How do I use a highpass filter?

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);

Answer 1

[Sindhu Karri]

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