基于小波变换的红外图像边缘提取研究

红外图像的边缘提取是其判读和识别的重要技术基础。红外图像背景复杂、噪声较为严重。针对这一特点，利用小波变换易于消除噪声、运算方便的特点，提出了一种基于小波变换的红外图像边缘提取算法。首先利用小波算法对红外图像进行滤噪，然后利用高斯函数作为平滑函数对图像进行水平和垂直方向的小波变换，提取红外图像边缘特征。给出了仿真实例，证明了该算法的科学性和可靠性。     

基于小波边缘提取的目标光学相关识别

为提高联合变换相关器对复杂背景图像的识别能力,提出了基于小波变换边缘提取的联合变换相关器。利用具有多尺度分析功能的小波变换工具对联合图像进行边缘检测,所提取的边缘图像能保留更多的细节信息,改善复杂背景下的目标识别能力。计算机模拟和光学实验结果均表明,用小波变换边缘提取的联合图像进行相关识别,能明显增强相关峰的强度,提高目标识别能力。     

小波变换在目标识别中的应用

利用小波变换具有易于消除噪声、运算方便、能够体现图像特征等优点,研究了基于小波变换的目标识别方法.首先采用二次B样条小波滤波器组对样本图像进行小波变换,提取多尺度边缘,然后提取不变矩,以此作为图像的特征向量,最后应用小波神经网络进行分类识别.计算机仿真实验表明,该方法取得了较好的识别效果.     

一种改进的含噪图像边缘检测算法

数字图像边缘检测是图像分割、识别等图像分析和理解领域中的重要基础。针对图像边缘检测中噪声抑制与细节保留之间的矛盾,提出了一种基于小波变换和数学形态学改进的含噪图像边缘检测算法。该算法对含噪图像分别采取小波变换法和数学形态学法进行边缘提取,将所得图像进行小波分解,对高低频系数分别采取不同融合规则进行融合,通过逆小波变换得到融合图像。通过实验对比不同算法对含噪图像的边缘检测效果图,结果表明,该算法提取的图像边缘轮廓信息连续完整,在较大程度上能够抑制噪声,较好地保留了图像的细节信息。     

红外小目标小波多尺度相关检测方法

提出一种基于小波多尺度相关的目标检测方法.该方法通过二进小波对图像进行多尺度分析;利用边缘和噪声具有不同的Lipschitz指数造成它们的小波变换模在不同尺度下的不同传播特性,根据小波变换尺度相关性计算相邻大尺度模相关量用来增强信号,抑制噪声,提取粗略边缘图;并结合小尺度检测,具有定位精确的特点,将粗略边缘图与小尺度模图相与,寻找模极大值点,得到最终的检测结果.实验结果表明,该方法较传统的小波多尺度边缘检测方法能更加有效地进行红外小目标检测.     

基于形态学图像融合的目标检测方法

提出了一种新的海空背景下受强杂波、噪声污染的红外图像目标检测算法。采用多尺度的形态算子对输入的图像进行并行滤波，既抑制噪声又能提取目标边缘细节。对并行处理后的图像进行基于树状小波帧变换的图像信息融合。仿真实验表明，该算法要优于传统的小波、中值滤波算法，适用于舰载红外警戒系统。     

基于小波变换的目标边缘搜索分割方法

为满足目标识别实时性、抗噪声的要求,提出了利用小波变换的图像边缘搜索分割方法.用反对称双正交小波算子对图像进行小波变换,对小波变换模极大值进行启发式搜索检测边缘,得到目标边缘的链码表示.该搜索方法能较好地克服噪声干扰,边缘丢失时能通过在模值分布图中搜索找回边缘,增强算法的鲁棒性.实验结果表明,在同样平台下,使用该方法检测边缘能减少一般小波多尺度分析的计算量,计算速度与使用Sobel算子的梯度方法相当,且具有更好的抗噪声能力.该方法边缘连接良好率高,特征提取方便,综合提高了图像处理算法效率.     

基于Contourlet变换的红外弱小目标检测方法

介绍了存在背景干扰和噪声情况下的红外图像中弱小目标的检测问题,提出一种基于Contourlet变换的检测算法。首先对图像进行Contourlet变换,利用Contourlet分解后子图像的特性抑制背景和去噪声,最终实现对目标的检测。通过在含有随机目标的红外序列图像中的实验,并与小波变换进行比较,证明了算法的有效性。     

低信噪比红外图像的快速统计法边缘提取

现代成像制导中所使用的红外图像往往存在着噪声大、目标一背景间灰度差较小、边缘较模糊的特点。这些特点会增加边缘提取的难度，因此必须建立更有效的红外图像边缘提取算法以满足需要。针对这些问题，以噪声Gauss分布模型和噪声特征为基础，建立了新型统计学意义下的红外图像边缘检测法。通过对此方法的概率模型进行分析，可以证明在有较大噪声的情况下，只要边缘处的差分值大于一定的值。就能以较大的概率提取出图像边缘。通过在不同情况下与梯度法的抑噪能力进行对比和分析发现，统计边缘提取法的噪声抑制能力要高于梯度法。在与Sobel模板算子法的红外图像边缘检测结果进行仿真和对比后发现，统计法能对红外图像的目标边缘检测取得良好的结果，并且算法具有快速简单的优点。     

一种改进的基于小波变换的相干斑去噪方法

对于合成孔径雷达(SAR)图像中含有的相干斑噪声的抑制一直是SAR图像处理的热点和难点。相干斑噪声的存在对SAR图像的后续相关的图像处理,例如图像的分割、图像的特征提取以及目标的分类与识别有很大影响。提出了一种基于平稳小波变换的相干斑去噪方法,通过平稳小波变换对图像进行小波分解,对于子图像的高频区域进行阈值分割和双边滤波,利用平稳小波更好的冗余性和平稳不变性更好地去除了SAR图像的相干斑噪声。实验结果表明,这种改进的去噪方法对SAR图像的相干斑噪声抑制有很好的效果,并且尽可能地保留了图像的边缘和纹理细节。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NOTICE OF CHANGING JOURNAL OF ELECTRONICS （CHINA） TO MICROSYSTEMS ＆ NANOENGINEERING

正Journal of Electronics(China)(JE)was founded in 1984,sponsored by the Institute of Electronics,Chinese Academy of Sciences.JE is one of the first English academic journals in China in the field of Electronics and Information technology.The journal was published quarterly since it was launched in 1984 to 2003,then it is published bimonthly till now.During