Purpose of ceil in fspecial

Question

Marium Malik 2012-8-29

0
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https://ww2.mathworks.cn/matlabcentral/answers/46978-purpose-of-ceil-in-fspecial

These are few lines from a code:

s=3;
M=imread('I.jpg');
I=rgb2gray(M);
%filter
h=fspecial('gaussian',ceil(4*s),s);

I need to know that what is the purpose of ceil in fspecial? What is it going to do?

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Answer 1

Image Analyst 2012-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/46978-purpose-of-ceil-in-fspecial#answer_57438

编辑：Image Analyst 2012-8-30

They wanted to specify s, and the second arg must be an integer. They could have done int32(4*s) or floor(4*s) but for whatever reason they chose ceil. They wanted it to be at least as wide as 4 std dev's with the requirement that it be an integer because it's a window size in pixels. As you can find in the help for ceil(), it rounds up to the next highest integer value.