In order to realize infrared target tracking accurately under motion platform,and make up for the shortcoming of the nuclear density estimation based on gradation feature,an adaptive kalman-mean shift algorithm based ...In order to realize infrared target tracking accurately under motion platform,and make up for the shortcoming of the nuclear density estimation based on gradation feature,an adaptive kalman-mean shift algorithm based on multi-feature fusion is proposed.The target model based on edge-gradation feature fusion is applied in the mean shift algorithm.The starting position at present of an infrared target is predicted by a kalman filter,and then a scale updating item of tracking window is appended based on the relationship between mutual information and the object scale.Then the moving object,especially the object with a variable scale,is adaptively tracked under motion platform.Experimental results demonstrate that the adaptability of mean shift algorithm is enhanced by the improved scheme,which can be applied in the process of long time tracking for the object with a variable scale.展开更多
Purpose: To describe the association of demographic, behavioral, medical, and nonretinal ocular factors with the incidence of neovascular age-related macular degeneration (AMD) and central geographic atrophy (CGA) in ...Purpose: To describe the association of demographic, behavioral, medical, and nonretinal ocular factors with the incidence of neovascular age-related macular degeneration (AMD) and central geographic atrophy (CGA) in the Age-Related Eye Disease Study (AREDS), a randomized trial of antioxidants and zinc supplementat ion prophylaxis for development of advanced AMD. Design: Clinic-based prospecti ve cohort study. Participants: Of individuals with early or intermediate AMD at baseline with a median follow-up of 6.3 years, 788 were at risk of developing a dvanced AMD in one eye (the fellow eye had advanced AMD), and 2506 were at risk in both eyes. Methods: The incidence of neovascular AMD and CGA was assessed fro m stereoscopic color fundus photographs taken at baseline and at annual visits b eginning at year 2. Main Outcome Measures: Neovascular AMD was defined as photoc oagulation for choroidal neovascularization, or photographic documentation at th e reading center of any of the following: nondrusenoid retinal pigment epithelia l detachment, serous or hemorrhagic retinal detachment, hemorrhage under the ret ina or the retinal pigment epithelium, and subretinal fibrosis. Central geograph ic atrophy was defined as geographic atrophy involving the center of the macula. Results: In multivariable models, in persons at risk of advanced AMD in both ey es, while controlling for age, gender, and AREDS treatment group, the following variables were statistically significantly associated with the incidence of neov ascularAMD: race (odds ratio [OR], white vs. black, 6.77; 95%confidence inter va l [CI], 1.24-36.9) and larger amount smoked (OR, >10 vs. ≤10 pack-years [a pa ck-year is an average of 1 pack of cigarette smoked per day for a year], 1.55; 95%CI, 1.15-2.09). The following were statistically significantly associated w ith the incidence of CGA: less education (OR, high school graduate or less vs. c ollege graduate, 1.75; 95%CI, 1.10-2.78), greater body mass index (BMI) (OR, o bese vs. nonobese, 1.93; 95%CI, 1.25-2.65), larger amount smoked (OR, >10 pack -years vs. ≤10 pack-years, 1.82; 95%CI, 1.25-2.65), and antacid use (OR, 0. 29; 95%CI, 0.09-0.91). In persons at risk of developing advanced AMD in one ey e, the incidence of neovascular AMD was associated with diabetes (OR, 1.88; 95% CI, 1.07-3.31), and the incidence of CGA was associated with use of antiinflamm atorymedications (OR, 0.22; 95%CI, 0.08-0.59). Conclusions: Results suggest th at, among persons with early or intermediate AMD, smoking and BMI are modifiable factors associated with progression to advanced AMD, and suggest other associat ions (e.g., use of antacids and antiinflammatory medications) that warrant furth er study.展开更多
基金supported by the National Defense Research Fund of China (No.43511121B)
文摘In order to realize infrared target tracking accurately under motion platform,and make up for the shortcoming of the nuclear density estimation based on gradation feature,an adaptive kalman-mean shift algorithm based on multi-feature fusion is proposed.The target model based on edge-gradation feature fusion is applied in the mean shift algorithm.The starting position at present of an infrared target is predicted by a kalman filter,and then a scale updating item of tracking window is appended based on the relationship between mutual information and the object scale.Then the moving object,especially the object with a variable scale,is adaptively tracked under motion platform.Experimental results demonstrate that the adaptability of mean shift algorithm is enhanced by the improved scheme,which can be applied in the process of long time tracking for the object with a variable scale.
文摘Purpose: To describe the association of demographic, behavioral, medical, and nonretinal ocular factors with the incidence of neovascular age-related macular degeneration (AMD) and central geographic atrophy (CGA) in the Age-Related Eye Disease Study (AREDS), a randomized trial of antioxidants and zinc supplementat ion prophylaxis for development of advanced AMD. Design: Clinic-based prospecti ve cohort study. Participants: Of individuals with early or intermediate AMD at baseline with a median follow-up of 6.3 years, 788 were at risk of developing a dvanced AMD in one eye (the fellow eye had advanced AMD), and 2506 were at risk in both eyes. Methods: The incidence of neovascular AMD and CGA was assessed fro m stereoscopic color fundus photographs taken at baseline and at annual visits b eginning at year 2. Main Outcome Measures: Neovascular AMD was defined as photoc oagulation for choroidal neovascularization, or photographic documentation at th e reading center of any of the following: nondrusenoid retinal pigment epithelia l detachment, serous or hemorrhagic retinal detachment, hemorrhage under the ret ina or the retinal pigment epithelium, and subretinal fibrosis. Central geograph ic atrophy was defined as geographic atrophy involving the center of the macula. Results: In multivariable models, in persons at risk of advanced AMD in both ey es, while controlling for age, gender, and AREDS treatment group, the following variables were statistically significantly associated with the incidence of neov ascularAMD: race (odds ratio [OR], white vs. black, 6.77; 95%confidence inter va l [CI], 1.24-36.9) and larger amount smoked (OR, >10 vs. ≤10 pack-years [a pa ck-year is an average of 1 pack of cigarette smoked per day for a year], 1.55; 95%CI, 1.15-2.09). The following were statistically significantly associated w ith the incidence of CGA: less education (OR, high school graduate or less vs. c ollege graduate, 1.75; 95%CI, 1.10-2.78), greater body mass index (BMI) (OR, o bese vs. nonobese, 1.93; 95%CI, 1.25-2.65), larger amount smoked (OR, >10 pack -years vs. ≤10 pack-years, 1.82; 95%CI, 1.25-2.65), and antacid use (OR, 0. 29; 95%CI, 0.09-0.91). In persons at risk of developing advanced AMD in one ey e, the incidence of neovascular AMD was associated with diabetes (OR, 1.88; 95% CI, 1.07-3.31), and the incidence of CGA was associated with use of antiinflamm atorymedications (OR, 0.22; 95%CI, 0.08-0.59). Conclusions: Results suggest th at, among persons with early or intermediate AMD, smoking and BMI are modifiable factors associated with progression to advanced AMD, and suggest other associat ions (e.g., use of antacids and antiinflammatory medications) that warrant furth er study.
