Description Usage Arguments Details Value Author(s) References See Also Examples
calculates ENTROPY measure for Grey Level Co-occurrence Matrices
1 | calcENT(rawmat)
|
rawmat |
assigns the GLC-Matrix |
Entropy is a texture measure related to the orderline group. Entropy characterizes 'energy' values for pixel combinations.
returns Entropy value
H.-J. Klemmt
Toennies, D., 2005: Grundlagen der Bildverarbeitung. 341 S., Pearson Studium Harralick, R.M., Shanmugam, K., Dinstein, I., 1973: Textural Features for image classification. IEEE Transactions on Systems, Man and Cybernetics, SMC vol. 3 no. 6, pp. 610-620.
The GLCM Tutorial by Myrka Hall-Beyer, http://www.fp.ucalgary.ca/mhallbey/oderlines_group.htm
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | data<-c(0,0,1,1,0,0,1,1,0,2,2,2,2,2,3,3)
mat<-matrix(data, nrow=4, byrow=TRUE)
(mat)
GLCM<-genGLCM(2,1,mat)
(GLCM)
(calcENT(GLCM))
##-- ==> Define data, use random,
##-- or do help(data=index) for the standard data sets.
## The function is currently defined as
function (rawmat)
{
lnrawmat <- log(rawmat)
size <- dim(lnrawmat)[1]
for (i in 1:size) {
for (a in 1:size) {
if (lnrawmat[a, i] == "-Inf") {
lnrawmat[a, i] <- 0
}
}
}
return(sum(rawmat * lnrawmat))
}
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