How to I apply Gaussian filter on images in MATLAB?

How to I apply a 7 x 7 Gaussian blurr operator with standard deviation of 1.6 and downscaled by a factor of 3 ?

I tried to write this code but got error.

K = imread('baboon.png');

h = fspecial(K, 'gaussian',[7 7],1.6);

downSample = imresize(h, 0.33); % downSample by factor of 3

imshow(downSample);

How do i achieve this ?

Thanks

[Rawand Alkhdour]

https://www.mathworks.com/matlabcentral/answers/430031-how-to-i-apply-gaussian-filter-on-images-in-matlab#answer_476764 please help me

Answer 1

[Image Analyst]

You need to look at the documentation when the error say "too many arguments". Several of your arguments were wrong. Here is the fixed code:

rgbImage = imread('peppers.png');
kernel = fspecial('gaussian', [7 7], 1.6);
blurredImage = imfilter(rgbImage, kernel);
downSample = imresize(blurredImage, 1/3); % downSample by factor of 3 
imshow(downSample);

[Chidiebere Ike]

Thanks for the correction. I appreciate

[Rawand Alkhdour]

https://www.mathworks.com/matlabcentral/answers/430031-how-to-i-apply-gaussian-filter-on-images-in-matlab#answer_476764

Answer 2

[Rawand Alkhdour]

read the matlab built in peppers png and sharpen the coloured image in the frequency domain using gaussian high pass filter