Clear Filters
Clear Filters

How to solve "Error using .* Matrix dimensions must agree."?

2 views (last 30 days)
My code is to use Hormomorphic filtering.But i am having an error like matrix dimension must agree.I read many answers related to this but I don't understand how to apply it to my code. My image resolution size is 1935*2400.Is it the problem or how can i solve this problem?
I = imread('cephalogram.bmp');
I = im2double(I);
I = log(1 + I);
M = 2*size(I,1) + 1;
N = 2*size(I,2) + 1;
sigma = 10;
%create the high-pass filter...
[X, Y] = meshgrid(1:N,1:M);
centerX = ceil(N/2);
centerY = ceil(M/2);
gaussianNumerator = (X - centerX).^2 + (Y - centerY).^2;
H = exp(-gaussianNumerator./(2*sigma.^2));
H = 1 - H;
imshow(H,'InitialMagnification',25);
H = fftshift(H);
If = fft2(I, M, N);
Iout = real(ifft2(H.*If));
Iout = Iout(1:size(I,1),1:size(I,2));
Ihmf = exp(Iout) - 1;
imshowpair(I, Ihmf, 'montage');

Accepted Answer

Walter Roberson
Walter Roberson on 20 Oct 2018
We do not know if your inage is rgb (3 dimensions) or grayscale (2 dimensions)
You construct H to be nearly twice the size of the image but you expect to be able to do element by element multiplication between the two.
  1 Comment
Nayana R
Nayana R on 20 Oct 2018
It is rgb image.I convert it to gray image and it worked.Thank you Walter Roberson.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

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

Start Hunting!