The second, we construct the line spread function of ultrasound system using horizontal plane target and vertical plane target of phantom, then transform it by Fourier transform method, then we obtain the MTF of system.
首先 ,根据超声成像及体模内部结构的特点 ,将体模内的分辨目标群视作条形输入 ,提出对比度法求得系统的MTF ;其次 ,利用体模内相同深度处的目标群构造系统的线扩散函数 ,经过傅里叶变换得到系统的MTF ,并对两种方法取得的结果进行了分
The line spread function(LSF) of the imaging system was given by analyzing the edge image.
通过对刀口图像分析得到了系统的线扩散函数,再对其进行傅里叶变换得到调制传递函数,最后通过维纳滤波和约束最小二乘方滤波两种方法对图像进行了重建,得到比较清晰的边界情况和图像轮廓。
In this paper,we consider the problem of the optimal estimator of the discrete distribution function f under the loss L(F,a)=∫|F(t)-a(t)|(F(t))~α(1-F(t))~βdR(t).
这篇文章在损失L(F,a)=∫|F(t)-a(t)|(F(t))~α(1-F(t))~βdF(t)下,考虑了离散分布函数F的估计问题。
Analysis of Microwave Nonlinear Scattering Function and Large-signal Modeling Based on Wavelet Neural Network;
微波非线性散射函数理论分析和基于小波神经网络大信号建模技术的研究
Analysis of Microwave Nonlinear Scattering Function Theory and Study on Large-Signal Modeling with BP Neural Network;
微波非线性散射函数理论分析和基于BP神经网络大信号建模技术的研究
In this article,a novel describing function is adopted to describe nonlinear characteristic of RF power components:nonlinear scattering function.
本文采用了一个新的适用于描述大信号非线性特性的描述函数———非线性散射函数 。
The Optical Transfer Function( OTF) of a linear optical systemcan be derived from the Fourier Transfer of the Line Spread Function( LSF).
线性光学系统的传递函数(TF)由线扩散函数的傅立叶变换求出。
Hyperbolio Function Series Method for Solving a Kind of Nonlinear Reation Diffusion Equtions;
一类非线性反应扩散方程的双曲函数级数解法
Numerical Simulation of Diffusion Processes Based on Radial Basis Function Method
扩散过程数值仿真的径向基函数方法
The Measurement of the Point Spread Function in Optical System with CCD;
用CCD测定光学系统的点扩散函数
A Upscaling Method of Digital Elevation Model with Point Spread Function
利用点扩散函数进行DEM尺度转换
Effect of carrier diffusion on modulation transfer function of CCD
载流子扩散对CCD调制传递函数的影响
Riccati function solutions of nonlinear dispersive-dissipative mKdv equation
非线性色散耗散mKdv方程的Riccati函数解
Nonparametric Estimation of Drift and Volatility Functions in Stochastic Diffusion Models
随机扩散模型中的漂移函数与波动率函数的非参数估计
Researches on Simulation Technology for Microwave Nonlinear Scattering Function;
微波非线性散射函数仿真技术的研究
Effect of Seismic Intensity Measure Function to the IDA Curves Dispersion
烈度指标函数对IDA曲线离散性的影响
Strict Lyapunov Functions for Nonlinear Discrete-Time Systems
非线性离散系统的严格Lyapunov函数
A Residual-free Bubble Method for Parabolic Convection-dominated Diffusion Problems
抛物型强对流-扩散方程的泡函数有限元法
A cross-layer multi-optimized function based directed diffusion protocol
一种基于多优化函数的跨层定向扩散路由协议
Analysis on Spectrum Characteristic of Boolean Functions Satisfying k-strengthened Propagation Criterion
满足k次强扩散准则的布尔函数谱特征分析
Numerical Methods for a Class of Reaction-Diffusion Equation;
一类非线性反应扩散方程的数值解法
Measurements of Thermal Conductivity and Diffusivity of Loose Coal Using a Hot-Wire Method
热线法同时测松散煤体导热系数及热扩散率
A New Method for Integer Linear Programming Based on Discrete Filled Function Method
一个基于离散填充函数的整数线性规划方法
The Extended Hyperbolic Function Method and Exact Solutions of Nonlinear Equations;
扩展双曲函数法与非线性方程的精确解