i am trying to make a highpass filter manually but error appears in line 6 saying " the operation or expression "(" has no evident effect " what can i do ?

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Ahmed Eweed
Ahmed Eweed 2017-4-21
评论： Ahmed Eweed 2017-4-21
img=imread('cameraman.tif');
ftrans=fft2(img);
ftrans=fftshift(ftrans);
%[m,n]= size(256,256);
highpassfilter=ones(256,256);
highpassfilter(128-30:128+30,128-30:128+30);
smoothed=ftrans.*highpassfilter;
out=ifft2(smoothed);

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hmi amid
hmi amid 2017-4-21
Hi Ahmed, I think you should assign the values highpassfilter(128-30:128+30,128-30:128+30) to something. You are just outputting values of highpassfilter(128-30:128+30,128-30:128+30) into Ans which does not do anything. Maybe : highpassfilter(128-30:128+30,128-30:128+30)=0; ? Amid.

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