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 2017-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/336477-i-am-trying-to-make-a-highpass-filter-manually-but-error-appears-in-line-6-saying-the-operation-or

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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Answer 1

hmi amid 2017-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/336477-i-am-trying-to-make-a-highpass-filter-manually-but-error-appears-in-line-6-saying-the-operation-or#answer_263875

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.