In order to improve the accuracy and computational efficiency of change detection of multi-temporal remote sensing images,a change detection algorithm based on nonsubsampled contourlet transform (NSCT) and independent component analysis (ICA) is proposed.The flexibility of NSCT in image decomposition and the effectiveness of ICA in image separation are used comprehensively.Firstly,multi-scale decomposition of remote sensing images is performed by NSCT.Then the decomposed low-frequency components and high-frequency components form into partitioned vectors.ICA is carried out for the partitioned vectors and separates mutual independent components.Next the separated components are transformed into image components which include the change image.Finally,change detection result is achieved by threshold segmentation and filtering of the change image.The experimental results show that,compared with the algorithm based on ICA,the algorithm based on wavelet transform and ICA,the proposed algorithm separates change information more effectively and reduces computational complexity.The obtained change image has higher accuracy and stronger robustness to the background.

关键词：变化检测;多时相遥感影像;独立分量分析;电子信息

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Aiming at welding defect image with complex background and low contrast,a segmentation method of welding defect image based on exponential cross entropy and improved pulse coupled neural network (PCNN) is proposed.Firstly,the area of weld is extracted by gray projection algorithm.Then,link weighted matrix and dynamic threshold function of PCNN are improved.Finally,the exponential cross entropy is calculated as criterion to determine the number of iteration for improved PCNN and get the optimal segmented image.The experimental results are given.Compared with the threshold segmentation method based on exponential cross entropy,the segmentation method based on PCNN and Shannon entropy,the proposed method can achieve better segmented results.

关键词：焊接缺陷检测；图像分割;指数交叉熵;脉冲耦合神经网络；电子信息

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Projectors are devices that project images, usually on a projection screen or any given surface. Traditional projectors are bulky and heavy devices and users found it difficult to carry them around. Pico projectors, on the other hand, are tiny, lightweight , next-generation devices that provide users with easy portability. There are two types of pico projectors: standalone and embedded.

关键词：微型投影机；便携式；头盔式显示器

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Segmentation of defect images is an important step in the automatic fabric defect detection.In order to extract fabric defects effectively,a segmentation method of fabric defect images based on pulse coupled neural network (PCNN) model and symmetric Tsallis cross entropy is proposed.The image is segmented by PCNN according to the gray strength difference between fabric defect area and non-defect area.To guarantee that the grayscale inside the object and background is uniform after segmentation,symmetric Tsallis cross entropy is used as the image segmentation criterion to select the optimal threshold and iteration number.A large number of experimental results show that,compared with the related segmentation methods such as Otsu method,PCNN method,the method based on PCNN and cross entropy,the segmentation effect of the proposed method is the best.The texture of non-detect area is removed more completely,and the defect area is segmented more accurately.

关键词：织物疵点检测；图像分割；脉冲耦合神经网络；电子信息

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An advanced detector based on the dual frequency IP method was designed to solve the speed unmatched problem between the detection and excavation.The detector consists of the transmission module and the receiving module.This paper designed the circuit of the transmission module with the Proteus software and completed the control program with the Keil software.Through the co-simulation of the circuit and the control program,the transmission waveforms designed were obtained and the system proved available,which laid the foundation for the development of the transmission module of the detector.

关键词：先进的检测；传输模块；变形杆菌；协同仿真设计；电子信息

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In a long time,the specialists in underwater acoustic countermeasure field were used to get an approximate evaluation of the transmission loss of noise signals by spreading loss equation of spherical wave,which led to results with a low accurateness.Based on normal mode theories and discrete Fourier transformation (DFT),derived the composition and process of the broadband acoustic propagation model.Then the transmission loss could be calculated via this propagation model,which could get a relatively more accurate result.The influence of three key positional parameters,the orientation,distance and depth of the noise-jammer were studied in this paper.The method and conclusions in this paper can provide a reliable foundation for tactical research on noise-jammers.

关键词：正常模式；宽带声传播模型；噪声干扰；电子信息

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An image sensor is a device that converts an optical image into an electronic signal. It is used primarily in camera modules, digital cameras, smartphones, and other imaging devices. In the past, analog sensors were used in video camera tubes.

关键词：智能手机；图像传感器；光学图像

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The phased array strapdown radar seeker's detecting information is coupled with missile attitude information.Hence,the measurement information can not be used for proportional navigation directly.The method of reconstructing inertial line of sight (LOS) rate in phased array strapdown seeker is presented using the missile-target relative motion geometric and filtering algorithm.Considering measurement noise and nonlinearity of the phased array strapdown radar guidance systems,the principle of unscented kalman filter (UKF) is introduced to estimate LOS rate.The simulation results show that the reconstruction method is correct and the extraction of LOS rate is effective.

关键词：相控阵捷联导引头；视线角速率重构； UKF；电子信息

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OLEDs are diodes that use organic materials to produce light. The organic material is packed between conductors that are lit up when electricity is passed through them. OLED display units contain many thin films of several types of organic molecules that produce various colors of light. Unlike LCDs, OLEDs do not require backlights and filters because the light emitted is bright enough for display. OLED display units include multiple layers of organic films depending upon the device's requirements. The Global OLED Display market is nearing commercialization and is expected to grow at a CAGR of 36.7 percent during the forecast period.

关键词：OLED；有机材料；光二极管；电流

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Automated material handling is the automation that eliminates the need for manual labor to sort, organize, retrieve, and move materials from one place to another.

关键词：自动化材料处理；组织；检索；优化；加速

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