为了增加水下高速目标的识别特征维度,优化识别效果,该文设计了一种基于目标辐射噪声高速特征量(High Speed Characteristic Quantity,HSCQ)的分类方法。首先,针对水下高速目标辐射噪声的DEMON(Detection of Envelope Modulation On Noi...为了增加水下高速目标的识别特征维度,优化识别效果,该文设计了一种基于目标辐射噪声高速特征量(High Speed Characteristic Quantity,HSCQ)的分类方法。首先,针对水下高速目标辐射噪声的DEMON(Detection of Envelope Modulation On Noise)谱特征进行分析,根据DEMON谱的频率可分性,定义了DEMON谱调制分布比(Modulation Distribution Ratio,MDR)。然后,根据水下高速目标辐射噪声的功率谱历程图直纹特征,应用图像边缘检测、线谱生长等理论进行特征提取,并分析了功率谱历程图的直纹特征量(Straight-line Characteristic Quantity of Spectrum,SCQS)。最后,根据2种特征量的实测信号分析结果,定义了目标辐射噪声的HSCQ,实现了一种新的水下高速目标分类方法。实测信号分析结果显示,采用MDR或SCQS进行单特征量分类,非高速目标的误报率分别为21.4%和16.3%;采用HSCQ进行分类,非高速目标的误报率仅为4.1%。展开更多
This paper proposes an algorithm that extracts features of back side of the vehicle and detects the front vehicle in real-time by local feature tracking of vehicle in the continuous images.The features in back side of...This paper proposes an algorithm that extracts features of back side of the vehicle and detects the front vehicle in real-time by local feature tracking of vehicle in the continuous images.The features in back side of the vehicle are vertical and horizontal edges,shadow and symmetry.By comparing local features using the fixed window size,the features in the continuous images are tracked.A robust and fast Haarlike mask is used for detecting vertical and horizontal edges,and shadow is extracted by histogram equalization,and the sliding window method is used to compare both side templates of the detected candidates for extracting symmetry.The features for tracking are vertical edges,and histogram is used to compare location of the peak and magnitude of the edges.The method using local feature tracking in the continuous images is more robust for detecting vehicle than the method using single image,and the proposed algorithm is evaluated by continuous images obtained on the expressway and downtown.And it can be performed on real-time through applying it to the embedded system.展开更多
橡胶砂是一种具有潜在广泛应用价值的新型环保岩土材料。为研究橡胶砂在干燥击实、干燥未击实及掺水未击实3种不同初始状态下的直剪特征,对试样（橡胶颗粒、砂、橡胶砂）进行了一系列直接剪切试验,考虑了橡胶颗粒含量及竖向压力对其直...橡胶砂是一种具有潜在广泛应用价值的新型环保岩土材料。为研究橡胶砂在干燥击实、干燥未击实及掺水未击实3种不同初始状态下的直剪特征,对试样（橡胶颗粒、砂、橡胶砂）进行了一系列直接剪切试验,考虑了橡胶颗粒含量及竖向压力对其直剪特征的影响。结果表明：1）干燥击实橡胶砂的剪应力-剪切位移曲线随着橡胶含量的增大由软化型逐渐向硬化型转变;且随着橡胶砂密实性的降低,其剪应力-剪切位移曲线越来越多地表现为硬化型;掺水未击实橡胶砂的剪应力-剪切位移曲线均表现为硬化型。2）竖向压力小于50 k Pa且砂粒密实性较低时,橡胶颗粒可改善砂的强度,最优橡胶含量为20%~40%,且对掺水未击实砂的最优橡胶含量约为10%。3）橡胶砂越密实,越易产生剪胀,湿润橡胶砂比干燥橡胶砂越易产生剪缩。4）不同初始状态对橡胶砂的直剪特征如剪应力-剪切位移曲线、抗剪强度包线、竖向位移-剪切位移曲线的影响随橡胶含量的增大而减弱。展开更多
文摘为了增加水下高速目标的识别特征维度,优化识别效果,该文设计了一种基于目标辐射噪声高速特征量(High Speed Characteristic Quantity,HSCQ)的分类方法。首先,针对水下高速目标辐射噪声的DEMON(Detection of Envelope Modulation On Noise)谱特征进行分析,根据DEMON谱的频率可分性,定义了DEMON谱调制分布比(Modulation Distribution Ratio,MDR)。然后,根据水下高速目标辐射噪声的功率谱历程图直纹特征,应用图像边缘检测、线谱生长等理论进行特征提取,并分析了功率谱历程图的直纹特征量(Straight-line Characteristic Quantity of Spectrum,SCQS)。最后,根据2种特征量的实测信号分析结果,定义了目标辐射噪声的HSCQ,实现了一种新的水下高速目标分类方法。实测信号分析结果显示,采用MDR或SCQS进行单特征量分类,非高速目标的误报率分别为21.4%和16.3%;采用HSCQ进行分类,非高速目标的误报率仅为4.1%。
基金supported by the Brain Korea 21 Project in 2011 and MKE(The Ministry of Knowledge Economy),Korea,under the ITRC(Infor mation Technology Research Center)support program supervised by the NIPA(National IT Industry Promotion Agency)(NIPA-2011-C1090-1121-0010)
文摘This paper proposes an algorithm that extracts features of back side of the vehicle and detects the front vehicle in real-time by local feature tracking of vehicle in the continuous images.The features in back side of the vehicle are vertical and horizontal edges,shadow and symmetry.By comparing local features using the fixed window size,the features in the continuous images are tracked.A robust and fast Haarlike mask is used for detecting vertical and horizontal edges,and shadow is extracted by histogram equalization,and the sliding window method is used to compare both side templates of the detected candidates for extracting symmetry.The features for tracking are vertical edges,and histogram is used to compare location of the peak and magnitude of the edges.The method using local feature tracking in the continuous images is more robust for detecting vehicle than the method using single image,and the proposed algorithm is evaluated by continuous images obtained on the expressway and downtown.And it can be performed on real-time through applying it to the embedded system.
文摘橡胶砂是一种具有潜在广泛应用价值的新型环保岩土材料。为研究橡胶砂在干燥击实、干燥未击实及掺水未击实3种不同初始状态下的直剪特征,对试样（橡胶颗粒、砂、橡胶砂）进行了一系列直接剪切试验,考虑了橡胶颗粒含量及竖向压力对其直剪特征的影响。结果表明：1）干燥击实橡胶砂的剪应力-剪切位移曲线随着橡胶含量的增大由软化型逐渐向硬化型转变;且随着橡胶砂密实性的降低,其剪应力-剪切位移曲线越来越多地表现为硬化型;掺水未击实橡胶砂的剪应力-剪切位移曲线均表现为硬化型。2）竖向压力小于50 k Pa且砂粒密实性较低时,橡胶颗粒可改善砂的强度,最优橡胶含量为20%~40%,且对掺水未击实砂的最优橡胶含量约为10%。3）橡胶砂越密实,越易产生剪胀,湿润橡胶砂比干燥橡胶砂越易产生剪缩。4）不同初始状态对橡胶砂的直剪特征如剪应力-剪切位移曲线、抗剪强度包线、竖向位移-剪切位移曲线的影响随橡胶含量的增大而减弱。
