dual-tree

主成分分析 （ Principal Component Analysis ， PCA ）或者主元分析。是一种掌握事物主要矛盾的统计分析方法，它可以从多元事物中解析出主要影响因素，揭示事物的本质，简化复杂的问题。计算主成分的目的是将高维数据投影到较低维空间。给定 n 个变量的 m 个观察值，形成一个 n ′ m 的数据矩阵， n 通常比较大。对于一个由多个变量描述的复杂事物，人们难以认识，那么是否可以抓住事物主要方面进行重点分析呢？如果事物的主要方面刚好体现在几个主要变量上，我们只需要将这几个变量分离出来，进行详细分析。但是，在一般情况下，并不能直接找出这样的关键变量。这时我们可以用原有变量的线性组合来表示事物的主要方面， PCA 就是这样一种分析方法。(Principal component analysis (Principal Component Analysis, PCA) or PCA. Is a statistical method to grasp the principal contradiction of things, it can be resolved diverse things out the main factors, revealing the essence of things, simplifying complex problems. The purpose of calculating the main component of high-dimensional data is projected to a lower dimensional space. Given n variables of m observations, forming an n ' m of the data matrix, n is usually large. For a complex matters described by several variables, it is difficult to know, so if you can grab something to focus on key aspects of analysis? If the main aspects of things just reflected on several key variables, we only need to separate out these few variables, for detailed analysis. However, in general, does not directly identify this critical variables. Then we can represent the major aspects of things with a linear combination of the original variables, PCA is one such analysis.)

说明：  批量提取遥感影像数据，以如何在一个文件批量读取geotif数据为例(Batch extraction of remote sensing image data)

海思图像调节方法和工具，很基础同时也很重要。(This document instructs debugging personnel to adjust the picture quality and implement differentiated adjustment.)

改进的有效边表算法，来自计算机图形学的简单代码(Improved active edge table algorithm, a simple code from the computer graphics)

运用本征模式匹配理论研究了声子晶体实际的声学速度沿两个高度对称的方向上的第一布里渊区里的特性。(The effective acoustic velocity along two highly symmetric directions of the first Brillouin zone is studied in a two-dimensional squarely arranged solid-solid phononic crystal.)

Richardson-lucy去噪算法，泊松去噪(image denoising use Richardson lucy algorithm)

双目摄像机标定程序，给出摄像机内外参数，并完成三维立体重建。(Binocular camera calibration procedures, given internal and external camera parameters, and complete the three-dimensional reconstruction.)

说明：  结构光光平面标定源码，注释详细，求出光平面在相机坐标系中的相对位置。(Structured light plane calibration source code, detailed comments, find the relative position of the light plane in the camera coordinate system.)

说明：  最小二乘滤波图像复原程序，用真实的PSF函数和噪声强度作为参数，可以运行(Least-squares image restoration filtering process, with the real PSF function and the noise intensity as a parameter, you can run)

由多光谱图像的3个波段构成的RGB分量经IHS变换后，可将图像的空间特征(，)和光谱特征(H、S)分离(From multi-spectral image consisting of three-band RGB components by the IHS transform, may be characteristic of the image space (,) and spectral characteristics of (H, S) Separation)