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This document introduces the techniques of fast Fourier transform and gives a source code in C for computing 2D FFT on image data.
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This document contains information about frequency domain processing. details about 1-d,2-d fourier transform,inverse fourier transform,image enhancement techniques. contains some sample code and output also
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使用C++开发的，1D和2D的快速傅里叶变换程序-The use of C++ development, 1D and 2D fast Fourier transform procedure
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C实现 快速傅立叶变换FFT FFT-1D FFT-2D 源代码 第一部分-C to achieve the first part of the Fast Fourier Transform FFT FFT-1D FFT-2D source code
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本文档介绍了快速傅里叶变换的技术，并给出了C++语言中用于计算图像数据的二维FFT的源代码。(This document introduces the techniques of fast Fourier transform and gives a source code in C for computing 2D FFT on image data.)
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二维的离散傅立叶变换，写的比较简单，没有给出demo(Two-dimensional discrete Fourier transform, writing is relatively simple, did not give demo)
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线性低通滤波器最常用的是线性平滑滤波器，这种滤波器的所有系数都是正的，也称邻域平均。邻域平均减弱或消除了傅立叶变换的高频分量，对噪声的消除有所增强，但是由于平均而使图像变得更为模糊，细节的锐化程度逐渐减弱。
下面使用不同的平滑模板对图像进行滤波：（二维线性滤波fliter2）(The most commonly used linear low-pass filter is the linear smoothing filter, which has all the positive coeff
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