title: How to use Mat.ForEachAsDouble method in OpenCVsharp
body: <p>I'm trying to evaluate the ForEachAs method in OpenCvsharp, but I'm not sure how to use the method. </p>
  
  <p>I have loaded a gray scale image into a Mat type. I then try to use the ForEachAsInt16 method on this image. The ForEachAsInt16 metod takes a MatForeachFunctionInt16 operation as input. So I need to instantiate a function pointer (delegate) of this type. How do I do that?</p>