Dealing with Boundary conditions / Halo regions in CUDA

Question

I\'m working on image processing with CUDA and i\'ve a doubt about pixel processing.

What is often done with the boundary pixels of an image when applying a

Answer 1

A common approach to dealing with border effects is to pad the original image with extra rows & columns based on your filter size. Some common choices for the padded values are:

• A constant (e.g. zero)
• Replicate the first and last row / column as many times as needed
• Reflect the image at the borders (e.g. column[-1] = column[1], column[-2] = column[2])
• Wrap the image values (e.g. column[-1] = column[width-1], column[-2] = column[width-2])