MATLAB: Error using .* Matrix dimensions must agree on line I_f1=I_f.*(H_em) i didn’t understand how to remove this bug.

matrix dimension

[f1,f2] = freqspace(size(J), 'meshgrid' ); D = sqrt(f1.^2 + f2.^2); H_b=1./((1+0.1./D).^2); %Butterworth high-pass filter H_em=0.5+0.75*H_b; %High frequency emphasis filter H_em=ifftshift(H_em); % Perform filtering in frequency domain

I_f=fft2(J); I_f1=I_f.*(H_em); I2=uint8(ifft2(I_f1)); imshow(I2); histeq(I2);

Best Answer

Ensure that I_f and (H_em) having the same size. Analyze(size) of one by one line, you will get the error.

Note

[f1,f2]=freqspace(n) returns the two-dimensional frequency vectors f1 and f2 for an n-by-n matrix.

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This would be much easier to solve if you included the full error text. But, I suspect the problem is here:

function H = hpfilter(type,PQ(1); PQ(2), D0, n)

you have ; instead of ,

function H = hpfilter(type,PQ(1), PQ(2), D0, n)

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Hi Briyahna,

Yes the Simpson's rule expression is wrong, but only in the typo sense of having a misplaced parenthesis. Instead of

CS=(1/3)*(f(a) + 2.*sum(f((a + 2*h):2*h:(b - 2*h)))+4.*sum(f((a + h):2*h:(b -h))  +f(b)))*h;
it should be
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Even better would be to have (h/3) in front as per the usual Simpson expression rather than the h factor hiding all the way at the end.

Best Answer

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