Table 1 Texture parameters used in the study.
Parameters | Description |
|---|---|
Angular second moment | Measurement of the distribution (uniformity) of the gray-level image values. Images with low gray levels have more uniformity |
Contrast | Amount of local variation in the gray levels. Higher levels of this parameter can indicate presence of edges, noises or streaks in the mage |
Correlation | Measurement of the linear dependence of the gray levels between neighbor pixels, thus providing a measurement similar to that of self-correction methods |
Sum of squares | Measurement of the dispersion of gray levels (variance) regarding the average |
Inverse difference moment | Measurement of the smoothness (homogeneity) in the distribution of gray-level image values. If the value of contrast is low, then the inverse difference moment is high |
Entropy | Measurement of the disorder degree between the pixels in the image, being the inverse of the angular second moment. Images with higher amount of gray levels have greater entropy |
Sum of entropy | Measurement of the disorder degree related to the distribution of the sum of gray-level image values |
