A new method using plane fitting to decide whether a domain block is similar enough to a given range block is proposed in this paper. First, three coefficients are computed for describing each range and domain block. ...A new method using plane fitting to decide whether a domain block is similar enough to a given range block is proposed in this paper. First, three coefficients are computed for describing each range and domain block. Then, the best-matched one for every range block is obtained by analysing the relation between their coefficients. Experimental results show that the proposed method can shorten encoding time markedly, while the retrieved image quality is still acceptable. In the decoding step, a kind of simple line fitting on block boundaries is used to reduce blocking effects. At the same time, the proposed method can also achieve a high compression ratio.展开更多
As wavelet basis in wavelet analysis is neither arbitrary nor unique,the same signal dealing with different wavelet bases will generate different results.Therefore,how to construct a wavelet basis suitable for the cha...As wavelet basis in wavelet analysis is neither arbitrary nor unique,the same signal dealing with different wavelet bases will generate different results.Therefore,how to construct a wavelet basis suitable for the characteristics of the analyzed signal and solve its algorithm and realization is a fundamental problem which perplexed many researchers.To solve these problems,in accordance with the basic features of the measured millisecond blast vibration signal,a new wavelet basis construction method based on the separation blast vibration signal is proposed,and the feasibility of this method is verified by comparing the practical effect of the newly constructed wavelet with other known wavelets in signal processing.展开更多
提出基于布里渊光时域反射(Brillouin optic time domain reflectometer,BOTDR)分布式检测技术与解调信号的光缆隐蔽性缺陷识别方法,识别检测光缆隐蔽性缺陷。在生产阶段将光纤植入多股碳纤维导线复合芯内部作为传感器,依据BOTDR技术与...提出基于布里渊光时域反射(Brillouin optic time domain reflectometer,BOTDR)分布式检测技术与解调信号的光缆隐蔽性缺陷识别方法,识别检测光缆隐蔽性缺陷。在生产阶段将光纤植入多股碳纤维导线复合芯内部作为传感器,依据BOTDR技术与光时域反射(optic time domain reflectometer,OTDR)技术原理,构建关于碳纤维导线光缆隐蔽性检测的分布式传感系统,利用光纤对温度、应力、传播损耗的高精度感知,多维度地分析碳纤维导线光缆的隐蔽性缺陷及位置分布,实现光缆的隐蔽性缺陷识别。利用morlet小波解调布里渊散射信号,提取包络信息,去除信号噪声,采用列文伯格-马夸尔特算法,拟合布里渊散射谱数据,精确估计最优Brillouin频移量参数,提升整体缺陷识别精度。实验证明:该方法可以准确地对光缆的隐蔽性缺陷进行表征,实现多股碳纤维导线光缆隐蔽性缺陷的快速、有效识别,促进碳纤维导线光缆更好地应用于增容、大跨越等工程中。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 61173183, 60973152, and 60573172)the Special Scientific Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070141014)the Natural Science Foundation of Liaoning Province, China (Grant No. 20082165)
文摘A new method using plane fitting to decide whether a domain block is similar enough to a given range block is proposed in this paper. First, three coefficients are computed for describing each range and domain block. Then, the best-matched one for every range block is obtained by analysing the relation between their coefficients. Experimental results show that the proposed method can shorten encoding time markedly, while the retrieved image quality is still acceptable. In the decoding step, a kind of simple line fitting on block boundaries is used to reduce blocking effects. At the same time, the proposed method can also achieve a high compression ratio.
基金Projects(51078043,51278071,51308072)supported by the National Natural Science Foundation of China
文摘As wavelet basis in wavelet analysis is neither arbitrary nor unique,the same signal dealing with different wavelet bases will generate different results.Therefore,how to construct a wavelet basis suitable for the characteristics of the analyzed signal and solve its algorithm and realization is a fundamental problem which perplexed many researchers.To solve these problems,in accordance with the basic features of the measured millisecond blast vibration signal,a new wavelet basis construction method based on the separation blast vibration signal is proposed,and the feasibility of this method is verified by comparing the practical effect of the newly constructed wavelet with other known wavelets in signal processing.
文摘提出基于布里渊光时域反射(Brillouin optic time domain reflectometer,BOTDR)分布式检测技术与解调信号的光缆隐蔽性缺陷识别方法,识别检测光缆隐蔽性缺陷。在生产阶段将光纤植入多股碳纤维导线复合芯内部作为传感器,依据BOTDR技术与光时域反射(optic time domain reflectometer,OTDR)技术原理,构建关于碳纤维导线光缆隐蔽性检测的分布式传感系统,利用光纤对温度、应力、传播损耗的高精度感知,多维度地分析碳纤维导线光缆的隐蔽性缺陷及位置分布,实现光缆的隐蔽性缺陷识别。利用morlet小波解调布里渊散射信号,提取包络信息,去除信号噪声,采用列文伯格-马夸尔特算法,拟合布里渊散射谱数据,精确估计最优Brillouin频移量参数,提升整体缺陷识别精度。实验证明:该方法可以准确地对光缆的隐蔽性缺陷进行表征,实现多股碳纤维导线光缆隐蔽性缺陷的快速、有效识别,促进碳纤维导线光缆更好地应用于增容、大跨越等工程中。
