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양안식 영상을 이용한 신뢰도 기반의 다시점 영상 생성 방법
김도영,호요성,Kim, Do Young,Ho, Yo-Sung 한국스마트미디어학회 2013 스마트미디어저널 Vol.2 No.4
다시점 영상 시스템은 실감나는 3차원 입체감을 제공하고, 사용자로 하여금 자유로운 시점을 선택할 수 있게 한다. 하지만 한 번에 많은 양의 데이터를 전송하는 것은 어려운 일이므로 두 시점 흑은 세 시점의 영상을 전송하고, 깊이 정보를 이용하여 중간 시점의 영상을 합성하여 제공한다. 본 논문에서는 양안식 영상으로부터 고품질의 다시점 영상을 생성하는 방법을 제안한다. 먼저 스테레오 정합은 폐색 영역을 비롯한 모든 화소들의 정확한 변위 값을 찾을 수 없기 때문에, 배경 값을 이용하여 폐색 영역의 화소들을 처리하는 방법을 제안한다. 또한 합성 영상의 품질을 저하시키는 변위 영상 내의 물체 경계선 불일치 문제점 해결을 위해 결합형 양방향 필터를 적용한다. 마지막으로 불량 화소와 빈 공간때문에 발생하는 오류를 줄이기 위해 신뢰 영상을 이용하여 중간 시점의 영상을 생성한다. 실험을 통해 제안한 방법을 이용할 때 기존의 방법보다 합성 성능이 뛰어남을 확인했다. Multi-view video system provides both realistic 3D feelings and free-view navigation. But it is hard to transmit too huge data, so we send only two or three view images and generate intermediate view image using depth information. In this paper, we propose high quality multi-view image generation method from stereoscopic images. Since the stereo matching method does not provide accurate disparity values for all the pixels, especially at the occlusion area, we propose an occlusion handling method using the background pixels at first. We also apply a joint bilateral filtering to enhance the disparity map at the object boundary since it can affect the quality of synthesized images significantly. Finally, we can generate virtual view images at intermediate view positions using confidence map to reduce bad pixel and hole's error. Experimental results show the proposed method performs better than the conventional method.
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김도영(Do Young Kim),김영준(Young Jun Kim),고승욱(Seung Uk Go),김영찬(Young Chan Kim),이요한(Yo Han Lee),김창희(Changhee Kim) 한국SCM학회 2018 한국SCM학회지 Vol.18 No.2
In this report, we tried to form a new logistic network by introducing autonomous vehicles to present ideas for effective reduction of national logistics costs. For the efficient operation of autonomous vehicles, we conducted Analytic Hierarchy Process(AHP) and selected new hubs from existing post office locations. The results of the analysis are summarized as follows: nine determinants were derived for optimal location selection. Highways(0.295), National Roads(0.169), Railways(0.064), Urban Size(0.179), Urban Accessibility(0.054), GRDP(0.099), Public Land Price(0.08), Interchange(0.02), Scalability(0.04). the most influential location determinant is traffic accessibility, whereas the least influential factor is site condition. Although there are some limitations in the realistic assumption, it was deemed that the formation of a new network using autonomous vehicles is sufficiently efficient and it gave sufficient implications for future research.
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최기홍(Gi Hong Choi),김창희(Kim Chang Hee),한대훈(Dai Hoon Han),김동현(Dong Hyun Kim),최새별(Sae Byeol Choi),강창무(Chang Moo Kang),김경식(Kyung Sik Kim),최진섭(Jin Sub Choi),박영년(Young Nyun Park),박준용(Jun Yong Park),김도영(Do Yo 한국간담췌외과학회 2008 한국간담췌외과학회지 Vol.12 No.4
Purpose: Recent studies have reported improved perioperative and long-term outcomes for the initial postoperative results for patients with a huge HCC. The purpose of this study was to investigate the surgical outcomes of patients with a huge HCC and we wanted to identify any subgroup that would likely benefit from hepatic resection. Methods: From January 1996 to August 2006, 55 patients were diagnosed with a huge HCC (≥ 10cm in diameter). All the tumors were classified as either the expanding nodular type or the non- expanding nodular type. Results: The mean age of the patients was 50.6 years and 39 patients were male. The most common cause of liver disease was hepatitis B virus. The mean size of tumor was 11.9 cm. Microscopic liver cirrhosis was present in 17 patients. Twenty-three patients had tumors of the expanding nodular type. Curative resection was performed in 50 patients. The 5-year diseasefree and overall survival rates after resection were 35.8% and 41.0%, respectively. Univariate analysis revealed that surgical margins of ≤ 1.0, a non-curative resection, the non-expanding nodular type and microscopic vascular invasion were adverse prognostic factors for survival. Multivariate analysis indicated that the gross tumor classification (expanding nodular vs. nonexpanding nodular) was the only independent prognostic factor. Conclusions: Huge HCC is not a homogenous group and the gross tumor pattern may represent the biologic behavior of huge HCC. Because the outcome of surgical treatment is far better than that of non-surgical treatment, resection should be actively considered for patients with a huge HCC. An expanding nodular type tumor is the best candidate for surgical resection.
ScienceON
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