“…Table 4 lists the average classification accuracy among the five subjects obtained from LOOCV evaluation. Some state-of-the-art methods use handcrafted features based on prior knowledge [2-7, 9, 11, 14, 16, 19, 22, 24] while others automatically learn discriminative descriptors [21,27,28,32,35,36]. The proposed DDaNet outperforms the other methods in terms of accuracy (93.53%), demonstrating the benefits of learning discriminative features related to letter signs through a deep neural network with an attention module.…”