Unsharp Mask with NPP not Working

I am trying to figure out how to use the nppiFilterUnsharpBorder_8u_C1R() function to sharpen an 8bpp monochrome image, but all it seems to do is blur images slightly. I have tried a variety of values for the various parameters, but nothing seems to work. Is this function intended to actually produce a sharpened image as the documentation suggests? Can someone point me to a good example of how to use it?

Thank You


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I am using CUDA/NPP ver 9.1, and my computer has a GeForce GT 750M display adapter.