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调频高斯小波变换及其程序 总被引:3,自引:0,他引:3
本文系统地介绍了离散小波的一种常见形式─调频高斯小波,分析了尺度因子对母小波的影响,分别给出了输入函数和小波函数的离散区间的长度值及如何选取的方法。采用卷积积分法,对一定的输入函数进行了小波变换,给出了程序框图,采用Basic语言,编写了实用程序. 相似文献
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提出一种基于改进差分进化算法和开关电流微分器的连续小波变换实现的新方法。引入混沌初始化种群、自适应变异和指数递增交叉概率因子,提高差分进化算法的收敛速度和精度,构造小波函数逼近模型,并利用改进差分进化算法,求得小波逼近函数及频域传递函数。采用开关电流微分器作为基本单元,设计冲激响应为小波逼近函数的开关电流滤波器组,通过调节小波滤波器的时间常数,获得多尺度小波函数,实现连续小波变换。实验结果表明该方法可行。 相似文献
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根据连续时间滤波器设计理论,提出了一种基于开关电流双线性积分器和IFLF结构的取样数据小波滤波器设计方法。利用麦克劳林级数逼近小波频域函数,采用开关电流双线性积分器作为基本单元设计出传递函数为频域逼近函数的IFLF结构小波滤波器。通过调节滤波器时钟频率获得任意尺度小波函数实现连续小波变换。实验结果表明了该方法设计小波滤波器具有电路结构简单,小波函数尺度易于调节,通带灵敏度低的特点。 相似文献
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采用层叠算法,计算小波包基函数的离散逼近序列。改进特征图像相关识别方法,选用识别能力评价指标,利用图像和小波包基函数相关的直接变换优点改进最优基选择,提出多母小波多消失矩最优基。生成最优基的特征图像,采用体全息相关识别系统实现虹膜的光学识别,实验取得较好的效果。设计、制作多母小波多消失矩最优基光学小波包灰阶滤波器以进一步提升识别率。检测表明,滤波器符合设计要求。实验表明,该滤波器可有效提高识别率。 相似文献
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Changbao Wen Changchun Zhu Yongfeng Ju Yanzhang Qiu Hongke Xu Wenke Lu 《Industrial Electronics, IEEE Transactions on》2009,56(4):949-955
In this paper, the relationship between the center frequency and radius of bandwidth and its effect on the frequency band characteristics of dyadic wavelet processor array using surface acoustic wave (SAW) devices are studied, and an optimal frequency band design scheme is proposed. For an arbitrary scale wavelet processor, we proposed that the center frequency is defined to three times of the radius of frequency bandwidth. The frequency band design scheme ensures that the frequency band coverage factor is equal to 100% at -3 dB, which avoid the signal loss caused by the discrete frequency band and the device waste caused by the redundant frequency band. With the frequency band design scheme, an experiment of implementing a dyadic wavelet processor array using SAW devices with five scales is presented. Experimental results confirm that the frequency band coverage factor equals 100% at -3 dB without discrete and redundant frequency band. 相似文献
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With the continuous development of integrated circuits, the performance of the processor has been improved steadily. To integrate more cores in one processor is an effective way to improve the performance of the processor, while it is impossible to further improve the property of the processor by only increasing the clock frequency. For a processor with integrated multiple cores, its performance is determined not only by the number of cores, but also by communication efficiency between them. With more processor cores integrated on a chip, larger bandwidths are required to establish the communication among them. The traditional electrical interconnect has gradually become a bottleneck for improving the performance of multiple-core processors due to its limited bandwidth, high power consumption, and long latency. The optical interconnect is considered as a potential way to solve this issue. The optical router is the key device for realizing the optical interconnect. Its basic function is to achieve the data routing and switching between the local node and the multi-node. In this paper we present a five-port optical router for Mesh photonics network-on-chip. A five-port optical router composed of eight thermally tuned silicon Mach-Zehnder optical switches is demonstrated. The experimental spectral responses indicate that the optical signal-to-noise ratios of the optical router are over 13 dB in the wavelength range of 1525-1565 nm for all of its 20 optical links. Each optical link can manipulate 50 wavelength channels with the channel spacing of 100 GHz and the data rate of 32 Gbps for each wavelength channel in the same wavelength range. The lowest energy efficiency of the optical router is 43.4 fJ/bit. 相似文献
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为了避免传统基于RGB颜色模型方法在方程组中各等式线性相关和存在孔径的问题,提出一种在HSI颜色模型下结合小波变换的方法计算彩色图像视频序列光流场的计算方法,这里将传统的灰度图像光流估计方法与HSI颜色模型估计方法相结合,并且用小波变换方法对光流矢量场的异常数据点或因为匹配错误而产生的异常块数据进行剔除,从而有效提高光流场估计精度,得到精密的彩色图像光流矢量场特征。 相似文献
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基于光纤通信网络对一种高速数据采集系统进行了设计。通过多路数据采集方式,并与光纤通信网络相结合,使得高速数据采集能力得到大幅提高。该系统主要由处理系统、采集模块及光纤网络共同构成,光纤通信网络前端采集模块在模拟滤波、采样完成后,通过处理器实现信号的传输。此外,通过光数据采集系统实验,证明了在高速数据采集系统中应用光纤通信网络能实现速率在10 Gbit·s-1以下的光数据接入采集。 相似文献
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大气湍流是影响光学成像系统分辨率不可避免的因素之一。为了研究大气湍流内外尺度、湍流轮廓线及探测高度对光学成像系统分辨率的影响,根据光学成像系统积分分辨率理论及修正Von Karman湍流谱,推导了斜程传输路径下考虑湍流内、外尺度的光学成像系统的分辨率积分公式。数值计算中应用ITU-R公布的随高度变化的大气折射率结构常数模型,结果表明:湍流内尺度对光学成像系统分辨率的影响要远小于湍流外尺度对分辨率的影响,而湍流内尺度又限制着外尺度对光学成像系统分辨率的影响;斜程传输时,湍流轮廓线的影响大于外尺度对积分分辨率的影响;光学成像系统分辨率在近地面受近地面大气结构常数的影响大,而当高度大于5 000 m时,光学成像系统分辨率受风速的影响大。 相似文献