Table 4. Optimal feature set obtained from wrapper-based feature selection.

Feature type	SVM	ANN
Shape-based Histogram-based	None Histogram2D_skewness	None Histogram2D_skewness
Texture-based	GLCM3D_Correlation	GLCM3D_Entropy GLSZD3D_LZE GLSZD3D_SZHGE
Transform-based	Gabor_MSA-11, -22, -32, -37, -42, -44,-55	Gabor_MSA-42, -55 Gabor_MSE-26

SVM, support vector machine; ANN, artificial neural network.