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03607_28
DFT进行频谱分析时的三种现象
1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。
采样前加低通滤波器防混叠
2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。
改用其他窗函数（非矩形）改善泄漏。
3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。(DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.)
- 2007-05-08 16:22:17下载
- 积分：1
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kmanes2
k means clustering algorithm new 2 cluster
- 2013-11-04 05:00:43下载
- 积分：1
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beta2impact
这段代码利用分步傅里叶方法求解非线性薛定谔方程的matlab程序(This code solves the NLS equation with the split-step method)
- 2013-12-12 02:33:37下载
- 积分：1
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chuizhi
说明： 根据人脸与背景相比的高亮度，在垂直方向上截取人脸，用matlab来实现(Compared with the background under the face of high brightness, the vertical intercept in the face, using matlab to achieve)
- 2010-04-10 13:06:34下载
- 积分：1
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PSO_Prung
PSO capacitors placement in distribution system
- 2013-04-23 00:17:02下载
- 积分：1
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LMS_matlab
LMS算法matlab实现，可以进行验证(LMS algorithm matlab realize)
- 2012-11-13 20:56:00下载
- 积分：1
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dctcode
hide message inside image and retrive it from image using dct
- 2014-02-05 14:27:57下载
- 积分：1
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afiwvncs
包含位置式PID算法、积分分离式PID，GPS和INS组合导航程序，可以实现模式识别领域的数据的分类及回归，预报误差法参数辨识-松弛的思想，车牌识别定位程序的部分功能，正确率可以达到98％。(It contains positional PID algorithm, integral separate PID, GPS and INS navigation program, You can achieve data classification and regression pattern recognition, Prediction Error Method for Parameter Identification- the idea of relaxation, Part of the license plate recognition locator feature, Accuracy can reach 98 .)
- 2016-03-10 18:56:37下载
- 积分：1
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wbalance
Matlab程序，实现了一种新的色彩白平衡算法。 针对物体在有色光源照射下呈现偏色的现象,提出一种改进的LoG边缘自动白平衡算法。该算法在YCbCr空间的Cb和Cr分量上同时利用LoG算子提取边缘,利用LoG边缘具有零交叉特性直接得到边缘两侧的像素。为了避免占主导的彩色纹理造成干扰,利用白色区域的偏色信息进行边缘抑制。利用得到彩色边缘对原图的偏色进行有效的估计,最后计算三颜色通道的增益并进行白平衡。对大量图片进行了实验,结果表明该算法对不同色光照射下的图像均能很好地进行白平衡,同时与多种白平衡算法的对比实验表明该算法适应面广,性能良好。
(Matlab program implements a new color white balance algorithms.)
- 2009-10-21 16:33:34下载
- 积分：1
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LBM-two-phase
格子BLOTZMANN方法，两相流 matlab程序(Lattice BLOTZMANN method, two phase flow matlab program)
- 2021-03-12 16:49:24下载
- 积分：1
