用VB做监控程序时，有时需要把采集到的数据以曲线的形式显示出来，下面是对此进行的介绍

This code is described in \"Computational Geometry in C\" (Second Edition), Chapter 7. It is not written to be comprehensible without the explanation in that book. This program reads a polygon P followed by query points from stdin. The in

K-L变换算法 以矢量信号X的协方差矩阵Ф的归一化正交特征矢量q所构成的正交矩阵Q，来对该矢量信号X做正交变换Y=QX，则称此变换为K-L变换（K-LT或KLT），K-LT是Karhunen-Loève Transform的简称，有的文献资料也写作KLT。可见，要实现KLT，首先要从信号求出其协方差矩阵Ф，再由Ф求出正交矩阵Q。Ф的求法与自相关矩阵求法类似。-K- L

中值滤波程序，其时间复杂度与窗口的大小无关；具有常量时间复杂度；-Median filtering procedures, the time complexity is independent of the size of the window with constant time complexity