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# This is R source code for function 'diffLCK' in the R
# package 'image'.
# Creator: Yicheng Kang
# Date: April 26, 2013
diffLCK <- 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(C_lck_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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