How to apply Gaussian filter on images in MATLAB?

How to apply Gaussian filter on images in MATLAB?

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Wanbin Song]

You can use imgaussfilt function for 2-D gaussian filtering as below:

I = imread('mypic.jpg');
Iblur = imgaussfilt(I, 1);

where the second input of imgaussfilt is standard deviation sigma.

[Asad Ali Siyal]

Hi, Thanks for your reply. But I am getting this error when I am running above commands.

??? Undefined function or method 'imgaussfilt' for input arguments of type 'single'.

How to fix this ?

[Wanbin Song]

BTW, to use imgaussfilt, Image processing toolbox is required. The error message seems state that image processing toolbox is not installed.

[Image Analyst]

Alternatively, try conv2().

[anastasia]

How do you rotate the gaussian filter/kernel for different orientations? for example, for rotating the kernel in 12 different directions from -pi/2 to pi/2? Please help

[anastasia]

Any guidance on a similar question? @Image Analyst https://in.mathworks.com/matlabcentral/answers/327870-how-to-apply-directional-gaussian-filters-to-an-image

[Image Analyst]

You can use the rotation matrix https://en.wikipedia.org/wiki/Rotation_matrix