Behavioral traits of species can play an important role in the functioning of the ecosystem and in evolving behavioural adaptations to survive according to environmental conditions.This note documents evidence of addi...Behavioral traits of species can play an important role in the functioning of the ecosystem and in evolving behavioural adaptations to survive according to environmental conditions.This note documents evidence of adding a rare observation by providing photographic evidence of the entanglement of a carcass of a juvenile Black Kite(Milvus migrans)from a nest and the use of nest by an adult individual,guarding the carcass.Documenting such behavior contributes to our understanding of the natural history and management of native species in an urban environment.Further,scientific studies/observations are needed to be conducted to reach some conclusion as to why species perform such behaviour.展开更多
The background models are crucially important for the object extraction for moving objects detection in a video.The Gaussian mixture model(GMM)is one of popular methods in the background models.Gaussian mixture model ...The background models are crucially important for the object extraction for moving objects detection in a video.The Gaussian mixture model(GMM)is one of popular methods in the background models.Gaussian mixture model which applied to the pig target detection has some shortcomings such as low efficiency of algorithm,misjudgment points and ghosts.This study proposed an improved algorithm based on adaptive Gaussian mixture model,to overcome the deficiencies of the traditional Gaussian mixture model in pig object detection.Based on Gaussian mixture background model,this paper introduced two new parameters of video frames m and T0.The Gaussian distribution was scanned once every m frames,the excessive Gaussian distribution was deleted to improve the convergence speed of the model.Meanwhile,using different learning rates to suppress ghosts,a higher decreasing learning rate was adopted to accelerate the background modeling before T_(0),the background model would become stable as the time continued and a smaller learning rate could be used.In order to maintain a stable background and reduce noise interference,a fixed learning rate after T_(0) was used.Results of experiments indicated that this algorithm could quickly build the initial background model,detect the moving target pigs,and extract the complete contours of the target pigs’.The algorithm is characterized by good robustness and adaptability.展开更多
文摘Behavioral traits of species can play an important role in the functioning of the ecosystem and in evolving behavioural adaptations to survive according to environmental conditions.This note documents evidence of adding a rare observation by providing photographic evidence of the entanglement of a carcass of a juvenile Black Kite(Milvus migrans)from a nest and the use of nest by an adult individual,guarding the carcass.Documenting such behavior contributes to our understanding of the natural history and management of native species in an urban environment.Further,scientific studies/observations are needed to be conducted to reach some conclusion as to why species perform such behaviour.
基金supported by the National High Technology Research and Development Program of China(2013AA102306)Independent Innovation Capability of Shandong Province(2014XGA13054).
文摘The background models are crucially important for the object extraction for moving objects detection in a video.The Gaussian mixture model(GMM)is one of popular methods in the background models.Gaussian mixture model which applied to the pig target detection has some shortcomings such as low efficiency of algorithm,misjudgment points and ghosts.This study proposed an improved algorithm based on adaptive Gaussian mixture model,to overcome the deficiencies of the traditional Gaussian mixture model in pig object detection.Based on Gaussian mixture background model,this paper introduced two new parameters of video frames m and T0.The Gaussian distribution was scanned once every m frames,the excessive Gaussian distribution was deleted to improve the convergence speed of the model.Meanwhile,using different learning rates to suppress ghosts,a higher decreasing learning rate was adopted to accelerate the background modeling before T_(0),the background model would become stable as the time continued and a smaller learning rate could be used.In order to maintain a stable background and reduce noise interference,a fixed learning rate after T_(0) was used.Results of experiments indicated that this algorithm could quickly build the initial background model,detect the moving target pigs,and extract the complete contours of the target pigs’.The algorithm is characterized by good robustness and adaptability.
