ifft2 on an asymmetric matrix does not work correctly?
조회 수: 2 (최근 30일)
이전 댓글 표시
I have a complex matrix of size 256x128. When I perform ifft2 the picture is folded across the y direction. The same ifft2 function works well on a symmetric matrix (128x128). Help
댓글 수: 0
답변 (1개)
David Young
2015년 1월 14일
ifft2 works correctly.
You can demonstrate this with the following code
img = rgb2gray(imread('peppers.png')); % example image
img = img(1:256, 1:128); % make it 256x128
img = double(img)/256; % double, scale to 0-1
imshow(img); % have a look
imgTrans = fft2(img); % transform
imgRestored = ifft2(imgTrans); % inverse transform
figure; imshow(imgRestored); % looks ok
There must be some other problem with the way you generate the 256x128 matrix.
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 Logical에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!