1.6 尺度不变特征提取

电压跌落是最严重的动态电能质量问题之一， 精确定位电压跌落起止时间是应对电压跌落问题的 重要前提和基础。由于电压采样信号往往有噪声分 量，现有的方法在定位电压跌落的起止时间时存在 局限性。本文提出利用多小波变换及相邻系数去噪 的电压跌落定位方法。多小波兼有对称性、正交性、 有限支撑性和二阶消失矩等优异的信号处理性能， 利用GHM多小波可以准确定位电压跌落起止时间。 多小波变换系数在每层之间具有对应关系，多小波 相邻系数将紧相邻的若干个系数作为一个整体来确 定阈值，考虑了系数之间的相关性，能获得更好的 去噪效果。通过 Matlab 进行仿真验证，仿真结果表 明，所提出的方法的正确性。 (Voltage sag is one of the most serious dynamic power quality problems. Critical start-time and end-time are important indices for voltage sags. But the sampling signals often have noisy component, the locations of start-time and end-time are hard to get. Wavelet is an effective tool for those non-stationary signal processing and has been used in this field. Local feature in the signal can be enlarged after the transformation using the scalar wavelet. But scalar wavelets cannot contain orthogonality, symmetry, compact support and higher order of vanishing moments simultaneously. In this thesis, multi-wavelets GHM is used to detect and locate power quality disturbances. Multi-wavelets offer many excellent properties such as the same approximation order but more compact support. The dependence of the multi-wavelets coefficients varies with the level, so neighboring coefficien)

opengl图形实现，非调用函数直接构图，初级参考学习不错(opengl graphic realization, non-call direct mapping function, the primary reference to learn good)

说明：  matlab编写的直线检测算法，能够有效的提取出直线。和matlab自带的hough变换实现的同样的功能(matlab prepared in a straight line detection algorithm can effectively extract the straight line. And the hough transform matlab own to achieve the same function)

说明：  一个画箱型图的代码，按照里面的数据格式将数据添加进去就能画箱型图，体量小，但很实用(A drawing box diagram code, according to the data format will be able to add data to draw box diagram, small volume, but very practical)

根据输入的色坐标自动计算出色域,并标注在CIE-1931色度图上.(Automatically calculate based on the input color coordinates of the gamut, and marked in the CIE-1931 chromaticity diagram.... )

说明：  能够实现对一幅图像的最近邻、双线性、双三次三种插值(Can realize the nearest neighbor, bilinear and bicubic interpolation of an image)

说明：  基于YCbCr椭圆模型，使用肤色进行人脸检测(use the skin color to detect human-face base on YCbCr modal)

进行基于绝缘子边缘检测与提取,能识别绝缘子裂纹的故障,通用性蛮好(Insulator-based edge detection and extraction, to identify cracks insulator failure, versatility fine)

matlab的图像压缩代码，适合初学者，算法比较简单(Matlab image compression code for beginners, the algorithm is relatively simple)

取阈值常用的方法有：双峰法、迭代法、大津法（OTS(threshold for commonly used methods : bimodal, iteration, Tianjin (OTS. )