Description Usage Arguments Examples
These function is for 2D 0/1 image matrix and returns its border
1 | my.border(x, r = 1)
|
x |
is a 0/1 matrix. |
r |
is a positive real value of width to measure circumference. |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | library(igraph)
n <- 2^8
x <- y <- 1:n
xy <- as.matrix(expand.grid(x,y))
xy.val <- rep(0,length(xy[,1]))
n.circle <- 30
ctr <- matrix(sample(50:200,replace=TRUE,n.circle*2),ncol=2)
r <- sample(1:40,replace=TRUE,n.circle)
for(i in 1:n.circle){
tmp.x <- xy[,1] - ctr[i,1]
tmp.y <- xy[,2] - ctr[i,2]
s <- which(tmp.x^2+tmp.y^2 < r[i]^2)
xy.val[s] <- 1
}
xy.mat <- matrix(xy.val,ncol=n)
out <- my.border(xy.mat)
plot(out$border,type="l")
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