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lvboqqqqqqq
- 于傅里叶变换的图像加密技术研究 具体是将一幅图像用 fft 变换到频域 在频域中进行加密 我考虑的是通过随机相位来加密的方法，请问用matlab怎样实现 加密后在通过 ifft 得到加密后的图象 -Fourier transform in the image encryption technology to study the details of an image is to use fft transformed to the frequency doma
GaborFilter
- 本程序实现了Gabor滤波器的三维显示并对一幅图像通过频域卷积实现了1个尺度6个方向的Gabor滤波显示
dft_hp_filt
- 用于频域滤波的m函数，接受输入一幅图像和一个滤波函数，输出经滤波和剪切后的图像。还有一个高通滤波函数。-For frequency domain filtering m function, to accept the importation of an image and a filter function, the output cut by the filtering and image. There is also a high-pass filtering function.
GaborFilter
- 非常直观的Gabor小波滤波程序，有不同波长滤波效果比较；同时能反应相频幅频的变化结果-A very impressive Gabor Wavelet Filter program. It contains comparison of different filter results. Moreover, it could reflect changes of phase and amplitude.
ppfxy
- 频谱分析仪，相位变化 ，幅频变化 ，功率谱波形-Spectrum analyzer, phase changes, amplitude and frequency changes, power spectrum waveforms
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- 将一幅256*256的图像分成8*8的小块，对其进行DFT变换。分别比较在空间域和频域内对源图像进行二次抽样和差值最后比较不同-1. Get a grey level image which size is N*N. (For example, 256*256, however, N = ), and partition to 8*8 sub images. 2. Apply DFT to these sub images, and get the fourier transfor
filter
- 用MATLAB实现频域平滑滤波以及图像去噪代码6. 计算频率域图像的幅值并进行对数变换，利用’imshow’ 显示频率域图 像； 7. 在频率图像上去除滤波半径以外的数据(置0)； 8. 计算频率域图像的幅值并进行对数变换，利用’imshow’ 显示处理过的 频域图像数据； -6. Calculate the frequency domain image of the amplitude and logarithmic transformation, using imsh
Image-Enhancement
- 交换两幅图像的相位谱，利用频域滤波消除周期噪声！-Exchange of two images of the phase spectrum, using frequency domain filtering periodic noise elimination!
shiyan4
- (一) 离散时间系统函数： 1、 自行设计某离散时间系统函数，至少是二阶的系统，画出零极点图，判断系统的稳定性。 2、 求出单位样值响应，并画出图形。 3、 求出系统的幅频响应和相频响应，并画出图形。 -(A) discrete-time system function: 1, to design a discrete-time system function, at least second-order system, draw the pole-zero diagram, d
noise-clear-for-image
- 傅里叶变换的源代码，用于图像去噪。 用傅里叶变换将每个颜色的信息转化为同等长度的幅频和相频的信息 将序列中幅频相频的高频段部分置零 反向傅里叶变换还原到BMP数据中-Fourier transform of the source code for image denoising
Sine-signal-superposition
- 分别画两个频率不同的正弦信号及他们叠加的信号,y1、y2及他们的叠加信号进行采样,进行傅里叶变换,幅频图,频谱图-Videos two sinusoidal signals of different frequencies, and their superimposed signal, Y1, Y2 and their superimposed signal to be sampled, the Fourier transform, amplitude and frequency diagram
segmented-function
- 分段函数，进行采样，画出采样图，幅频图，频谱图-Piecewise function, sampling draw sample Figure Figure amplitude-frequency spectrogram
DFT-and-DCT-transformations
- 二维离散傅里叶变换和离散余弦变换同属于图像的二维正交变换，它们在图像处理中有 着极为重要的应用价值。利用这些正交变换可以获得图像的频域信息，从而实现图像的增强、复原、编码和描述。本文将描述对图像进行DFT 和DCT 变换的过程。在进行DFT 变换后，还会将图像的幅频、相频特性进行置换操作后反变换，并探讨其中的规律；而在DCT 变换后，还将探讨如何选取DCT 系数点以实现图像的复原。请先阅读压缩包内的pdf文档。-This code implements the DFT and DCT tra
matlab
- 巴特沃斯滤波器，主要实现的是低通信号，此功能模块的低通曲线很符合理想的幅频特性。-Butterworth filter, the main achievement is low traffic numbers, the low-pass curve is consistent with this function module ideal frequency characteristics.
1
- 绘制一幅人像或风景图像的幅频图及相频图,并由幅频图及相频图重建空间域图像.(使用fft2,ifft2,fftshift函数)-Draw a portrait or landscape image amplitude-frequency and phase-frequency diagram in Figure by the amplitude-frequency and phase-frequency diagram in Figure spatial domain image reconstr
Upingxiang
- 桨叶嵌入式液弹吸振器，是一种新型的桨叶减摆器，该函数功能是求桨叶在一阶激励频率下的幅频响应，-Liquid bomb embedded blade vibration absorber, is a new blade damper, the function function is seeking an order in the blade under the excitation frequency amplitude-frequency response,
cvgabor
- 生成gabor变换的5尺度八方向滤波器，结果为三维的幅频特性曲线。(The five - scale eight-direction filter for gabor transform is generated)
fft
- 主要是FFT计算傅里叶变换的幅频特性函数文件(The main is the amplitude frequency characteristic function file of FFT calculation Fourier transform)
直方图均衡化
- 压缩包内包含两个m文件，一个是直方图均衡化，另一个是频域滤波，即对一幅图像进行低通、高通滤波，并且使用高频强调和直方图均衡相结合的方法增强图像；另外包含了四张测试用的图片。(Compressed packet contains two m files, one is histogram equalization, the other is a low pass filtering in frequency domain, i.e., images of a high pass filter, a
幅频特性曲线
- 求给定函数的幅频特性曲线，给定区间进行画图。(Given an analog signal, it is converted to digital signal, calculated by FFT, and the amplitude frequency characteristic curve is drawn.)