Geek asks and answers

Matlab image processing error

I am trying to find the Fourier transform of an image in matlab. I do this without a hep library function. The code:

clc;
clear;
N=128; 
a=imread('lena128','bmp');
zeros(N,N);
for m=1:N
    for n=1:N
        w(m,n)=(exp(-1i*2*pi/N))^((m-1)*(n-1));
    end
end
af1=(w*a);
af=((w*(af1.')).');

When compiling this program, the following error occurs:

??? Error using ==> mtimes
Complex integer arithmetic is not supported.
Error in ==> qn4 at 12
af1=(w*a);

When I use a = rand (1,128), instead of a = imread ('lena128', 'bmp'), I do not get this error. I searched the Internet and found similar problems. But there is no solution. Can anyone point out an error for me?

+3
source share
2 answers

imread , ( uint8, ). , . , MATLAB double float - .

,

a=double(imread('lena128','bmp'));
+6

imread uint8 - BMP. MatLab double. im2double.

a=imread('lena128','bmp');
a=im2double(a);
+4

More articles:


All Articles