How do I use a highpass filter?

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Esa Soudbakhsh
Esa Soudbakhsh 2021-1-31
回答： Sindhu Karri 2021-2-4
I don't see any option to do so with the fspecial() function. I looked at the information of highpass() on mathworks and I was confused about the inputs. So far I have this and it produces an error.
A = imread('landscape.jpg');
B = imresize(A, [256 256], 'Antialiasing', true);
E = highpass(1, pi/2);
G = imfilter(B, E);
imshow(G);

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回答（1 个）

Sindhu Karri
Sindhu Karri 2021-2-4
Hii,
For 'highpass' function the parameters to be passed should be normalised so highpass(0,0.5) won't be producing an error
Refer to link:
https://www.mathworks.com/help/signal/ref/highpass.html
you can also refer to the below link for additional information on applying highpass filter to an image
https://www.mathworks.com/matlabcentral/answers/13125-how-do-i-use-imfilter-to-high-pass-filter-an-image

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