基于温差扰动补偿的红外纹理生成新方法

针对传统红外视景仿真中红外纹理生成效果生硬,真实感欠缺的问题,提出了一种基于温差扰动补偿的红外纹理生成新方法。该方法以实测红外图像为数据源,模拟红外成像机理构建红外成像链路模型,解耦环境影响因素得到红外图像各像素点对应的温度值,通过建立的目标表面热平衡方程和一阶导热方程求解实测与仿真时刻表面温度均值,利用各点温度与实测时刻均值温度的差值求得表面温差扰动,最后对仿真时刻均值温度进行温差补偿,得到表面的预测温度分布,并将计算出的辐亮度数据存储为DDS(Direct Draw Surface)纹理格式,以提高纹理生成的实时性。实验结果表明,该方法充分考虑到真实红外数据源的可靠性,同时兼顾红外纹理生成效率,在红外视景仿真中具有较好的工程实用价值。     

一种基于图像纹理的模板匹配算法

为了提高实际工程应用中图像匹配算法计算的实时性,增强图像匹配算法对复杂场景跟踪的鲁棒性,提出了一种新的基于图像纹理的模板匹配算法(TTM)。依据邻域内像素灰度变化的趋势分别提取水平、垂直方向二值化的图像纹理矩阵,然后根据定义的一个相似性判别准则,分别度量水平、垂直两个方向二值化图像矩阵之间的相关置信度。最后,通过合成两个方向上的图像匹配置信度结果得到目标配准置信度。实验结果表明,该算法对图像光照变化、目标部分被遮挡等情况具有较好的适应性。     

一种新的综合颜色和纹理特征的图像检索方法

提出综合HSV颜色直方图和Gabor小波纹理特征进行检索的新方法,既利用颜色特征对图像颜色全局分布的描述,又利用纹理特征对局部空间信息的描述,避免一种特征描述图像的片面性。基于Corel库的检索实验结果表明,该方法可以取得良好的检索效果。     

A new method for microwave generation and data transmission using DFB laser based on fiber Bragg gratings

A novel architecture for microwave/millimeter-wave signal generation and data modulation using a fiber-grating-based distributed feedback laser has been proposed in this letter. For demonstration, a 155.52-Mb/s data stream on a 16.9-GHz subcarrier has been transmitted and recovered successfully. It has been proved that this technology would be of benefit to future microwave data transmission systems.     

A novel texture segmentation method based on co-occurrence energy-driven parametric active contour model

In this paper, a novel approach to texture segmentation based on the parametric active contour model (ACM) is proposed. At first, gray-level co-occurrence matrix and subsequently co-occurrence energy of the regions inside and outside of the dynamic contour are calculated. Difference of this energy corresponding to both the regions is used as the external energy of the proposed ACM. The contour stops and converges completely when this difference attains a maximum value. The proposed approach requires only initial contour selection and no object point selection like the other variants of parametric ACM used for texture segmentation. Experiments on a number of synthetic and real-world texture images show that in all cases, we are getting a better segmentation of the object although for few cases the execution time is bit more than that of other existing methods.     

A new key generation method for frequency-domain speech scramblers

This paper describes a method which uses “derangement” permutations as scrambling keys in a frequency-domain speech scrambling system. Subjective tests based on the number test confirm that such keys produce scrambled speech with virtually no residual intelligibility. A new derangement generation algorithm is introduced for key generation. This algorithm maps each integer g, in the range of 0⩽g<(n-1)!, to a distinct derangement of 2 elements,     

基于马尔科夫识别的敌我目标识别新方法

针对敌我识别系统在现代战争中的保密要求,提出一种将马尔科夫系统识别技术应用于敌我识别的新方法,每个发射机按照系统分配的转移矩阵发射随机码,接收机利用已知的不同我方作战单元的转移矩阵,判断码序列所属,实现我方目标的识别。与传统方法相比,发射机每次按照一定的转移概率发射服从马尔科夫分布的随机编码,大大提高了敌方截获和破译的难度,提升了系统的抗欺骗干扰性能。仿真结果表明,该方法在发射序列比较长的情况下,可以获得准确的识别结果。     

一种基于FGN和IDFT的自相似通信量生成算法

对网络模拟中必需的自相似通信量生成方法进行了研究,提出了一种基于分数高斯噪声(FGN,fractionalGaussiannoise)过程和逆离散傅立叶变换(IDFF,inversediscreteFouriertransform)的自相似通信量生成算法--FGN-IDFT算法,并通过仿真实验和比较分析的方法对该算法的精度和计算复杂度进行了大量的实验和分析。研究结果表明,利用FGN-IDFT算法生成的自相似通信量的精度和速度都令人满意,为实际网络模拟的进一步深入研究提供了基础。     

基于正交信号产生的方法比较

文中针对不同应用领域需要不同特性正交信号的问题,采用罗列比较的方法,通过具体电路的设计、制作、测试、分析、对比,得出了4种典型的正交信号产生方法及各自的优缺点。正交信号产生有4种典型的设计方案：单片机数字合成法,FPGA直接数字式频率合成器法,DDS集成芯片AD9851合成法,RC—CR相移网络法。文中介绍了这4种正交信号产生方法的具体原理并对各方法在幅值调节,频率调节范围,正交性等方面做了详细的对比,以便在不同设计要求下选择相应的设计方案。     

A generation method of insulator region proposals based on edge boxes

High-quality insulator region proposals play important roles in the process of transmission line inspection images. A generation method of insulator region proposals based on edge boxes is proposed in this paper, and edge boxes are applied to the localization of insulators in inspection images creatively. We take a series of operations to generate insulator region proposals:K-means cluster is used on curvature scale space (CSS) points extracted from edge images, the most appropriate cluster number is chosen, and the circle is drawn on the insulator subclass. We consider the characteristics of insulators’ edge images, and combine these characteristics with edge boxes. As a result, more insulator region proposals are displayed. The experimental results show that our method can effectively reduce the interference area, meanwhile, has high quality of region proposals with fast calculation speed.     

