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guided: guided filter useful to blur masks

this is a generic implementation of a guided filter. this version takes no shortcuts and uses both an input and a guided image.

connectors

• input the input image. to blur a mask, put the actual image here
• guide the guide image. to blur a mask, put the mask here
• output the output image

parameters

• radius the size of the blur, relative to the input resolution
• epsilon the edge threshold