MATLAB: How does the imgaussfilt function handle the first and last pixels of a row or a column

Question

I'm using the imgaussfilt function to smooth an image and was wondering how the algorithm handles the beginning and the end of a row or a column to get the right values?

Answer 1

By default, the edge values are padded by replication, but you have control over that through the ''Padding'' input parameter.

Note that it's not just the first/last row/column that is affected. Any pixel within half a kernel width of the image border will need to use padded values.