Local Binary Pattern (LBP) proposed by Ojala T is a typical texture analysis algorithm. It is widely used in the texture classification domain and etc. In this paper, we consider the local pixels’ effects among them efficiently when the LBP algorithm is used. In our proposed LBP algorithm, the central pixel in the local region was added into the procedure to calculate the local threshold using the Niblack algorithm. The histogram equalization is always used to actualize the illumination invariability in LBP algorithm. But the histogram equalization can not avoid the variety of local grayscale caused by the illumination. In order to avoid this weakness, a kind of illumination factor is brought into the Niblack algorithm. The values of the illumination factor can be got adaptively with the changes of illumination. By using the improved Niblack algorithm, the local threshold can be calculated adaptively. The proposed LBP algorithm in this paper can get more texture information and it has illumination adaptability.

This paper presents an analog circuit fault diagnosis framework, called OCB-SBT (one-class classifier based SBT). In OCB-SBT, one-class classifiers as many as predefined fault classes are constructed from their corresponding fault simulation samples. And they serve the role of fault dictionary and classifier. This approach is simple for Go/NoGo testing because it requires only no-fault circuit simulation samples to provide the result. It will also provide "unknown fault" result if the testing object lies outside the boundary of training data, and bring "or" combined result when the testing sample belongs to the overlapped area among different fault classes. Fault diagnosis example shows that the proposed method is robust and reliable to the effects due to not only component tolerances and nonlinearity but also poorly defined fault classes and low testability.

A current-soure inverter with variable frequency is proposed for the grid-connected photovoltaic generation system in order to improve power quality, reduce current harmonics and decrease the frequency of switches. Besides applying energy to grid in the form of alternative current output using full-bridge switches, this topological structure can also complete maximum power point tracking by changing the duty ratio. The variable frequency current-source switch is controlled by PWM algorithm, and it is proved by computer simulation.

The localization algorithm in wireless sensor network is always a hot spot. Information collected by the sensors is meaningless without the position of the sensors. Now, paying little attention to 3-D space, most of the algorithms are for 2-D space. In this paper we introduce a novel algorithm for 3-D space called OBS (Optimal Beacon Selection) algorithm. In this algorithm we launched the concept of position error parameter, with consideration of communication range and position accuracy of beacon. The experiment results show that this method can minimize the accumulation error and improve the location precision.

为了加速实现长序列的线性卷积，提出了用快速哈达玛变换（FHT）实现线性卷积的快速算法。分析了哈达玛变换的特点和快速算法的时间复杂度，设计了用FHT计算线性卷积的矩阵表达式，并推导出了哈达玛域滤波器的增益矩阵的求解公式，分析了该方法的加速原理及其适用条件。理论分析和实验表明，该方法比FFT线性卷积法快了近一倍。