cimg.limit.openmp()
#The following stencil defines a neighbourhood that
#includes the next pixel to the left (delta_x = -1) and the next pixel to the right (delta_x = 1)
stencil <- data.frame(dx=c(-1,1),dy=c(0,0))
im <- as.cimg(function(x,y) x+y,w=100,h=100)
get.stencil(im,stencil,x=50,y=50)
#A larger neighbourhood that includes pixels upwards and
#downwards of center (delta_y = -1 and +1)
stencil <- stencil.cross()
im <- as.cimg(function(x,y) x,w=100,h=100)
get.stencil(im,stencil,x=5,y=50)
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