卷积神经网络作为深度学习的重要分支,在图像识别、图像分类等方面有广泛的应用,其中快速特征嵌入卷积神经网络框架(convolutional architecture for fast feature embedding,Caffe)是目前炙手可热的深度学习工具.针对固定群体中的目标...卷积神经网络作为深度学习的重要分支,在图像识别、图像分类等方面有广泛的应用,其中快速特征嵌入卷积神经网络框架(convolutional architecture for fast feature embedding,Caffe)是目前炙手可热的深度学习工具.针对固定群体中的目标人物,提出一种基于卷积神经网络的分类方法,该方法不依赖于人脸图像集,而是通过摄像头采集视频,并利用直方图的归一化互相关方法从视频中截取训练图片,再通过Caffe产生训练模型,并将个体目标图片在模型中进行匹配,达到在固定人物群体中对个体目标进行分类的目的.实验结果表明,利用前期的训练模型可对固定群体中的个体目标进行准确匹配.展开更多
[Objective]Urban floods are occurring more frequently because of global climate change and urbanization.Accordingly,urban rainstorm and flood forecasting has become a priority in urban hydrology research.However,two-d...[Objective]Urban floods are occurring more frequently because of global climate change and urbanization.Accordingly,urban rainstorm and flood forecasting has become a priority in urban hydrology research.However,two-dimensional hydrodynamic models execute calculations slowly,hindering the rapid simulation and forecasting of urban floods.To overcome this limitation and accelerate the speed and improve the accuracy of urban flood simulations and forecasting,numerical simulations and deep learning were combined to develop a more effective urban flood forecasting method.[Methods]Specifically,a cellular automata model was used to simulate the urban flood process and address the need to include a large number of datasets in the deep learning process.Meanwhile,to shorten the time required for urban flood forecasting,a convolutional neural network model was used to establish the mapping relationship between rainfall and inundation depth.[Results]The results show that the relative error of forecasting the maximum inundation depth in flood-prone locations is less than 10%,and the Nash efficiency coefficient of forecasting inundation depth series in flood-prone locations is greater than 0.75.[Conclusion]The result demonstrated that the proposed method could execute highly accurate simulations and quickly produce forecasts,illustrating its superiority as an urban flood forecasting technique.展开更多
文摘卷积神经网络作为深度学习的重要分支,在图像识别、图像分类等方面有广泛的应用,其中快速特征嵌入卷积神经网络框架(convolutional architecture for fast feature embedding,Caffe)是目前炙手可热的深度学习工具.针对固定群体中的目标人物,提出一种基于卷积神经网络的分类方法,该方法不依赖于人脸图像集,而是通过摄像头采集视频,并利用直方图的归一化互相关方法从视频中截取训练图片,再通过Caffe产生训练模型,并将个体目标图片在模型中进行匹配,达到在固定人物群体中对个体目标进行分类的目的.实验结果表明,利用前期的训练模型可对固定群体中的个体目标进行准确匹配.
文摘[Objective]Urban floods are occurring more frequently because of global climate change and urbanization.Accordingly,urban rainstorm and flood forecasting has become a priority in urban hydrology research.However,two-dimensional hydrodynamic models execute calculations slowly,hindering the rapid simulation and forecasting of urban floods.To overcome this limitation and accelerate the speed and improve the accuracy of urban flood simulations and forecasting,numerical simulations and deep learning were combined to develop a more effective urban flood forecasting method.[Methods]Specifically,a cellular automata model was used to simulate the urban flood process and address the need to include a large number of datasets in the deep learning process.Meanwhile,to shorten the time required for urban flood forecasting,a convolutional neural network model was used to establish the mapping relationship between rainfall and inundation depth.[Results]The results show that the relative error of forecasting the maximum inundation depth in flood-prone locations is less than 10%,and the Nash efficiency coefficient of forecasting inundation depth series in flood-prone locations is greater than 0.75.[Conclusion]The result demonstrated that the proposed method could execute highly accurate simulations and quickly produce forecasts,illustrating its superiority as an urban flood forecasting technique.
