基于目标增强的红外与可见光图像融合技术研究

针对红外和可见光图像融合算法中存在背景模糊和目标不清晰等问题,提出一种基于目标增强的红外与可见光图像融合算法。首先,利用均值滤波的方法获得透射率的粗估计,通过图像统计信息实现粗透射率的细化,依据大气散射模型实现红外图像的目标增强;然后,对目标增强的红外图像和可见光图像采用改进的Prewitt算子进行边缘检测,并将检测结果二值化,对边缘部分采用基于二值信息的融合规则,对非边缘部分采用比值加权分析的融合规则。实验结果表明,采用基于目标增强的图像融合算法不仅能凸显红外图像的目标信息,还能尽可能多的保留可见光图像丰富的细节信息,具有更好的视觉效果和更高的客观质量评价指标。     

自适应加权的总变分正则化图像超分辨率重建

在Farsiu提出的双边总变分正则化方法中,尺度加权系数和正则化参数为定值,在边缘、纹理区域,重建图像效果不理想。针对这个问题,提出了一种自适应加权正则化函数和正则化参数的重建算法,该方法利用图像局部结构信息控制权函数形状、带宽和正则化参数,使这些参数根据图像局部结构信息自适应地调整。对所提出的算法进行了仿真实验,实验结果表明,与传统的总变分重建方法相比较,该算法能更好地重建图像的纹理细节,重建图像的对比度高。     

自适应约束下的双边全变差正则化超分辨率重建

在经典的双边全变差( BTV)超分辨率重建中,加权系数和正则化参数的恒定性导致重建结果边缘保持能力受限。为此,提出了一种自适应约束的BTV正则化先验模型。算法首先定义了图像的局部邻域残差均值以区分当前像素属于平坦区域还是边缘区域;然后针对加权系数的不变性导致边缘削弱的问题,利用边缘方向和垂直边缘方向扩散性的不同,设计自适应权重矩阵;最后根据代价函数的极值问题推导出迭代公式,从而进行图像的超分辨率重建,重建过程中采用自适应的方法确定正则化参数,以便求得代价函数的全局最优解,提高了算法的鲁棒性。实验结果表明：与双三次线性插值法和经典BTV算法相比,该算法取得了更好的视觉效果和更高的峰值信噪比,更多地保留了图像的边缘细节信息。     

红外图像超分辨率重建技术研究

利用图像超分辨率重建技术可以在不改进硬件的情况下提升现有成像系统的图像分辨率。为提升红外图像质量,提出了一种基于NSCT变换与自适应正则化重建相结合的图像超分辨率重建算法。算法充分考虑了实际红外图像中噪声特点,利用NSCT变换特点在尽可能减少图像信息损失的条件下,对加性噪声与乘性噪声采用不同策略进行了抑制,并对预处理后的红外图像序列进行自适应正则化重建。实验结果表明本算法处理后的红外图像在主观视觉效果与客观指标上较传统图像处理方法均有改善。     

基于随机森林的红外图像超分辨力算法

为提高低分辨力红外图像的分辨力,提出了一种红外图像超分辨力算法。该算法训练2个随机森林模型：红外图像训练第1个模型、配准的多传感器图像训练第2个模型。采用自适应边缘提取算法提取红外图像与可见光图像的边缘,计算输入的低分辨力红外图像块与对应的高分辨力可见光图像块之间的相关系数。根据相关性选择合适的重建模型,用选择的模型重建高分辨力红外图像块,并整合为高分辨力红外图像。实验结果表明,与超分辨力随机森林算法相比,算法重建的高分辨力红外图像具有更高的客观指标,峰值信噪比(PSNR)平均提升了0.09 dB,并且获得更为清晰的主观视觉效果,更接近原始图像。     

基于二阶广义全变差的多帧图像超分辨率重建

图像超分辨率重建是图像处理领域的重要问题.本文将二阶广义全变差用于基于正则化的多帧图像超分辨率重建问题,构建了基于二阶广义全变差正则项的图像超分辨率模型.为了更好地保持重建图像的边缘和细节,采用图像空域自适应正则化参数,并针对该重建模型的非光滑性,给出了基于半二次正则化和交替方向法的求解算法.实验结果表明该模型和数值算法能够较好地提高图像的分辨率,同时可以较好地保持图像的细节信息.     

基于BTV正则项的图像超分辨率重建改进算法

文章在最大后验概率(MAP)随机正则化理论框架下,采用L1范数来构造数据保真项,同时为了更好的保持重建图像边缘,在结合双边滤波(BTV)正则项的基础上,提出了一种能有效利用图像梯度大小和方向信息的正则化模型.实验结果表明,此方法与L1范数结合BTV正则项经典算法相比,能更好的抑制噪声和保持边缘,且在视觉效果和客观评价两...     

采用自适应正则参数的超分辨率加权重建

采用L1(一阶)、L2(二阶)范数是当前较为流行的2种图像超分辨率重建算法。在对这2种算法的优缺点进行分析的基础上,提出了一种采用L1和L2范数混合加权的参数自适应双边全变差正则化重建算法,将正则化参数作为重建图像的一个函数。实验证明这种算法有很好的边缘保持和去除椒盐噪声的能力,重建图像的质量有显著提高。     

基于多尺度分解和显著性区域提取的可见光红外图像融合方法北大核心CSCD

可见光红外图像融合技术对于提升成像区域的信息丰富程度具有重要意义。提出了一种基于多尺度分解和显著性区域提取的可见光红外图像融合算法。利用边缘保持的图像平滑算法,构建了多尺度图像分解框架,将图像分解为不同尺度的基础层图像和若干细节层图像,同时结合导向滤波器,在每个分解图层实施显著性区域提取。通过加权重建进行融合信息的视觉增强,得到最终的融合结果。针对不同融合算法和图像库开展了主客观评价对比实验,结果表明:所提出的算法具有较好的主客观评价结果,算法融合效果表现优异,适用性较好。     

结合方向边缘检测的红外与可见光图像融合算法

针对现有红外与可见光融合算法中存在边缘模糊与目标不清晰等问题,通过对红外图像与可见光图像的研究,提出一种基于方向边缘检测的红外与可见光的图像融合算法。通过在传统的边缘检测算法基础上,引入一个方向因子,提出了一种新的方向边缘检测算法;并根据高频子带与低频子带中小波系数的不同特性,分别对其采用了不同的融合规则。实验结果表明,该算法能够有效的提取图像中的边缘信息与目标信号,具有可靠性高、清晰度高的市场优势。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

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.     

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.     

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.     

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.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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