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Matlab_Advanced
共五章matlab实现计算机辅助设计与仿真技术的ppt讲义。还有每一讲中所有的m源程序，很方便自学。(a total of five chapters Matlab computer-aided design and simulation technology ppt overhead. Each also stresses all of the m source, is a convenient self-study.)
- 2007-04-24 22:55:22下载
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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
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nf821
小波包分析提取振动信号中的特征频率，基于负熵最大的独立分量分析，多抽样率信号处理。( Wavelet packet analysis to extract vibration signal characteristic frequency, Based on negative entropy largest independent component analysis, Multirate signal processing.)
- 2017-05-22 21:28:24下载
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EXP04
ARITHMETIC and LOGICAL OPERATION of images
- 2009-03-19 23:48:08下载
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dtcwtPbicubic
dtcwt and bicubic based image resolution enhancement
- 2012-10-02 18:18:33下载
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Lorenz
Lorenz 吸引子三维相空间图，这里用四阶 Runge-Kutta 法得到微方程的离散序列(Lorenz Runge-Kutta)
- 2009-05-11 19:16:54下载
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matlabchazhnh
函数逼近与曲线（面）拟合
种插值方法
数值微分
解线性方程组的直接方法(Function approximation and curve (surface) fitting kinds of interpolation method, numerical micro-decomposition of the direct method of linear equations)
- 2010-01-08 23:44:17下载
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SVG_Export_of_Figures
Converts 3D and 2D MATLAB plots to the scalable vector format (SVG).(Converts 2D and 3D plots to the MATLAB scala ble vector format (SVG).)
- 2007-04-05 19:36:55下载
- 积分：1
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ofdm
ofdm系统源代码（包括qam调制、加噪、判决)(ofdm system modulation, noise, judgment)
- 2014-01-16 21:44:47下载
- 积分：1
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Chenmh_LIB
Frequently used algorithms for numerical analysis and signal processing(Frequently used for numerical algorithms analysis and signal processing)
- 2007-01-27 01:17:38下载
- 积分：1
