The guided filter is a technique for edge-aware image filtering. I implement fast kind of the guided filter as fast guided filter in Aforge.NET framework and use it to demonstrate how to usage in a sample C# code. I spend a couple of days to implementing 'Multiply', 'Divide', 'FastBoxBlur' and 'FastGuidedFilter' filters that's added to forked accord.net repository in Accord.Imaging namespace, while it's implemented on official OpenCV and Matlab.

Result of 'FastGuidedFilters' enhancement using AForge.Imaging.Filters.FastGuidedFilter class (Original image in left side and filtered on right side).