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Gaussian High Pass Filter

Asked by lina on 27 Jul 2013

Hello, I try to apply Gaussian High Pass Filter function

a=imread('img'); figure(1) imshow(a) [m n]=size(a); f_transform=fft2(a); f_shift=fftshift(f_transform); p=m/2; q=n/2; d0=70; for i=1:m for j=1:n distance=sqrt((i-p)^2+(j-q)^2); low_filter(i,j)=exp(-(distance)^2/(2*(d0^2))); end end filter_apply=f_shift.*low_filter; image_orignal=ifftshift(filter_apply); image_filter_apply=abs(ifft2(image_orignal)); figure(2) imshow(image_filter_apply,[])

but I got this error

??? Error using ==> times Matrix dimensions must agree.

can someone help me




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1 Answer

Answer by Youssef KHMOU on 27 Jul 2013
Edited by Youssef KHMOU on 27 Jul 2013
Accepted answer

hi lina,

I tried your program and it works fine, replace the first command with :


I think the error you get is due to the nature of the sample you use, maybe its RGB image, if so you need to change it to grayscale image or process each channel individually, try this as first attempt :



lina on 27 Jul 2013

Well done thank you brother :)

elfrida on 13 Aug 2013

if format of my picture is .jpg, can I use this program? or I must convert to .tif??? thankyou

Image Analyst on 13 Aug 2013

No, that has nothing to do with it. No matter what format the image is stored in on disk, once imread gets done with it, it's just a regular array of numbers.

Youssef  KHMOU

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