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# This is R source code for function 'diffLLK' in the R
# package 'image'.
# Creator: Yicheng Kang
# Date: April 29, 2013
diffLLK = function(image, bandwidth, plot = FALSE){
if (!is.matrix(image))
stop("image data must be a matrix")
n1 = as.integer(dim(image)[1])
n2 = as.integer(dim(image)[2])
if (n1 != n2)
stop("image data must be a square matrix")
if (!is.numeric(bandwidth))
stop("bandwidth must be numeric")
if (as.integer(bandwidth) < 1)
stop("bandwidth must be a positive integer")
if (length(bandwidth) != 1)
stop("bandwidth must be a positive integer")
if (n1 + 2 * bandwidth + 2 > 600)
stop("bandwidth is too large or the resolution
of the image is too high.")
n1 = dim(image)[1]
z = matrix(as.double(image), ncol = n1)
k = as.integer(bandwidth)
out = .Fortran('llk_diff', n = as.integer(n1 - 1), obsImg = z,
bandwidth = as.integer(k), diff = z)
if (plot == FALSE)
return(out$diff)
else x = seq(0, 1, length = n1); y = x
image(x, y, out$diff, col = gray((0:255)/255))
return(out$diff)
}
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