calcCON: CON Contrast
In RTextureMetrics: Functions for calculation of texture metrics for Grey Level Co-occurrence Matrices

Description Usage Arguments Details Value Author(s) References See Also Examples

View source: R/calcCON.R

calculates CONTRAST measure for Grey-Level Co-occurrence Matrices

1	calcCON(rawmat)

rawmat

assigns Grey Level Co-occurrence Matrix for calculation of CONTRAST measure

CONTRAST measure belongs to the Contrast group of texture metrics. CONTRAST measure is also called sum of square variances

returns CONTRAST measure

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 Mryka Hall-Beyer, http://www.fp.ucalgary.ca/mhallbey/contrast.htm

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)
(calcCON(GLCM))
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.

## The function is currently defined as
function (rawmat) 
{
    size <- dim(rawmat)[1]
    matconweights <- matrix(0, nrow = size, ncol = size)
    for (i in 1:size) {
        for (a in 1:size) {
            matconweights[i, a] <- (a - i)^2
        }
    }
    con <- rawmat * matconweights
    return(sum(con))
  }