Linear discriminant analysis: Classification of on-surface and in-air handwriting

In this paper, we present the methodology for evaluation of kinematic parameters obtained from on-surface and in-air handwriting movements by implementing the information theory and the multi-class linear discriminant analysis. The study included 41 healthy subjects which task was to write on the digitalized tablet. Results of handwriting the two words in Serbian Latin alphabet (Tia řolaj) suggest that kinematic features obtained from in-air trajectories is as important as handwriting features obtained from on-surface trajectories for handwriting classification.