-
degree
求连接矩阵各节点的度,度分布,以及有向加权网络的中介中心性(Demand given a network connection to the matrix of weighted out-degree of each node)
- 2011-05-23 03:03:40下载
- 积分:1
-
cooccurrencemaxtric
颜色共生矩阵的计算,速度很快,好还用,要自己写入输入算法(Color co-occurrence matrix calculation, very fast, good also with)
- 2011-06-05 09:54:13下载
- 积分:1
-
sift
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)
- 2012-05-25 15:31:16下载
- 积分:1
-
BPSK_Rayleigh
BPSK plotting function matlab code
- 2015-03-07 22:59:31下载
- 积分:1
-
FunCon
天线实频匹配法优化函数的构造,可扩大频带宽度,达到提高增益的效果(the function structure of the real frequency method)
- 2021-03-26 11:39:13下载
- 积分:1
-
BP
说明: 这是一个基于matlab的三层神经网络算法,赋予不同的向量可对权值进行训练(This is a three-layer neural network matlab-based algorithm can give different weight vector for training)
- 2010-01-06 19:36:01下载
- 积分:1
-
ModelforEDFAs
Analytic Model for Gain Modulation in EDFAs
- 2009-11-05 08:45:57下载
- 积分:1
-
matlab-program-design
matlab program design
- 2012-07-25 15:55:24下载
- 积分:1
-
zxecf
数据的最小二乘法拟合,曲线绘制,实用的MATLAB数据分析使用,适合大数据分析(Least squares fitting of data and curve drawing)
- 2018-08-22 20:06:49下载
- 积分:1
-
MATLAB7_wavelet
小波分析理论与Matlab R2007实现(Wavelet analysis theory and Matlab R2007 implementation)
- 2011-02-11 15:45:50下载
- 积分:1