基于MRF的复杂背景下缓动目标分割方法

提出了一种基于MRF的复杂背景下缓目标分割方法.该方法采用基于逆向光流场的背景抑制技术和基于加权直方图的灰度场建模方法.前者对相邻视频图像进行逆向光流变换使得两帧图像中的目标投影对齐,进而对两帧图像进行差分运算并设定阈值分离目标和背景,得到了较为完整的缓动目标初始分割;后者对初始标号场各像素分配信任度,进而统计信任度并建立加权灰度直方图,而后依据加权直方图建立了准确的图像灰度模型.在此基础上,在MAP-MRF框架内对视频图像进行分割.进行仿真实验并采用空间准确度和时间一致性标准评价实验结果,证明算法具有有效性和鲁棒性.     

基于Prewitt 算子的自适应弱小目标检测

针对工业现场中复杂背景下镁熔液弱小目标实时检测的难题,从图像识别的角度提出了基于Prewitt算子的自适应背景预测算法。该算法首先使用Prewitt算子对原始图像进行处理从而计算出图像最大灰度差,其次根据最大灰度差与每个像素点的灰度差的差异选择背景预测模型进行处理得到背景预测图像,然后用原始图像减去背景预测图像得到残差图像,接着对残差图像作帧差运算以及阈值分割运算得到二值图像,最后使用形态学运算获取最终的目标,并将该算法与最小一乘法的检测性能进行对比。Matlab仿真结果表明,该算法不仅可检测到弱小目标,并且检测到的目标点面积增大了60%,检测时间减少了96.92%,为图像处理技术应用于工业现场实时检测镁熔液中弱小目标奠定了基础。     

实时视频的清晰度检测算法研究

本文针对实时视频的清晰度检测问题．提出了一种基于背景提取、背景更新与点锐度算法相结合的方法。采用帧差法获取背景图像．然后对背景图像采用基于区域的选择性背景更新的方法对背景图像进行背景更新,并且将点锐度算法进行改进后应用于实时视频的清晰度检测。实验结果表明．此方法具有良好的检测效果．计算速率可以满足系统实时性的要求。     

一种基于灰度相关性的背景更新算法

视频运动目标检测常用的方法是背景差分法,而背景差分法的关键是如何从视频中建立背景模型。IIR滤波器背景更新算法是采用较多的一种背景更新算法,但仍存在一些不足,因此,本文提出了一种基于灰度相关性的背景更新算法,并使用差分图像像素均值法获取阈值对图像进行分割,用基于形态学及连通性分析法对检测目标进行后处理。实验结果表明:该算法能够实得到的背景帧较为理想,能对运动目标进行准确的检测,具有很好的鲁棒性。     

低秩稀疏分解下多尺度积的运动目标检测方法

针对基于矩阵分解的运动目标检测方法易受自然场景中背景的小幅抖动和摄像头抖动等因素影响的问题,提出了一种利用多尺度积的低秩稀疏矩阵分解算法。算法假设,静态背景视频序列中,每帧图像背景可近似视为处于同一低秩子空间中,图像前景则可视为偏离低秩空间的残差部分。首先对图像序列进行滤波、仿射变换等预处理得到视频序列观测数据矩阵;然后对数据矩阵进行低秩稀疏分解得到序列图像的低秩背景部分和每帧图像的稀疏前景部分;最后对稀疏前景部分采用小波变换模极大值与多尺度积方法检测目标边缘,并进行形态学处理,得到准确的运动目标。实验结果表明,算法检测到的运动目标清晰、完整,能有效地处理光照变化、摄像头小幅度抖动、图像背景局部小幅度变化等情况下的运动目标检测。      

基于时域和空域混合的低信噪比视频降噪算法及其分析

论述了几种基于时域和空域混合的对低信噪比视频图像进行降噪处理的算法.考虑单独使用时域或空域降噪算法对视频图像进行处理的缺点和不足.在时域上,由于视频图像帧与帧之间有较强的相关性,采用递归加权算法;在空域上,分别采用第二代Curvelet变换理论的Wrap算法( Wrapping-Based Transform)、全变差...     

基于高斯背景建模的目标检测技术

研究了室内环境下的运动目标的检测技术。讨论了各种目标检测的算法,提出基于室内相对静止背景下的目标检测算法,利用高斯背景建模方法提取较为理想与"干净"的背景帧,并可进行背景的自适应更新,然后再利用所得的背景与当前视频帧进行相减,得到视频中运动目标的前景图像,经过平滑去噪处理得到较为理想的目标检测效果。     

背景渐变的视频对象分割算法研究及实现

提出了一种有效的背景渐变的视频对象分割算法.首先将前一帧分成前景和背景两部分,然后采用灰度投影匹配算法对当前帧进行全局运动估计和补偿,将当前帧与上一帧进行差分运算,便可得到差分图像.通过对差分图像进行二值化处理,得到运动模板并与前景信息进行相与计算,再结合当前帧信息便可得到运动目标.在TI公司的TMS320DM642芯片上验证了该算法,实验结果表明该算法不仅对亮度变化和环境变化具有鲁棒性,而且可独立、精确地分割出运动目标.     

视频序列中运动目标检测与跟踪方法研究

提出了一种从摄像头获取的彩色图像中准确地检测出运动目标并进行实时跟踪的算法。首先将采集到的彩色视频图像序列转化为灰度图像,研究了几种图像锐化方法并进行了比较。然后进行帧间差分和阈值分割,成功分离出运动目标。最后采用投影法得到运动目标的大小及位置。实验结果表明,提出的运动目标检测与跟踪方法简单、有效、实时性高。     

基于嵌入式的新型运动目标视频检测算法

提出一类新型的嵌入式视频活动目标检测算法,该算法采用Surendra算法对背景进行更新以减低系统误报警的几率,对连续3帧图像分别采用差帧法,对2次帧差取交集实现对前景目标的模糊跟踪,而后对粗糙的运动区域图像进行阈值面积消去处理和数学形态学运算,最后实现目标定位跟踪。仿真结果表明,与传统的二阶帧差的方法相比,视频活动的目标检测算法具有高实效,高精度的特点。     

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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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.