Heavily optimized ContraharmonicMeanFilter.cs
Heavily optimized ContraharmonicMeanFilter.cs

I realized that I was recomputing the same values over and over again when
computing the denominator and numerator. I decided to memoize the results into
a numerator and denominator table ahead of time. This cuts the number of Pow
calls down to 512 instead of width * height * 2a * 2b.

DrItanium/ImageProcessingApplication