How do I generate a two dimensional Fourier Transform with a given image in a .mat file?

F = fftshift(F); % Center FFT
F = abs(F); % Get the magnitude
F = log(F+1); % Use log, for perceptual scaling, and +1 since log(0) is undefined
F = mat2gray(F); % Use mat2gray to scale the image between 0 and 1
imshow(F,[]); % Display the result

Regards

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

sean darmadi 2015-3-9

Hi, I am given a mat file called A.mat. So I am assuming I need to first open the file first. So i wrote,

fid=load('A.mat');

After that, I am not sure what to do with the opened file. I am confused on how to use the fft2 function cause every time I tried it says undefined function 'fttn' for input arguments of type 'struct'.

Am I doing something wrong?

请先登录，再进行评论。

Answer 2

Image Analyst 2015-3-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/182306-how-do-i-generate-a-two-dimensional-fourier-transform-with-a-given-image-in-a-mat-file#answer_170683

Attached are two of my FFT2 demos for you.

2 个评论
显示无隐藏无

sean darmadi 2015-3-9

Hi,

I am just given a file in the .mat format. When I try to do ftt2, I am unable to convert the file. When I use the load function, it says that I have a 300x300 double.