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Mahalanobis Distance Cross-Correlation for Illumination-Invariant Stereo Matching
Seungryong Kim,Bumsub Ham,Bongjoe Kim,Kwanghoon Sohn Institute of Electrical and Electronics Engineers 2014 IEEE Transactions on Circuits and Systems for Vide Vol. No.
<P>A robust similarity measure called the Mahalanobis distance cross-correlation (MDCC) is proposed for illumination-invariant stereo matching, which uses a local color distribution within support windows. It is shown that the Mahalanobis distance between the color itself and the average color is preserved under affine transformation. The MDCC converts pixels within each support window into the Mahalanobis distance transform (MDT) space. The similarity between MDT pairs is then computed using the cross-correlation with an asymmetric weight function based on the Mahalanobis distance. The MDCC considers correlation on cross-color channels, thus providing robustness to affine illumination variation. Experimental results show that the MDCC outperforms state-of-the-art similarity measures in terms of stereo matching for image pairs taken under different illumination conditions.</P>
Energy Minimization Based Semantic Video Object Extraction
김동현(Kim Donghyun),최성환(Choi Sunghwan),김봉조(Kim Bongjoe),신형철(Shin Hyungchul),손광훈(Sohn Kwanghoon) 한국방송·미디어공학회 2010 한국방송공학회 학술발표대회 논문집 Vol.2010 No.7
In this paper, we propose a semi-automatic method for semantic video object extraction which extracts meaningful objects from an input sequence with one correctly segmented training image. Given one correctly segmented image acquired by the user's interaction in the first frame, the proposed method automatically segments and tracks the objects in the following frames. We formulate the semantic object extraction procedure as an energy minimization problem at the fragment level instead of pixel level. The proposed energy function consists of two terms: data term and smoothness term. The data term is computed by considering patch similarity, color, and motion information. Then, the smoothness term is introduced to enforce the spatial continuity. Finally, iterated conditional modes (ICM) optimization is used to minimize energy function in a globally optimal manner. The proposed semantic video object extraction method provides faithful results for various types of image sequences.
SunMi Kim,CheolSoon Lee,ChulSoo Park,BongJo Kim,Boseok Cha,SoJin Lee,JiYeong Seo,Jaemin Kim 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3
The aim of this study was to investigate the relationship between metabolic syndrome and suicidal ideation in Korean. This study was based on the 2010 Korean National Health and Nutrition Examination Survey. A questionnaire was used to measure suicidal ideation and physical examination was performed to measure waist circumference, blood pressure, fasting glucose, cholesterol and triglyceride levels. Complex samples logistic regression was performed to estimate the relationship between metabolic syndrome and suicidal ideation among adults and adolescents. Subjects with metabolic syndrome were more likely to have suicidal ideation in adult. There would be essential needs to evaluate suicidal ideation in adult with metabolic syndrome and to follow up suicidal ideation in adolescents with metabolic syndrome.
가스 연료 엔진의 연소 조건에 따른 배기 밸브 온도 비교
김병현(Byunghyun Kim),김봉조(Bongjo Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In order to meet global requirement in terms of fossil fuel capacity and carbon dioxide reduction alternative fuels such as ethanol, methanol, LPG, and CNG have been widely applied to automotive internal combustion engines. In general, it is well known that the engine originally based on gasoline fuel should be modified with hardened materials especially for valves and valve seats to cope with these alternative fuels. This is because alternative fuels can cause valve burning and seat wear due mainly to different combustion characteristics and thermal management is one of key control parameters for engine development. This study has been performed to find a way to optimize engine calibration in addition to right selection of hardened materials for gaseous fuel application such as LPG and CNG. A correlation between valve temperature, exhaust gas temperature and valve system wear has been experimentally analyzed and reported.