Figure 3.

Use of features for each fold, with and without the features of size available to the linear discriminant analysis classifier algorithm for feature selection. The number in each square indicates for a given fold how many features from the associated category were selected for classification. The feature of irregularity was selected in 9 of 10 folds when feature selection drew from all features, including those describing size; the feature of irregularity was chosen in all folds when features describing size were excluded from feature selection.