=== Device Memory Management ===

To get a blurred pixel the surrounding pixels must be sampled, in some cases this means sampling pixels outside the bounds of the image. In the original, a simple if check was used to determine if the pixel was outside the bounds or the image, if it was a black pixel was returned instead. This if statement most likely would have caused massive thread divergence in a kernel, therefore the images created in device memory featured additional padding of black pixels to compensate for this. Two such images were created, one to perform horizontal blur and one to perform vertical blur. Other small device arrays were also needed to store the Gaussian integrals that are used to produce the blurring effect.

=== Host to Device ===

To copy the pinned image to the device an array of streams was used to asynchronously copy each row of the image over. Doing so allowed the rows to be easily copied over while avoiding infringing on the extra padding pixels.