NDtw ==== Dynamic Time Warping (DTW) algorithm implementation for .NET C# Features ==== * Single or multivariate * Data preprocessing options (none, centering, normalization, standardization) * Optional weights for variables

Most optimization problems in real life applications are often highly nonlinear. Local optimization algorithms do not give the desired performance. So, only global optimization algorithms should be used to obtain optimal solutions. This paper propose

SIFT（Scale-invariant feature transform）是一种检测局部特征的算法，该算法通过求一幅图中的特征点（interest points,or corner points）及其有关scale 和 orientation 的描述子得到特征并进行图像特征点匹配，获得了良好效果.-SIFT (Scale-invariant feature transform) is a local feature detection algorithm by finding a pictu