Code for a picture to apply filters in frequency domain to it.

34 次查看（过去 30 天）
Amy Peterson
Amy Peterson 2021-10-17
回答： Prachi Kulkarni 2021-10-20
Apply the following filters to any image you prefer in the frequency domain. a. Average filter b. Gaussian filter c. Sharpening filter d. Sobel filter
  • To do that: Find the FFT transform of the image,
  • Find the FFT transform of the filter (you need to extend the size of the transformed filter so that it’s becomes same as transformed image size)
  • Pointwise Multiply the transformed image and transformed filter.
  • Find the inverse FFT transformation of the filtered image.
  • For every filter give the following: o Original image and its FFT transform o Filter and its FFT transform o Filtered image in frequency domain o Filtered image in spatial domain.
I have tried to figure out this code multiple times, and nothing seems to be working. If someone could help me on this, that would be amazing and I would be forever greatful!

请先登录，再回答此问题。

回答（1 个）

Prachi Kulkarni
Prachi Kulkarni 2021-10-20
Hi,
Please refer to the following example for a sample code.
I = imread("cameraman.tif"); % image of size 256x256
I = im2double(I);
F = fspecial("average",3); % average filter of size 3x3
Ipad = padarray(I,[3-1 3-1],0,"post"); % zero padding
Fpad = padarray(F,[256-1 256-1],0,"post"); % zero padding
Ifft = fft2(Ipad);
Ffft = fft2(Fpad);
Offt = Ifft.*Ffft;
Opad = ifft2(Offt);
O = Opad(2:end-1,2:end-1); % remove padding

类别

在 Help Center 和 File Exchange 中查找有关 Image Filtering 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by