基于堆栈降噪自动编码模型的动态纹理分类方法

针对以往动态场景分类中需要手动提取动态特征描述符以及特征维数过高的问题,提出利用深度学习网络模型进行动态纹理特征的提取。首先利用慢特征分析法(SFA)预先学习每个视频序列的动态特征,将该特征作为深度学习网络模型的输入数据进行学习,进一步得到信号的高级表示,深度网络模型选用堆栈降噪自动编码模型,最后用SVM分类法对其进行分类。实验证明该方法所提取的特征维数低,并且能够有效地表示动态纹理。     

基于时间—顶点谱图小波变换的动态纹理分类方法

动态纹理在空间和时间上表现出"外观"和"运动"属性,为了有效结合这两种属性进行动态纹理分析,本文提出一种基于时间—顶点谱图小波变换与边缘分布协方差模型的动态纹理分类方法.该方法将动态纹理看成时间—顶点图信号,利用时间—顶点谱图Meyer小波变换对动态纹理进行多尺度分解,再对每个子带应用边缘分布协方差模型,由此得到带内相...     

A new process-variation-immunity method for extracting capacitancecoupling coefficients in flash memory cells

Overestimation of capacitance coupling coefficients in flash memory cells is encountered in the subthreshold slope method. By means of a two-parameters subthreshold current model I_D=I₀ exp[q(V_GB - nV_SB)/nkT], a mathematical formulation of the subthreshold swing ratio in the subthreshold slope method is constructed to isolate the measurement errors caused by process variations from the errors traditionally caused by bulk capacitance coupling. To minimize the effect of process variations, a new method is developed based on the model. In this method, the control gate voltage shift due to weak body effect is measured in flash memory cells in subthreshold, while the corresponding slope factor n is adequately deduced from threshold voltage versus source-to-substrate bias measurement in dummy devices. The corrected capacitance coupling coefficients show large improvements compared to the design values, and the updated errors are found to be close to that caused solely by bulk capacitance coupling. The method is also fast since only a small source-to-substrate bias of 0.1 V is needed for implementation of weak body effect, and thereby it can be used as an in-line monitor of capacitance coupling coefficients     

一种产生相干超短光脉冲的简易方法

利用短耦合腔半导体激光器的直接调制,产生脉宽为17.8ps,边模抑制比达38dB的相干超短光脉冲,脉冲峰值功率达130mW。     

一种通信协议测试序列生成的新方法

本文讨论了一种协议测试的新方法,它使用构造类别代数述通信协议规范,然后根据规范中的公理部分生成测试序列。本文以栈规范为例介绍这种方法的应用。并通过与基于有限状态机的测试序列生成方法相比较,得出两种方法在一些方面是等效的,但在处理状态较多的协议时,这种方法有一定的优点。     

非降采样Contourlet图像边缘检测算法

介绍了非降采样Contoudet变换(NSCT)的结构特点与系数分布特性,并提出了基于NSCT的图像边缘检测算法,实现了对图像高频边缘的有效去噪和提取.该方法具有多向选择性、高低频信息并行检测、信息利用率高、两类边缘相互补偿修正精确定位及抗噪声干扰能力强等特点.通过仿真实验并与Prewitt、Sobel、Canny及多尺度小波边缘检测算法进行比较,验证了该方法的有效性和优越性.     

一种基于稀疏矩阵的指纹识别新方法

为了实现对指纹识别速度上的需求,对指纹算法做了较深入的探讨和分析,提出一种新的指纹匹配算法,该算法将稀疏矩阵应用到指纹匹配当中,根据稀疏矩阵计算速度快和存储容量小的特点,使得指纹匹配速度在一定程度上得到了提升。通过实验结果表明,本文算法在指纹图像增强和匹配速度方面有很大的提高,同时也降低了计算机的内存消耗。     

基于GMPLS的新一代网络流量工程

当前互连网业务量增长迅猛，未来的骨干网必须处理巨大的IP数据流量和实时数据流量，巨大业务流量要求提高网络资源利用率，实时数据流量要求确定的服务质量。为此，未来网络的结构和技术需要新的解决方案。本论述流量工程对新一代网络的重要性，并且讨论用GMPLS解决流量工程问题的途径。     

一种基于高阶Markov使用模型的测试用例自动生成方法

为了解决基于单纯马尔可夫使用模型测试用例生成不稳定、测试充分性判定不精确的问题,在分析现有测试用例自动生成方法的基础上,提出一种改进的高阶马尔可夫测试模型,并依据此模型,提出改进的基于快速轮盘赌的二分查找测试用例生成方法和基于相对熵的测试充分性判定方法。实践表明,改进后的方法有效地提高了测试用例生成的稳定性和测试充分性判定的精确性,与原有方法比较更适合大规模软件的测试,提高了大规模软件自动化测试的效率。