Fourier transform with 2D imagesb
|Last edited: 2024-6-14
创建时间
Jun 13, 2024 08:37 AM
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Fourier transform

The fast Fourier transform (FFT) is a fast algorithm for computing the discrete Fourier transform. − MATLAB has three functions to compute the DFT:
  1. fft -for one dimension (useful for audio)
  1. fft2 -for two dimensions (useful for images)
  1. fftn -for n dimensions
MATLAB has three related functions that compute the inverse DFT:
  1. ifft
  1. ifft2
  1. ifftn
流程梳理：
  1. 图像读入，预处理，例如大小等
  1. 傅里叶变换（变为256*256是附加在fft的）
  1. 功率谱

Image decomposition: filtering

使用不同的频域操作，分离低频、中频和高频图像
notion image