neidandao

说明：  MATLAB 讀取 ESRI 檔 AND SETIING X Y (MATLAB RREAD ESRI FILE AND SETIING X Y)

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)

Travaux pratique Analyse numérique MATLAB

LEACH (Low Energy Adaptive Clustering Hierarchy) is designed for sensor networks where an end-user wants to remotely monitor the environment. In such a situation, the data from the individual nodes must be sent to a central base station, often located far from the sensor network, through which the end-user can access the data.

通过引入7种加权函数实现信号中的时延估计，为广义互相关法(By introducing seven kinds of weighting functions for signal delay estimation, generalized correlation method)

说明：   地面水平运动下，用振型分解法解动位移响应 地面水平运动下，用振型分解法解动位移响应( On the ground level of movement, using the modal decomposition method solution of dynamic displacement response of horizontal movement of the ground, using modal decomposition method solution of dynamic displacement response of)

说明：  小波域数字水印嵌入程序。 实现对数字图像进行水印嵌入和检测。(Digital watermark embedding in wavelet domain. Implementation of digital image watermark embedding and detection.)

说明：  自己写的一个基于肤色模型的人脸检测的matlab代码。( I write a face detection based on skin color model with matlab.)

matlab认知无线电 能量检测 在不同采样点数的情况下，信噪比和检测概率的变化趋势比较。(Matlab Cognitive Radio, energy detection, in the different sampling numbers, the SNR and the probability of detection varing.)

声音识别程序，MATLAB程序，很好的例子，可以一看(Voice recognition program, MATLAB program, a good example, can one see)