Quality grading of cork planks with classification models based on defect characterisation

Coroebus undatus

(F.) and Crematogaster scutellaris Ol.). A discriminant analysis was used to construct the classification model: the variable with the highest discriminant power was the total porosity in the transverse section, and the other variables were transformations of the specific width in the tangential section and the aspect ratio in the transverse section. The model classified two thirds of the samples in accordance with the manual classification currently used in the industry and all cases of disagreement referred to changes between contiguous quality classes.