医疗X光图像的增强处理技术研究     

蔡睿妍  邱少明  姜伟 《大连大学学报》2012,33(3):17-20

针对X光成像中产生的图像清晰度不高,不利于医疗诊察的问题,提出了空间混合图像增强方法。将拉普拉斯变换和梯度变换相结合,分别增强图像的细节和边缘,同时避免引入新的噪声干扰。实验表明,该方法能够有效地增强X光图像的清晰度,在医疗诊察方面具有重要意义。  相似文献   

完全受电极反应速率控制的去卷积电流方程     

柳闽生  帅敏  赵新萍  陈昌云  曹小华 《南京晓庄学院学报》2006,22(4):41-44

本文提出了完全受电极反应速率控制的去卷积(包括高阶去卷积)电化学分析理论,并对波形的性质进行了较详细的讨论.  相似文献   

基于更新论证法考虑负索赔的一类与时间相关的风险模型的罚金折现期望函数     

聂高琴  刘次华  徐立霞 《上海大学学报(英文版)》2007,11(6):536-540

In this paper,the expected discounted penalty function is considered in the risk process with the time-correlated claims,that is,every main claim can cause a by-claim but the occurrence of the by-claim may be delayed.By the renewal argument,it is shown that the expected value satisfies a system of integro-differential equations.Moreover,the explicit expression for the Laplace transform of the expected value is derived by means of Rouchés theorem.A numerical example is  相似文献   

电力系统的谐波测量方法综述     

焦俊生 《黄山学院学报》2006,8(5):21-22

概述了目前电力系统中谐波测量方法,并进行了分类和评述,指出了各种方法的性能及优缺点,推测今后谐波测量的发展趋势.  相似文献   

Unpacking Rouché’s Theorem     

Russell W. Howell  Elmar Schrohe 《PRIMUS》2017,27(8-9):801-813

Abstract

Rouché’s Theorem is a standard topic in undergraduate complex analysis. It is usually covered near the end of the course with applications relating to pure mathematics only (e.g., using it to produce an alternate proof of the Fundamental Theorem of Algebra). The winding number provides a geometric interpretation relating to the conclusion of Rouché’s Theorem, but most undergraduate texts give no geometric insights that lead to an understanding of why Rouché’s Theorem holds. In addition, most texts do not inform students that a stronger version of the theorem exists. In this paper we present a simplified proof of the stronger version, which is a suitable topic for students to pursue as a short project, and provide a geometric argument for the weaker version. Finally, as a project for advanced students, we unpack a standard application of this theorem as used in control systems: the Nyquist stability criterion.  相似文献   

一类带弱奇异核的偏积分微分方程的两种数值解     

吴专保  徐大 《宜春学院学报》2006,28(2):7-10,14

给出了数值求解一类偏微分方程的两种全离散格式。x方向一种采用Legendre谱方法,第二种采用Galerkin谱方法,t方向用拉普拉斯的数值逆求解。第二种方法更具有可操作性,精度高,便于理论分析的优点.  相似文献   

Comparison of fast discrete wavelet transform algorithms     

孟书苹 《重庆大学学报(英文版)》2005,4(2):84-89

1 Introduction 1 With the development of the application of wavelet transform (WT), the speed of wavelet transform as a hot issue has been put forward. Fast algorithms of wavelet transform have been studied by many scholars. The Mallat pyramid algorithm put forward by Mallat, as the earliest one in this category, greatly reduces the arithmetic complexity of WT, and plays an important role in the theoretical research of the theory of wavelets. Since its coming into being, various fast algori…  相似文献   

具双曲动力边界的Laplace方程解的爆破     

袁德有  呼青英 《南阳师范学院学报》2007,6(6):9-11

讨论了具非线性双曲动力边界条件的Laplace方程解的爆破.在边界条件为半线性双曲型且初始能量为负及边界源项满足一定条件下,利用凸性方法得到了解的爆破性。  相似文献   

基于MATLAB图像增强算法的应用     

王平均 《辽宁高职学报》2013,(7):78-80,93

在图像增强的基本算法理论的基础上,结合MATLAB图像处理工具箱中的相关函数,对图像增强进行了处理,给出了处理程序代码及图像处理效果实例图,以得到更好的视觉效果,为后续处理提供方便,有效地促进了MATLAB软件在图像增强方面的研究。  相似文献   

一类带有p—Laplace算子的方程解的有界性     

马晓 《泰安师专学报》2013,(3):46-50

研究方程（Фp（x＇））＇＋λ2Фp（x）＋f（x）=e（t）的拉格朗目稳定性,其中Фp（s）=｜s｜p-2s,p≥2为常数;当x→∞时,扰动项f（x）=o（x）;e（t）为2πp周期函数,且πp=2π（p-1）1/p/psinπ/p.  相似文献