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Bessel
Bessel低通滤波器特性幅频及相频特性分析及其阶跃响应和方波响应(Bessel low-pass filter characteristics of amplitude and phase frequency characteristics of frequency and step response and the square wave response)
- 2010-05-22 08:59:57下载
- 积分：1
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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
- 积分：1
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matlabLMS
该程序实现时域LMS算法，并用统计的方法仿真得出不同步长下的收敛曲线(Implementation of the procedure time-domain LMS algorithm, and simulation statistics do not come under the simultaneous convergence of a long curve)
- 2009-04-03 04:37:45下载
- 积分：1
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MATLABfunction
MATLAB_主要函数指令表(功能)MATLAB_主要函数指令表(功能)MATLAB_主要函数指令表(功能)MATLAB_主要函数指令表(功能)(The main function of MATLAB_ instruction table (feature))
- 2012-06-10 20:39:24下载
- 积分：1
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jpg2rgb565_matlab
实现将jpg格式的图片转换为rgb565格式并按照16进制格式存储在txt文档中，网上很难有其他相关的程序，matlab编写经过实际验证很好用(Achieve the jpg format images converted to rgb565 hexadecimal format and stored in accordance with the format in txt document online is difficult to have other related procedures, matlab write-proven good use)
- 2014-09-06 14:53:21下载
- 积分：1
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RS_encod_decod
说明： 自从发表《RS纠错编码原理及其实现方法》以来，收到很多初识RS编码的读者的来信，
大家纷纷表示这篇文章对初学者很有帮助，但同时也指出了很多不足。比如第一版的例子中都是按照码长 ，
但在实际应用中并不总是这种情况，还有就是MATLAB程序，由于作者在工程中是在DSP上用C实现的，
所以文章中的MATLAB程序只是用来说明问题，并没有经过调试。做事应该有始有终，这次修改，
附有详细的经过调试的MATLAB程序。并尽量做到程序具有通用性。(Since the publication of RS error-correcting coding theory and method, since the RS coding acquaintance received a lot of letters from readers, we have expressed this article helpful to beginners, but it also points out the many deficiencies. For example, the case of the first edition are in accordance with the code length, but in practical applications is not always such a situation, there is a MATLAB program, because the author works in the DSP using C to achieve, so the article in MATLAB program is used to describe the problem and not debug. Things should stay the course, this changes with the detailed procedures after debugging MATLAB. And as far as possible the procedures are inter-operable.)
- 2008-11-18 16:08:13下载
- 积分：1
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1
说明： 常规AM调制：画出调制前波形图和频谱图
求已调信号功率、噪声功率等(Conventional AM modulation: Draw modulation waveform and spectrum before seeking modulated signal power, noise power, etc.)
- 2010-06-25 14:29:37下载
- 积分：1
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ccfir
在数值微积分中讨论并比较了没有初等函数解析式情况下的
定积分数值逼近的(Discussed in the numerical integration and compared the analytic situation is not under the primary function of integral numerical approximation of the rectangular method, trapezoidal method, Simpson' s method and Coates law)
- 2010-05-19 15:20:53下载
- 积分：1
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Fractal
用matlab实现分形的绘图，可以达到对分形的进一步了接(Using matlab to achieve fractal drawings, fractals can be achieved for a then further)
- 2011-10-01 17:20:27下载
- 积分：1
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gx-try
主成分分析法在数学建模中的应用
使用主成分分析法的matlab 编程(Principal component analysis in mathematical modeling using principal component analysis method matlab programming)
- 2013-08-23 14:06:21下载
- 积分：1
