envelope

说明：  matlab中最短路问题的算法，就是求从网格的起点到终点的长度（总权）最小的通路。 附注释(the shortest path problem in matlab algorithms, is seeking a starting point from the grid to the end of the length of (total) of the smallest channels. Annotated)

in this folder contains the Extract the files and to add the SIFT features.

Test Code hope it works, please correct the code

用matlab实现基于矩合并的图像分割（MUM，merge using moments),显著性水平0.2，起始样本个数4.(a realization of the MUM(merge using moments) using in image segmentation.noted that the significance is 0.2 and the beginning samples is 4)

传递矩阵法计算梁的横向振动频率，各种边界条件(Frequency calculate by TMM for beam vibration, free-free boundary conditions, simply supported)

《Matlab7.x系统建模与仿真光盘内容》源码，人民邮电出版社06年出版，学习simulink很好的例子( Matlab7.x System Modeling and Simulation CD-ROM content source, Posts )

彩色图像变成灰色图像，并对其进行直方图分析，二维直方图分析以及二维直方图的OTSU处理(Color images into gray image and its histogram analysis, OTSU processing of two-dimensional and two-dimensional histogram histogram analysis)

非下采样轮廓波变换，NSCT变换，主要用于图像去噪，效果非常不错(Nonsubsampled contourlet transform, NSCT transform, mainly for image denoising, the effect is very good)

共振解调的源代码，用于对滚动轴承的振动信号处理，并通过fft变换，进行故障诊断(Resonance demodulation source code for rolling bearing vibration signal processing and through the fft transform, fault diagnosis)

计算给定点列的曲线拟合最小二乘法得到的函数(The function of least square method for curve fitting of fixed point column)