randomsample

1 SIFT 发展历程 SIFT算法由D.G.Lowe 1999年提出，2004年完善总结。后来Y.Ke将其描述子部分用PCA代替直方图的方式，对其进行改进。 2 SIFT 主要思想 SIFT算法是一种提取局部特征的算法，在尺度空间寻找极值点，提取位置，尺度，旋转不变量。 3 SIFT算法的主要特点： a) SIFT特征是图像的局部特征，其对旋转、尺度缩放、亮度变化保持不变性，对视角变化、仿射变换、噪声也保持一定程度的稳定性。 b) 独特性(Distinctiveness)好，信息量丰富，适用于在海量特征数据库中进行快速、准确的匹配[23]。 c) 多量性，即使少数的几个物体也可以产生大量SIFT特征向量。 d) 高速性，经优化的SIFT匹配算法甚至可以达到实时的要求。 e) 可扩展性，可以很方便的与其他形式的特征向量进行联合。 4 SIFT算法步骤： 1） 检测尺度空间极值点 2） 精确定位极值点 3） 为每个关键点指定方向参数 4） 关键点描述子的生成 本包内容为sift算法matlab源码(1 SIFT course of development SIFT algorithm by DGLowe in 1999, the perfect summary of 2004. Later Y.Ke its description of the sub-part of the histogram with PCA instead of its improvement. 2 the SIFT main idea The SIFT algorithm is an algorithm to extract local features in scale space to find the extreme point of the extraction location, scale, rotation invariant. 3 the main features of the SIFT algorithm: a) SIFT feature is the local characteristics of the image, zoom, rotate, scale, brightness change to maintain invariance, the perspective changes, affine transformation, the noise also maintain a certain degree of stability. b) unique (Distinctiveness), informative, and mass characteristics database for fast, accurate matching [23]. c) large amounts, even if a handful of objects can also produce a large number of SIFT feature vectors. d) high-speed and optimized SIFT matching algorithm can even achieve real-time requirements. e) The scalability can be very convenient fe)

some introduction of matlab

自己写的MATLAB的防射变换的程序。请多多指教(Write your own MATLAB Anti-shot transformation process. Requests the exhibitions)

使用MATLAB对DSB-AM进行仿真：双边带幅度调制的过程以及对其中所包含的对信号的频谱分析都可以通过MATLAB中的M语句及相关函数来实现。假如信号m(t)=cos(m)以dsb-am方式调制载波c(t)=cos(20*pi*t),所的信号为y(t)，并将采样频率定为 fs=100Hz,则可在MATLAB中设计程序对该幅度调制的结果进行仿真，绘制已调信号波形和频谱分析。(It is a example for DSB-AM based on MATLAB .)

本程序是雷达SAR图像算法的经典程序集合，包含波数域算法，RD算法和CS算法，对于学习SAR成像非常有帮助(This procedure is a SAR radar image of the classic algorithm collection procedures, including the wave number domain algorithm, RD algorithm and CS algorithm for SAR imaging study very helpful)

Code source Of Automated Fingerprint Identification System

this is the simulation of the four generator system which is based on the K.r.Padhiyar book the load flow data and the line data is taken from this buk..... the students those are new in the simulation in matlab can refer this simulation and work on this ......

说明：  高斯噪声下的64QAM调制的误码率检测与理论值比较(Gaussian noise 64QAM modulation of the error detection rate compared with the theoretical value)

齿轮形状可调，可分布不同齿形，大大节约作图时间，希望大家支持改进(The gear shape adjustable spread toothed significant savings plotting time, I hope you will support improved)

非常详细的Capon算法DOA估计程序，自己写的，毕业设计，保证结果正确且可以运行。有非常详细的注释，每句话都有注解，简明易懂，保证可以看懂并学到知识，并且每一步与Capon算法详细的对应和算法解释，不管是学习程序还是学习算法都很有帮助，.m文件中是程序的一部分，全部代码在WORD中，肯定是你见过的最好的代码(Capon algorithm very detailed procedures for DOA estimation, he has written, graduate design, to ensure accurate results and can be run. Very detailed notes, every word has a comment, simple to understand, to ensure you can read and acquire knowledge, and each step corresponds with the Capon algorithm and the algorithm explained in detail, whether it is learning process or learning algorithms are very helpful ,. m file is part of the process, all the code in WORD, certainly the best you' ve seen the code)