TABLE 3
Relevant GLCM Texture Features, Originally Described by Haralick et al. (10)
| Feature name | Formula |
| Contrast |  |
| Sum of squares: variance |  |
| Sum variance |  |
| Difference entropy |  |
θ) corresponds to entry in GLCM, designating probability of pixel with gray-level of i being distance d pixels away from neighboring pixel with gray-level of j in θ direction. In this study, we fixed d at 1 pixel and averaged over available directions for θ. Ng represents number of gray levels. x and y are row and column indices of GLCM, and is probability of 2 indices summing to , whereas is probability that difference 2 indices is ; μ is mean of p.
