To extract and tr ack moving objects is usually one of the most important tasks of intelligent video surveillance systems. This paper presents a fast and adaptive background subtraction alg...To extract and tr ack moving objects is usually one of the most important tasks of intelligent video surveillance systems. This paper presents a fast and adaptive background subtraction algorithm and the motion tracking process using this algorithm. The algorithm uses only luminance components of sampled image sequence pixels and models every pixel in a statistical model. The algorithm is characterized by its ability of real time detecting sudden lighting changes, and extracting and tracking motion objects faster. It is shown that our algorithm can be realized with lower time and space complexity and adjustable object detection error rate with comparison to other background subtraction algorithms. Making use of the algorithm, an indoor monitoring system is also worked out and the motion tracking process is presented in this paper. Experimental results testify the algorithm's good performances when used in an indoor monitoring system.展开更多
Insufficient physical activity(PA),prolonged sedentary behavior(SB)and inadequate sleep(SLP)are detrimental factors to population health.To address health issues caused by insufficient PA,excessive SB and poor SLP,the...Insufficient physical activity(PA),prolonged sedentary behavior(SB)and inadequate sleep(SLP)are detrimental factors to population health.To address health issues caused by insufficient PA,excessive SB and poor SLP,the World Health Organization(WHO)updated PA and SB guidelines for all populations aged from 5 years to 65 years and older in 2020.For children under 5 years old,the WHO issued the first global guidelines for PA,SB and SLP(collectively refer to movement behaviors)in April 2019.The guidelines applied a holistic approach to promote health behaviors,filling the gap of no comprehensive global movement guidelines for young children.Although the guidelines for young children offer guidance for health promotion,some research and practice implications and other issues should be mentioned.This commentary includes considerations for the importance of the WHO guidelines for younger children,critical analysis of evidence for developing the guidelines,and recommendations for future research and practice.The aim of this paper is to further advance health research in younger populations.展开更多
文摘To extract and tr ack moving objects is usually one of the most important tasks of intelligent video surveillance systems. This paper presents a fast and adaptive background subtraction algorithm and the motion tracking process using this algorithm. The algorithm uses only luminance components of sampled image sequence pixels and models every pixel in a statistical model. The algorithm is characterized by its ability of real time detecting sudden lighting changes, and extracting and tracking motion objects faster. It is shown that our algorithm can be realized with lower time and space complexity and adjustable object detection error rate with comparison to other background subtraction algorithms. Making use of the algorithm, an indoor monitoring system is also worked out and the motion tracking process is presented in this paper. Experimental results testify the algorithm's good performances when used in an indoor monitoring system.
基金supported by the General Program in Education of Planning Project by Shanghai Philosophy and Social Science(A1904)the General Project of the National Social Science Foundation of China(19BTY077).
文摘Insufficient physical activity(PA),prolonged sedentary behavior(SB)and inadequate sleep(SLP)are detrimental factors to population health.To address health issues caused by insufficient PA,excessive SB and poor SLP,the World Health Organization(WHO)updated PA and SB guidelines for all populations aged from 5 years to 65 years and older in 2020.For children under 5 years old,the WHO issued the first global guidelines for PA,SB and SLP(collectively refer to movement behaviors)in April 2019.The guidelines applied a holistic approach to promote health behaviors,filling the gap of no comprehensive global movement guidelines for young children.Although the guidelines for young children offer guidance for health promotion,some research and practice implications and other issues should be mentioned.This commentary includes considerations for the importance of the WHO guidelines for younger children,critical analysis of evidence for developing the guidelines,and recommendations for future research and practice.The aim of this paper is to further advance health research in younger populations.
