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1下载：
利用matlab实现图像的频域滤波，包括巴特沃斯低通、理想低通、高斯低通等-Using matlab for image filtering in frequency domain, including the Butterworth low-pass, ideal low-pass, Gaussian low-pass, etc.
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matlab下实现降噪，功率谱计算。％程序中设定采样点数为256个，采样频率为10000hz，
％输入信号为随机噪声和两个正弦的合成信号
％设定的滤波器的截止频率为3500hz
％通过挈比雪肤滤波器，运行程序，比较滤波前后的频域波形
％滤波去除了高频信号-matlab achieve noise reduction, power spectrum calculation. Sampling procedure set for 256 points, the sampling f
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各种频域的滤波函数，包括低通，高通，带通，同态滤波。-Various frequency domain filter function, including low-pass, high pass, band-pass, homomorphic filtering.
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％ y=filter(sig,fmin,fmax)
％ 对信号进行理想滤波，可完成低通，带通
％ sig为被滤波信号
％ fmin为下限频率，当fmin为0时为低通滤波器，当fmin>0时，为带通滤波器
％ fmax为上限频率，fmax>fmin
％ fs为信号的采样频率
％ y为经过滤波后的信号
-％ Y = filter (sig, fmin, fmax)％ of the ideal signal filtering, to be com
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给定一幅图像，进行频域处理，包括低通滤波，图像锐化，伪彩色处理等。-Given an image, the frequency domain, including low-pass filtering, image enhancement, pseudo-color processing.
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* Frequency domain filtering
-1. Discrete Fourier Transform
Write a C++ function for each of following:
(a) Multiply the input image by (-1)x+y to center the transform for filtering.
(b) Compute the two-dimensional discrete F
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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
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FILTERING IN FREQUENCY DOMAIN, FFT of Average Filter -FILTERING IN FREQUENCY DOMAIN, FFT of Average Filter
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The File Contains 5 Other Source Codes include, bandpass Butterworth Filter, Gabor Bank, RGB to HLS Conversion, Image Filtering in Frequency Domain and Hough transform.
I hope that s enough to make me a member.
Regards.
Zizi.
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信号分析与处理中的频率域数字滤波程序，包括带通和带阻滤波-Signal analysis and processing of frequency-domain digital filtering program
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图像处理中的频域滤波，对图像处理的初学者很用用的啊！-Frequency domain filtering in image processing, image processing for beginners with the use of ah!
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对图像cat的频域滤波 将图像转换为频域后滤波在转回时域图形 完成效果较好-Cat image filtering in frequency domain into the frequency domain image filtering in the back after the completion of the time domain is better graphics
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用matlab编写的在频域的图像平滑处理的代码，包括几个算法，简单易懂-Using matlab image smoothing frequency domain code, including several algorithms, easy to understand
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用频域的方法进行带通滤波，很实用的例子，程序框图清晰；-Bandpass filtering in frequency domain, very practical examples, clear program flow chart
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visual c++写的傅里叶变换，以及在频域实现低通滤波和高通滤波(Fourier transform written by visual c++ and low-pass filtering and high pass filtering in frequency domain)
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MATLAB教学视频：傅里叶变换的频域滤波详解(MATLAB teaching video: Fourier transform filtering in frequency domain)
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The reason for doing the filtering in the frequency domain is generally because it is computationally faster to perform two 2D Fourier transforms and a filter multiply than to perform a convolution in the image (spatial) domain. This is particularly
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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
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Image Restoration(Filtering in the Frequency Domain)
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傅里叶谱与频域低通滤波 (a)从图书网站下载图4.41(a)并计算其(居中)傅里叶谱。(b)显示频谱。(c)在等式(4.8-7)中实现高斯低通滤波器。您必须能够指定结果2D函数的大小，M x N。此外，您必须能够指定高斯函数的中心位置。(d)从图书网站下载图4.41(a)，并对其进行低通滤波，以复制图4.48中的结果。(Fourier Spectrum and Lowpass Filtering in Frequency Domain
(a) Download Fig. 4.41(a)
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