Direct3D Rendering Cookbook

Implementing box blur using separable convolution filters

So far we have implemented some simple color manipulation techniques. Now we will create an image blur effect using a filter kernel. This technique will make more effective use of the compute shader thread groups by utilizing group shared memory and thread synchronization. Convolution filters can be used to apply a wide range of image processing effects, and among these effects, a number of them are separable, meaning that a 2D filter can be split into two 1D filters: the first representing the horizontal aspect of the filter, and the second representing the filter to be applied to the image vertically. These two 1D filters can then be processed in any order to produce the same result as ...