the chip mounting process. Currently the job of mounting FPC on the pallette is carried by totally manual way. Thus, the goals of the research is develop the automatic machine of FPC mounting on pallette using vision alignment. Instead of using two cameras or using moving one camera, the proposed vision system with only one fixed camera is adopted. Moreover, the two picker heads which can handle two FPCs simultaneously are used to make process time shortened. The procedure of operation is firstly to measure alignment error of FPC, correct alignment errors, and finally mount well-aligned FPC on the pallette. The vision technology is used to measure alignment error accurately, and precision motion control is used in correcting errors and mounting FPC.
전이성 병소에 의해 발생한 급성 충수염의 천공으로 진단된 전신병기 소세포폐암
신동원 ( Dong Won Shin ),최문한 ( Moon Han Choi ),박승식 ( Seung Sik Park ),박성우 ( Sung Woo Park ),김기업 ( Ki Up Kim ),장안수 ( An Soo Jang ),박춘식 ( Choon Sik Park ),임철완 ( Cheol Wan Lim ),고은석 ( Eun Suk Ko ),백상현 ( San 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.65 No.3
The incidence of appendiceal metastatic cancer is quite low. In particular, in small cell lung cancer, there is a very low incidence of a metastasis to the appendix. A 75-years old man with right lower quadrant pain, cough and sputum was transferred to our hospital. Abdominal CT revealed acute appendicitis with a perforation. The patient underwent surgery. The frozen sections of the tissue obtained during surgery, indicated a malignancy, but a right hemicolectomy was not performed due to the patient`s poor general condition. The histology findings of the appendix were identified as a small cell carcinoma. The abdominal CT scan and chest x-ray at admission day showed a mass in the right lower lobe, and a further evaluation of the lesion was performed including positron emission tomography and flexible bronchoscopy with a biopsy. The pathology findings of the lung mass were also small cell lung cancer. The specimens from both sites stained positive for cytokeratin, cluster designation 56, synaptophysin, chromogranin-A and thyroid transcription factor 1. It was concluded that the appendiceal small cell cancer originated from the lung. (Tuberc Respir Dis 2008;65:230-234)